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Nursing school was hard. Absolutely soul-crushing and dream killing kind of hard. Harua is barely in his second semester of freshman year of Nursing school and he has already thought of dropping out and accepting the fact that he’s probably never going to work and just die alone and hungry multiple times. It could probably land him in a psych ward if anyone hears it out loud.
The workload is insane, the pressure is high, and the classes are absolutely crazy. Biochemistry? Hate it. Nursing theories? Boring.
Anatomy and Physiology seems to be the only class Harua goes to that doesn’t want to make him jump off a cliff because Harua absolutely loves the human body.
And also for the fact that the teacher of said class is hotter than every man Harua has ever seen in his life.
Mr. Murata Fuma. oh boy what is there not to swoon about him? He has everything! A nursing and a Biology degree! An absolute face card that cancels out even the hottest of celebrities! A body clearly so muscular and well built under his fancy clothes it would seem like the Gods chiseled his body by their own hands.
And worse of all? Mr. Murata is very very kind. An absolute gentleman.
Harua would be lying if he said he doesn’t have a big fat crush on his Anatomy and Physiology teacher who smiles brightly at him whenever he goes into the room.
“Good Morning, Mr. Shigeta,” the older man beams as Harua walks in, “you look happy today don’t you?”
“What can I say, Mr. Murata. My daily horoscope tells me today would be a good day for me—I didn’t even have to wait long for the bus to arrive today!” Harua responds joyfully as ever.
“That's good to hear. I hope your day gets better.” Fuma gives the younger boy one last smile before he gestures for him to settle down.
The rest of the class slowly fills in and Fuma greets every student with a smile. By the time the bell chimes right on time, Fuma tells everyone to settle down and he closes the door and locks it.
Locks it?”
Harua doesn’t get to dwell on it further as Fuma’s voice booms through the room.
“Good day everyone! I hope you’re all settled in and ready for today’s lecture." He heads on over to the table in middle and opens up a folder, “Alright, as per usual, let’s start with the attendance. Raise your hands and say ‘Present’ once your name is called, okay? Good.”
Fuma calls the students out one by one, waiting for their response before moving on to the next. By the time the last student is called Harua’s excitement for the day’s topic gets bigger.
“Well that’s interesting.” Fuma speaks up, “the girls aren’t here today?” he asks the class.
A student raises his hand, “Ms. Miyaki is absent today, Mr. Murata! She’s didn’t feel good this morning so the nurses told her to go home for the day.”
“Aaaah, I see.” Fuma lets out an understanding hum, “how about the rest of the girls? Does anyone know why they aren’t here?”
The classroom fills with murmurs and hushed conversations, students asking other students if they know a thing or two, only to be met by shrugs and “i don’t knows’
“Alright then. I guess it's just us boys for today.” Fuma smirks, "Let me know who your secretary is so I can give them a copy of today’s lecture so they could forward it to the girls so they don't miss out on anything, Alright?”
The boys chorus a quick “yes sir” much to Fuma’s delight. He starts setting up his laptop, taking out the projector’s wires and connecting it. Harua watches in awe as Fuma waits for the projector to boot up his presentation, walking over the windows to close the blinds one by one as he speaks up,
“Today's lecture will be different from the rest of the ones we have done so far.”
The last window blind is closed, leaving the classroom into a comforting dim atmosphere. Not too bright to highlight everything and not too dark to leave the boys sightless. Just enough to see what needs to be seen.
Fuma walks back to his table in front and faces the class, “For today’s lecture im going to need a volunteer. Is anyone willing to volunteer themselves as tribute?” He jokes lightly which makes the class giggle. Yet the air in the classroom hung heavy with hesitation.
Mr. Murata Fuma stood at the front, rolling up his sleeves with purpose, clipboard in hand, eyes scanning the rows of students with that familiar mix of mischief and patience. “No one?,” he asks, his voice smooth but commanding, “I need one volunteer. Just one brave soul.”
Chairs creaked. A cough somewhere near the back. Several students looked down at their desks as if suddenly fascinated by the grain in the wood. No one moved.
Except Harua.
He was still at first, almost statuesque. But inside, his pulse ticked faster—not out of dread, but from the quiet thrill curling in his chest. He tried to suppress the upward tug of a grin forming at the corners of his lips. He liked this kind of thing. A chance to do something unexpected. A little spotlight, a little chaos. And besides, it was Mr. Murata. Who could resist that energy?
He raised his hand. Slowly. Casually. Like he didn’t care much either way.
Fuma’s gaze landed on him instantly, a small smirk playing across his features. “Harua,” he said, drawing out the name like a secret he already knew, “I knew I could trust you Mr. Shigeta.
Harua shrugged, but couldn’t keep the smile from breaking through anymore. “Figured someone had to.”
Mr. Murata laughed softly. “Come on up. Everyone please give Mr. Shigeta a round of applause for his bravery.”
The class erupts into applause as walks up right beside his teacher, his large hand finding home right on Harua’s shoulder like a father showing off a son he is so proud of. Fuma gives his shoulder a quick squeeze and Harua is certain he sees stars right after that. The absolute size difference between him and Fuma sends shivers down his spine. Everyone knows Harua is on the smaller side of the tallness spectrum and it hasn’t bothered him ever since—but now he stands beside his absolutely hot teacher who towers over him and he’s vibrating inside like crazy.
“Now, before we start our class I would like to say a few important things.” Fuma speaks up, his voice laced with something much more serious than his usual bright demeanor, “As part of your curriculum we are discussing every organ system in the human body. We’ve discussed the skeletal system and all up to the endocrine system which we discussed last week.”
“For today’s discussion however, I would like everyone to take this into a purely educational and professional demeanor.”
Harua tilted his head slightly. A brief flicker of confusion passed through his eyes from the way Mr. Murata spoke, the phrasing was vague, but the atmosphere had shifted—sharpened.
“Today’s topic would be the Reproductive System—more specifically—” Right then, the projector finally shines brightly and right there on display are the words that confirms Harua’s greatest fears.
In the most formal looking presentation title page known to man, wrote nothing but the words that confirms Harua’s greatest fears.
“Human Arousal and Sexual Intercourse.”
Huh?
HUH?!
Harua froze. His breath caught, and for a split second, his confident front wavered. His mind scrambled for a neutral facial expression, but the shock hit hard, blooming up from his chest to the tips of his ears like a slow, creeping blush.
The speed at which Harua whips his head to stare wide-eyed at Fuma was strong enough to give him whiplash.
“W–what?” he squeaks out, only to be ignored by Fuma.
“Just like I said. I need everyone to approach the topic for today with nothing but maturity and seriousness.” Fuma’s hand heavily resting on Harua’s shoulder lifts up and pats his shoulder, “with that being said, Since Mr. Shigeta has bravely volunteered himself for today’s lecture. I would like you all to treat him with respect and professionalism. Anyone who laughs or even shows a sliver of unprofessionalism would be written up and automatically fail this class. Am I understood?”
The class erupts in hesitant agreement.
Fuma smirks,”Alright. Let's begin today’s lecture.”
Fuma removes himself from Harua’s side in leu to click his presentation to the next slide giving Harua time to release the breath he never knew he was holding back. Yet all it was short lived when the older man stands back behind Harua, his towering figure raiding heat that makes the hair’s in Harua’s body stand.
Fuma circled Harua, his gaze appraising the young man's form. "As you can see," he began, "the human body is a canvas of erogenous zones, each waiting to be explored and stimulated.The body is filled with thousands if not millions of receptor sites that react to multitude of stimulation. The skin is a very good example for this since its covered in huge amounts of nerve endings,
He traced a finger along Harua's neck, every inch it moves slowly down towards his collarbone, eliciting a shiver from the young man. "The neck and collarbone," Fuma explained, "is a sensitive area that can be teased and caressed to heighten arousal for both men and women. You can use your finger to elicit these arousal but it is often preferred to use your lips or tongue.”
Without a warning, Fuma leans over from behind him and drags his lips down Harua’s neck, his warm breath ghosting over the young man’s skin it makes Harua sigh and shut his eyes in arousal. The older man takes his time kissing and dragging over the sensitive skin.
Fuma continued his exploration, he moved to Harua's body. “The abdomen and chest is also one of the erogenous zones of the human body.” Fuma’s hands slowly reach down and crawl underneath Harua’s shirt, his fingers tracing the lines of his toned muscles, dipping into the hollows of his hips making Harua bite his tongue to hold out a moan from escaping him.
“Since it is not always we feel direct touches to our abdomen and chest, it leaves great stimulation and pleasure if done correctly by a partner.”
Fuma never stops. His hands continue to torture the boy. Harua shivered, his skin prickling with goosebumps at Fuma's sensual touch. Fuma smiled, his eyes dark with arousal as he watched Harua's reactions.
Next, Fuma moved to Harua's chest, his hands slowly dragging up the skin up to the chest, Harua’s shirt getting dragged up as well, exposing his bare abdomen and chest for the whole class to see. Fuma doesn’t stop, his palms flattening against Harua’s pecs and giving it a quick squeeze. Harua gasped his body responding to the sensual touch.
"The nipples are another erogenous zone, sensitive to touch and temperature." He circled Harua's nipples with his thumbs, the sensitive buds hardening under his touch. Harua gasped, his back arching off the older man’s body as Fuma teased him.
"Note how the nipples are a particularly sensitive area," Fuma said, his voice low and sensual. "Stimulating them can bring a great deal of pleasure to your partner. Especially if you use your mouth.”
One of Fuma's hands stops toying with Harua’s nipple for a moment as the older man brings it up to his own mouth and licks a fat stripe of saliva onto it and without warning slaps the wet finger right back on. Harua whimpers and his knees almost buckle from the new sensation. Fuma plays with Harua’s nipple harder with his wet finger, flicking, pinching, and twisting the sensitive buds like it was nothing.
Fuma manhandles Harua—whose eyes are still closed and mouth apart in a moan from the stimulation—to turn and face him slightly, just enough for Fuma to bend down a bit and dive right in to suck a nipple into his mouth. Lapping and sucking on it like a madman—dragging out whimpers from the poor boy.
Eventually he stops and lets go of the nipple with a pop, a string of saliva still connecting it.
“For the next part, please remove your clothes, Mr. Shigeta.”
Harua hesitated for a moment, his heart pounding in his chest, shame and embarrassment creeping in his body in a flush of red. His mind screaming no but his body betrays him—this is the most pleasure he has ever felt before; and his body wants more. He removes his clothing, shakily shrugging his shirt off revealing his lithe, toned body to the eager eyes of his classmates.
“I need you to remove everything. Mr. Shigeta.”
The younger boy’s fingers hesitate right at the waistband of his jeans, looking up at Fuma with blissed out yet hesitant eyes. Fuma licks his lips.
“Everything. Mr. Shigeta.” he says with finality—voice deep and commanding that makes Harua shake.
Harua has no choice. He unbuckles his pants and drags them down along with his underwear until they both pool right at his ankles. Harua’s hard cock now fully on display for everyone to see. Harua has the sense to cover up but it turns futile as Fuma circles back behind him and whispers in his ear, “Don’t be shy.”
As Fuma's hand grazed Harua's inner thigh, the young man felt his cock twitch and harden, rising to attention. Fuma took note of this, a smirk playing on his lips. "Ah, yes, the male anatomy is a fascinating subject," he said, his hand wrapping around Harua's erect shaft.
He began to stroke the young man's cock, his grip firm and assured. "The penis is a complex organ, with thousands of nerve endings that are sensitive to touch and stimulation." Harua moaned, his hips bucking involuntarily as Fuma continued his sensual ministrations.
"As you can see," Fuma continued, his voice low and seductive, "the glans, or head of the penis, is particularly sensitive." He ran his thumb over the slit, gathering the bead of precum that had formed there. "This fluid, known as pre-ejaculate, serves to lubricate the urethra and neutralize any residual acidity from urine."
Harua was panting now, his body trembling with desire. Fuma's hand continued to work his cock, the sensations building to a crescendo. "The shaft of the penis is composed of spongy tissue that fills with blood during arousal, causing it to become erect," Fuma explained, his hand moving faster now.
Harua's moans grew louder, his hips thrusting in time with Fuma's strokes. "As arousal builds," Fuma continued, "the scrotum tightens, drawing the testicles closer to the body in preparation for orgasm."
Just as Harua felt his climax approaching, Fuma released his cock, leaving him teetering on the edge of release. Harua stood there, his chest heaving, his body aching with unfulfilled desire. The class stared in rapt attention, their own bodies responding to the erotic display before them.
"Harua, please bend over and place your hands on the desk," Fuma instructed, his voice firm and commanding. Harua, still reeling from the intense stimulation, complied without hesitation, his body bent at the waist, his ass exposed to the class.
Fuma moved behind Harua, his fingers trailing along the curve of his spine. "The human body is a wonderland of erogenous zones," he said, his voice low and seductive. "And one of the most powerful sources of pleasure for those with prostates is the prostate gland itself."
He ran a finger along Harua's crack, teasing the tight ring of muscle that guarded his entrance. "The prostate gland is a small, walnut-sized organ located just below the bladder and in front of the rectum," Fuma explained, his finger circling Harua's hole.
"It plays a crucial role in male sexual function, producing the fluid that nourishes and protects sperm," Fuma continued, his finger applying gentle pressure to Harua's entrance. "But it is also a source of intense pleasure when stimulated."
With that, Fuma slid his finger past the tight ring of muscle, breaching Harua's hole and sinking deep into his velvet heat. Harua gasped, his body trembling at the invasion, but he made no move to pull away.
"As you can see," Fuma said, his finger moving in and out of Harua's hole, "the prostate gland is located just a few inches inside the rectum, along the front wall." He crooked his finger, rubbing against the spongy gland, eliciting a deep moan from Harua.
"Stimulation of the prostate can lead to intense orgasms, often more powerful than those achieved through penile stimulation alone," Fuma explained, his finger working Harua's prostate with expert precision.
Harua was panting now, his hips bucking against Fuma's hand as he sought more of the delicious friction. Fuma obliged, adding a second finger, stretching Harua's hole as he continued to massage his prostate.
"The prostate gland is often referred to as the 'male G-spot,' due to its ability to produce intense pleasure and orgasms," Fuma said, his fingers pumping in and out of Harua's hole, the wet sounds of his fingers fucking filling the room.
Harua was lost in a sea of sensation, his body trembling, his cock leaking precum onto the floor beneath him. Fuma continued his sensual torture, fucking Harua's ass with his fingers as he lectured on the intricacies of prostate stimulation.
"As orgasm approaches," Fuma said, his voice strained with arousal, "the prostate gland swells and becomes even more sensitive." He rubbed Harua's prostate harder, feeling the gland swell beneath his fingertips.
Harua was moaning loudly now, his hips bucking wildly as he sought the release that had been denied him earlier. Fuma could sense his impending orgasm, could feel it building in the tension of his muscles and the fluttering of his hole around his fingers.
With one final rub of Harua's prostate, Fuma sent him tumbling over the edge into ecstasy. Harua came with a shout, his ass clenching around Fuma's fingers as his cock pulsed and spilled its load onto the floor beneath him.
Fuma held Harua through his orgasm, his fingers still buried deep in his ass, until the last shudder had passed. Then, slowly, he withdrew his fingers, leaving Harua gasping and spent, his body draped over the desk.
As the class recovered from the erotic display of Harua's prostate orgasm, a student hesitantly raised their hand. Fuma, ever the attentive teacher, called on them. "Yes? You have a question?"
The student cleared their throat, their face flushed with embarrassment. "Um, I was wondering about penis length. Is there an average size? And does it matter?"
Fuma smiled, his eyes twinkling with amusement. "An excellent question," he said, clasping his hands behind his back. "Penis length is a topic that many people are curious about, and it's one that is often surrounded by myth and misconception."
He paused for a moment, considering his next move. "In the interest of education, I believe a visual demonstration is in order." He retrieved a measuring tape from his desk, the winding piece of plastic taunting.
Fuma turned to the class, his gaze sweeping over the students. "I will need two volunteers to join Harua at the front of the class." Two boys hesitantly raised their hands, their faces a mixture of nervousness and excitement.
Fuma motioned for them to join Harua, who was still recovering from his intense orgasm. The two boys made their way to the front of the class, their eyes wide with anticipation.
"Alright, gentlemen," Fuma said, handing each of them the measuring tape. "I want you to measure your erect penises and report the length to the class." The boys blushed, but nodded, their hands shaking slightly as they took the measuring tapes.
Harua, already naked and still semi-hard from his earlier stimulation, took the measuring tape and wrapped it around his cock, noting the measurement. The other two boys stripped off their clothes, revealing their own hardened cocks, and followed suit.
As expected, all three boys had different measurements. Harua's cock was 6 inches long, while one of the other boys measured in at 5 inches, and the other at 7 inches.
Fuma nodded, a smile playing on his lips. "As you can see, penis length varies from person to person. The average length of an erect penis is around 5 to 6 inches, but there is a wide range of normal.
He turned to the class, his voice taking on a more serious tone. "It's important to remember that penis length is not an indicator of sexual prowess or masculinity. What matters most is how you use what you have."
Fuma gestured to the three boys, their erect cocks still on display. "These young men, despite their differences in length, are all capable of providing and receiving pleasure. The key is communication, experimentation, and a willingness to explore."
He smiled, his eyes twinkling with mischief. "And of course, as we've seen today, there are many other erogenous zones and sources of pleasure beyond just the penis."
The class nodded, absorbing Fuma's words, their eyes still fixed on the three erect cocks before them. Fuma dismissed the volunteers, allowing them to dress and return to their seats.
As the volunteers returned to their seats, Fuma turned to Harua, who was still standing at the front of the class, his semi-hard cock on display. But before he could dismiss him, a playful student called out from the back of the room.
"Hey, Professor Fuma, how big is your cock?" The class erupted in laughter, and Fuma couldn't help but chuckle at the boldness of the question.
"Ah, ah, that would be private information," he said, wagging his finger at the student. But the class wasn't satisfied with that answer. They joined in, egging Fuma on, using the guise of visual learning to convince him to reveal his manhood.
“Come on Mr. Murata! We showed our own! It’s not fair!”
“You always told us visual learning is good! Show us!”
“Were all boys here anyways, Mr. Murata!”
Fuma could only laugh, shaking his head in amusement. "Alright, alright," he relented, his hands moving to his zipper. "In the name of education, I suppose I can indulge your curiosity."
He unzipped his pants, reaching in to pull out his flaccid cock. The class leaned forward, their eyes wide with anticipation. Even in its soft state, Fuma's cock was impressive, hanging thick and heavy between his legs.
Fuma motioned for Harua to approach, the measuring tape still in his hand. "Mr. Shigeta, would you like to help me measure and show the class?" he said, his voice tinged with amusement.
Harua nodded, his hands trembling slightly as he approached his teacher. He wrapped the measuring tape around Fuma's flaccid cock, noting the measurement. The class let out a collective gasp as Harua announced the length.
“Eleven inches," Harua said, his voice barely above a whisper. The class erupted in a chorus of "wows" and "holy shits," their eyes fixed on Fuma's impressive manhood.
Fuma chuckled, with his cock still hanging out of his pants, took the opportunity to proceed to the next topic of the lesson: penetration. He cleared his throat, commanding the attention of the class once more.
"As we move on to the topic of penetration," he began, "it's important to understand that this act is one of the most intimate and pleasurable experiences two people can share."
“P-penetration?” Harua asks, hesitantly. Surely his teacher won’t penetrate him…right?
“You heard it right.” He gives Harua a big smile as if his monster cock isn’t just hanging right in front of Harua’s face. “Penetration is part of Human Sexual Intercourse so I must include it in my lecture.”
He looked around the room, making eye contact with each student. "Would anyone like a demonstration of proper penetration techniques?" The class erupted in a chorus of enthusiastic agreement, their eyes fixed on Fuma's exposed cock.
"Very well," Fuma laughed, a mischievous glint in his eye. “if you would be so kind as to assist me in this demonstration, Mr. Shigeta.”
Harua, still flushed from his earlier experiences, nodded and approached Fuma, his eyes fixed on his teacher's cock. Fuma turned to the class, his voice taking on a more instructional tone.
"In order for penetration to occur," he explained, "the cock must be erect. There are many ways to achieve this state, one of which is through manual stimulation, or 'handjobs' as they are commonly known."
He motioned for Harua to stand beside him, "Mr. Shigeta” will now demonstrate the proper technique for giving a handjob, using my cock as the example."
Harua, his hands trembling slightly, reached out and grasped Fuma's cock, his fingers wrapping around the soft flesh. Fuma nodded approvingly, his eyes fixed on Harua's movements.
"As you can see," Fuma said, his voice slightly strained as Harua began to stroke his cock, "the key to a good handjob is a firm grip and steady strokes. The pad of the thumb can be used to apply extra pressure to the sensitive underside of the cock."
As Harua continued to stroke Fuma's cock, he tries his best to follow what Fuma did to him earlier. Using his fingers well and tight around the shaft—he even tries playing with the slit of Fuma’s large cock. He keeps jerking his teacher for minutes trying to get him hard like Fuma wanted—only to be met by nothing but a still flaccid cock.
Fuma looked down at his cock, still soft in Harua's hand despite the skilled ministrations. He smiled, unfazed by his flaccid state. "As you can see, sometimes manual stimulation alone may not be enough to achieve an erection. In such cases, other techniques can be employed. One such technique is oral stimulation, or 'blowjobs' as they are commonly known."
He guided Harua's hand away from his cock, and motioned for him to kneel, "Harua, if you would be so kind as to demonstrate the proper technique for giving a blowjob."
Harua nodded, his eyes fixed on Fuma's cock. He leaned forward, his lips parted, and took Fuma's soft cock into his mouth. Fuma hummed in approval, his eyes fixed on Harua's bobbing head.
"The key to a good blowjob," he said, his voice tight with arousal, "is to use both your mouth and your tongue. Create suction with your cheeks, and use your tongue to tease and caress the sensitive underside of the cock."
As Harua worked Fuma's cock with his mouth, it began to respond, swelling and hardening against his tongue. Fuma's breathing grew ragged, his hips twitching with the effort to remain still.
"Good," Fuma said, his voice strained. "Just like that. Use your hand to stroke the base of the cock, in tandem with your mouth."
Harua followed Fuma's instructions, his hand wrapping around the base of Fuma's cock, stroking in time with his bobbing head. Fuma's cock continued to grow, reaching an impressive size even in its half-hard state.
Measure it," Fuma commanded, his voice tight with arousal. "I want the class to see the difference in size when fully erect."
Harua released Fuma's cock with a lewd pop, reaching for the measuring tape. He wrapped it around Fuma's now mostly-hard cock, his eyes widening at the measurement. "Thirteen inches," he announced, his voice breathless with awe.
The class murmured in appreciation, their eyes fixed on Fuma's impressive erection. Fuma smiled, pleased with the results. "As you can see," he said, his voice strained, "the size of a cock can change significantly when fully erect."
He turned to Harua once more, his hand stroking his cock. "Now, let's move on to the next technique: deepthroating. This is an advanced technique, and should only be attempted with great care and communication between partners."
Fuma guided Harua's mouth back to his cock, his hand tangling in his hair. "Relax your throat," he instructed, his voice low and sensual. "Breathe through your nose, and take your time."
With that, Fuma began to fuck Harua's throat, his cock sinking deep into the tight heat. Harua gagged, his throat convulsing around Fuma's cock, but Fuma held him in place, his hips thrusting slowly but steadily.
"As you can see," Fuma said, his voice strained with the effort to speak, "deepthroating can be intensely pleasurable for both partners. The feeling of a tight throat around a cock is unparalleled."
He continued to fuck Harua's throat, the bulge of his cock visible in Harua's throat with every thrust. The class watched in awe, their eyes fixed on the erotic display before them.
And so the lesson continued, a demonstration of the power of the mouth in the art of pleasure. Fuma and Harua showed the class the many ways in which a cock could be pleasured. Harua too deep into pleasure trying to please his teacher, his own cock hard again and leaking on the floor where he knelt.
Fuma pulled his cock from Harua's throat with a lewd pop, his eyes fixed on the class. "And now," he said, his voice rough with arousal, "we come to the final lesson of the day: anal penetration and prostate stimulation."
He looked around the room, his eyes making contact with each student. "Are you ready for this demonstration?" The class cheered, their voices rising in a chorus of eager anticipation.
Fuma laughed, the sound low and sensual. "Very well," he said, turning to Harua once more. "Harua, if you would be so kind as to bend over the desk one last time."
Harua complied, his body trembling with anticipation. He bent over the desk, his ass presented to Fuma and the class. Fuma moved behind him, his erect cock in hand, poised at Harua's entrance.
"The key to pleasurable anal penetration," Fuma said, his voice low and instructional, "is proper preparation and communication. Make sure your partner is ready and willing, and use plenty of lubrication."
He reached out with his free hand, trailing a finger along Harua's crack, teasing his hole. "The prostate," he said, his voice low and sensual, “I have already discussed a earlier so I wont be diving further into it.”
With that, Fuma pressed the head of his cock against Harua's hole, applying gentle pressure. Harua moaned, his body relaxing as Fuma breached his entrance, sinking slowly into his tight heat.
And in one quick motion, Fuma's hips snapped forward, his cock sinking deep into Harua's ass in one smooth thrust. Harua's eyes rolled back in his head, his stomach bulging obscenely from the size of Fuma's cock. To the amazement of the class, Harua came without even touching himself, his cum splattering onto the desk below once again.
Fuma began to fuck Harua in earnest, his hips slamming against Harua's ass with every thrust. Harua moaned loudly, his body shaking with the force of Fuma's thrusts.
Harua gasped, his eyes rolling back in ecstasy as Fuma's thick, veiny shaft stretched him open. "Mmm, fuck, sir," he whimpered, his hands scrabbling for purchase on the desk.
"As you can see," Fuma said, his voice strained with the effort to speak, "anal penetration can be intensely pleasurable for both partners. The key is to find the right angle and depth to stimulate the prostate."
He adjusted his angle slightly, his cock rubbing against Harua's prostate with every thrust. Harua keened, his body convulsing with pleasure as Fuma fucked him.
Fuma continued to lecture, his voice punctuated by moans and grunts of pleasure, as he demonstrated the art of anal penetration to his captive audience. He spoke of angles and depths, of speed and rhythm, all while slamming his cock into Harua's willing ass.
Fuma's thrusts grew erratic, his breathing ragged as he neared his climax. "As we near the end of our demonstration," he said, his voice strained with the effort to speak, "I want to touch on the topic of climax."
He looked down at Harua, his eyes dark with lust. "The climax is the peak of pleasure, the moment when all the tension and arousal come to a head. It is characterized by intense sensation and, in the case of men, ejaculation."
Fuma's hips snapped forward, his cock sinking deep into Harua's ass. "When you feel your climax approaching," he said, his voice tight with impending release, "it's important to let your partner know. Communication is key, even in the heat of the moment."
With that, Fuma let out a guttural moan, his hips slamming against Harua's ass in one final, brutal thrust. His cock swelled inside Harua, pulsing as he came, filling Harua's ass with his cum.
"Ah, yes," Fuma moaned, his body shuddering with the force of his climax. "You see, class, how the body tenses and convulses with pleasure? How the cum spills forth, a testament to the intensity of the experience?"
He pulled back slightly, his cock slipping from Harua's ass with a lewd squelch. A torrent of cum followed, spilling from Harua's used hole and splattering onto the desk below.
"The climax is the ultimate goal of sex," Fuma said, his voice rough with satisfaction. "It is the release of all the tension and pleasure that has built up during the act. And, as you can see, it can be quite... messy."
The class stared in awe, their eyes fixed on the lewd display before them. The sight of Fuma's cum dripping from Harua's used hole was both shocking and arousing, a fitting end to the day's lesson.
And with that, the class came to an end. Fuma dismissed the students, their minds reeling with all they had learned. It had been a day of erotic education, a journey through the pleasures of the flesh. And as they filed out of the classroom, they knew they would never forget the lessons they had learned at the hands of Professor Fuma.
And for Harua? Maybe he liked Anatomy and Physiology even more than before.