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Osamu got flustered easily.
Well, not exactly easily. He could keep his stoic expression most of the time, only cracking when it came to his brother or friends. He never seemed interested in anything, the bored look on his face more common than anything else.
Rintarou couldn't remember when Osamu started turning red around him. It wasn't hard to notice the way he blushed when Rintarou slung an arm around him, the contrast of red face and grey hair making it stark. It was unbearably cute, and Rintarou craved more. He had always liked the grey-haired twin since they first spoke to each other, the cold look on his face was unusual compared to Atsumu's, piquing Rintarou's interest.
Flustering Osamu was way too easy. Sliding a hand into Osamu's own one while walking to their dorms, wrapping his arms around that tiny waist, taking a nap on Osamu's lap, soft lips brushing against Osamu's nape. Rintarou was driving Osamu crazy, and he was having the time of his life doing so. He already managed to get a few pictures of the grey-haired twin's flushed face, but he needed more.
Atsumu was gone for the U-19 camp, and for the first time in what felt like forever, Rintarou finally knew peace. No more glares from across the gym that made Rintarou want to hurl a volleyball at him. The best part, having Osamu’s attention solely on him for the next few days.
The two were in the twins’ dorm room, finishing up their homework. Rintarou was done for a while now, resting on Osamu’s bed as he watched the grey-haired boy frown at his papers. “Do you need any help?”
“From ya? No, I’m not tryin’ to fail.” An amused snort escaped Rintarou, looking back at his phone. It was almost nine in the night, and he didn’t feel like walking all the way back to his room.
“Hey, can I stay here tonight?” Osamu’s head jerked up, staring at Rintarou like a deer caught in the headlights. There was a pink hue colouring his cheeks already, and he didn’t reply. “Osamu?”
“Ah, uhm, yeah. Sure.” He turned back to his desk, face still red. Rintarou smirked to himself, burying into the sheets even more. It was best that he didn't distract Osamu while he’s trying to finish his work, he had plenty of time to do so later. Rintarou soon realised how hot it really was underneath the covers, so he shrugged off his hoodie, tossing it onto the ground as Osamu was fully concentrated.
It took Osamu half an hour to complete whatever he was doing. Rintarou was distracted with dumb cat videos, and it took a pillow to the face for him to look away from the screen. “Must ya take my bed-”
Osamu finally noticed the sweater on the ground, gaping slightly as a blush overtook his face again. Rintarou could never get enough of it. He waited for Osamu to speak, but no words came out of his mouth, eyes still fixated on Rintarou's body. “You’re staring.”
It filled Rintarou with mirth, watching Osamu jolt, looking away quickly as he stifled a pretty sound. He was almost surprised Osamu didn’t melt to the ground, eyes still averted as Rintarou sat up, reaching out to grab his wrist.
“Fuck, you are so cute.” The blush on Osamu’s face deepened as he was pulled onto the bed, nervously eyeing Rintarou as he placed his hands around Osamu’s waist. “Did I ever tell you how pretty you look when you’re this red?”
“What are ya doin’...” The whisper almost went unheard, Osamu’s usual volume lowered to a hush. His hands were now on Rintarou’s wrists, breath hitching.
Rintarou wanted to eat him up. Leaning forward to hover his lips above Osamu’s own, he murmured back, “Can I kiss you?”
“Y- Yeah.” Osamu shut his eyes tightly, lips slightly ajar. Rintarou’s stomach did backflips at the sight, moving to press their lips together, light and delicate, leaving as fast as it came. When Osamu didn’t jerk away, Rintarou kissed him again, slightly rougher this time. The moan that slipped out of Osamu’s mouth was muffled against closed lips, hands clutching at Rintarou’s biceps harshly. Rintarou prodded at Osamu’s lips with his tongue, successfully forcing it open to lick into every crevice he possibly could, intent on ruining Osamu.
It took a few minutes for Osamu to become a whimpering mess in his hands, breathless and dazed when Rintarou pulled away. Spit drooling from the corners of his mouth, staring at Rintarou blankly as he tried to catch his breath, it was too beautiful for Rintarou to handle.
“Hey, need me to stop for a bit?” Osamu looked way too out of it to speak, but Rintarou watched as his lips parted, tongue darting out for a moment before speaking.
“I’m fine.” His voice was still soft, but much hoarser than usual, a swell of pride emerged from Rintarou, knowing he was the reason that Osamu was wrecked.
He needed more from Osamu, and he was desperate for it. “Tell me when you want me to stop, alright?”
Without waiting for a reply, Rintarou sneaked a finger into the waistband of Osamu’s sweatpants, with his other hand feeling up Osamu from underneath his shirt. He listened for the pretty gasps each time he brushed over a sensitive area, toying with it until Osamu sobbed and whined beneath him.
One of his hands was now fully in Osamu’s sweatpants as Rintarou was playing with his chest. He reached to grab Osamu’s dick over his boxers, and fuck, he was soaking through them, wet and sloppy and Rintarou craved a taste. Osamu squeaked as Rintarou palmed him, cooperating as his pants were tugged down to his ankles in a flash.
“Fuck, ‘Samu, you’re so wet. Did you come yet?” Rintarou lowered himself right in front of Osamu’s crotch, tongue flicking out to sneak a taste over the cloth. Osamu tossed his head back, hand slapped across his mouth to suppress a moan.
“No- Ahh, fuck, no, I’m so close.” Osamu was so red, the embarrassment and nervousness spilling over his face as Rintarou chuckled, sucking him over his underwear, pressing kisses everywhere he could. “Please- Please touch me-”
“I am touching you, baby.” He accentuated his words with another stroke over the boxers, laughing at the mewl from Osamu as he jerked his hips against his face.
The desperation adorning Osamu’s face was a sight to behold, watching as he struggled to form coherent words with a mouth teasing his cock, blabbering away. “Take off my – fuck, Rin – boxers, please, please, please, I want- I need ya on me…”
A carnal desire washed over Rintarou, his own arousal becoming increasingly prominent. He tore off Osamu’s underwear, finally wrapping a hand over him. It was so slick, so wet, Rintarou was going insane with want at the way Osamu whimpered as his fingers slid up and down his cock. Tears were leaking out of the corners of his eyes, and Rintarou kissed them away, tasting the salt on his lips as he kept his hand moving. It didn’t take long for Osamu to spill all over Rintarou’s fist, hot, white spurts dirtying their clothing as Rintarou stroked him through his high.
It was the hottest fucking view that Rintarou has ever seen. Come painting Osamu’s chest, drool all over his chin, eyes glazed over as he panted, focused on Rintarou and Rintarou only. Scooping up some of the come from his fist with a finger, Rintarou pushed it into Osamu’s open mouth. Osamu swallowed, too gone to even notice as Rintarou kept feeding him his own fluids.
Rintarou’s neglected cock was still straining in his pants. Yanking off his own pants and boxers, he was about to quickly jerk himself off, but Osamu grabbed his hand before he could touch himself.
“Mnn, let me, please.” Osamu dropped forward to kiss the head of Rintarou’s dick apprehensively, eyes darting up for permission to continue. Rintarou was going to lose his composure if Osamu kept looking up towards him like that, eyes hooded and peeking through his eyelashes.
“Fuck, you’re so hot, babe.” Rintarou slid his hand through Osamu’s hair, brushing over the undercut and curling into the long strands. Osamu whined pitifully, before opening his mouth to take Rintarou’s cock. He tried pressing in further, gagging a little before pulling back with a pout.
Before Rintarou could tell him to not force himself, Osamu went down again, lips stretching over his dick, cheeks stuffed full. Rintarou had to stifle a groan at Osamu’s weak suckling, tongue swirling around as much as he possibly could.
“God, you’re gorgeous, fuck-” Osamu pulled away again, spit and precome messily spread across his lips and cheeks, eyes burning with lust at the sight of Rintarou’s dripping cock. A hand wrapped around the base as he placed kitten licks all over the tip, and Rintarou could feel the heat of his own orgasm impending in his abdomen, hips jerking into Osamu’s hand. “I’m coming, shit-”
White engulfed his vision, come shooting onto Osamu’s face, painting his face with his fluids. Osamu groaned, lapping up the rest of Rintarou’s come that was trickling out as he came down from his high.
Rintarou opened his eyes to see Osamu’s face splattered with a pale white, across a closed eye and his hair and all over his mouth. There was only one thing on his mind when Osamu stuck out his tongue, showing off the leftover come coating his tongue. “Where’s my phone?”
“Are ya fuckin’ serious?”
“Fuck yes, I am. I need a picture of you like this. You’re going to be in my wet dreams forever if you keep looking like that.” Rintarou stretched for his phone underneath the pillow, snapping a quick picture of Osamu’s come-covered face and red cheeks.
“Yer unbelievable.” He grumbled, though the colour dusting his face said otherwise. Licking his lips to bring the come into his mouth, he made a show of swallowing it for Rintarou, sticking his tongue out to show him when he was done.
Rintarou needed Osamu for the rest of his life if he was always this beautiful. “So, go again?”