Chapter Text
Huff... huff...
In a quiet bedroom, on an uneventful Saturday afternoon, a teenage boy sat on his bed in the throes of self-pleasure. Stroking his penis fiercely, staring at an assortment of beautiful women in his copy of Beach City Babes Vol. 4. He had been going for some time, enjoying a nice, slow edge for a while, before really getting into it. Now, his cock was pounding in his grip, dripping with precum that he used to lube himself up with each pump.
"Haah... f-fuck..."
His grip tightened as he quickened his pace, feeling an orgasm well up in the base of his shaft. He leaned forward, preparing to soak a page of his magazine in his sticky seed. Faster and faster he pumped, closer and closer he got to cumming. Closer... closer...
"Hey Steven! Whatcha up to?"
"AAH!"
The sound of a coarse female voice made Steven's entire body tense up, halting his orgasmic buildup and making him stop fapping immediately. He quickly surveyed the room to find Amethyst staring at him from across it, a small smirk on her face. With just as much haste, he pulled his bedsheets over his lower body, trying to hide his erection. His bulge was still very visible underneath them, but at this point, he knew it didn't matter either way.
"D-Don't sneak up on me like that, Amethyst!" Steven stammered, trying his best to preserve his dignity.
"Pff, I wasn't trying to sneak up on you, dude. You were just way too focused on doing that... thing you were doing," Amethyst said with a chuckle, pointing lazily at Steven's crotch. Steven blushed. Being caught in this situation would've been embarrassing for any teen, but somehow, Amethyst was making him feel even more awkward.
"Is a little privacy too much to ask for around here...?" Steven mumbled to himself, sighing.
"I can leave, if you really want me to. Was that a sex thing you were doing to yourself?" Amethyst asked, tilting her head.
"No, it's... Wait, you know what sex is?" Steven's attempt at clarifying himself immediately halted when he heard this. Amethyst knowing about sex was certainly surprising... though, perhaps not that surprising. Given her interest in other strictly-human activities, like eating and sleeping, the idea of her being promiscuous didn't seem out of place.
"Uhh, yeah, kinda!" Amethyst said, scratching her mane of unkempt lavender hair. "I know that it's how humans make more of themselves, and that it's supposed to be super fun to do. Never tried it, though," Amethyst admitted, wistfully.
"Connie and I were planning to go on a date tonight, but she had to call it off at the last minute, so..." Steven wasn't thrilled to be telling Amethyst about his latest romantic escapades. It had been a while since he had been able to get intimate with his girlfriend, and the pent-up emotion he had been feeling had made him very restless, in more ways than one.
"So since you couldn't have sex with her, you're trying to have sex with yourself?" Amethyst asked with a puzzled look.
"It's called masturbation, if you need to know, and I was a little busy with it. So, privacy, please," Steven said, now just wanting Amethyst to leave so he could get at least some relief today.
"Aww, sorry, dude. It sucks that Connie had to ditch you like that. I'll let you do what you gotta do..." Amethyst turned around, preparing to go downstairs. Before she took more than a single step, however, she paused, a sudden jolt of inspiration running through her. "Ooh, wait a second!" Amethyst spun around and ran up onto Steven's bed, sitting right next to him. "Steven, you could have sex with me instead!"
"What?! No!" Steven protested, pulling the blanket even tighter over his lap.
"Why not? I've never gotten to try it before, and it would probably be better than that 'master-bay-shun' thing you were gonna do," Amethyst reasoned.
"I-It'd be too weird! You're like my sister, Amethyst, I can't have sex with you," Steven argued back. His point just made Amethyst more puzzled.
"What's wrong with having sex with your sister?"
"Do you really want me to answer that...?" Steven rubbed his forehead, hoping that Amethyst wouldn't say yes.
"C'mon, dude, it's not a big deal. Pearl and Garnet aren't here, they don't need to know. It'll just be a fun thing between us..." As Amethyst said this, she drew closer to Steven, running one of her hands over his shoulder, making him blush almost invisibly. It was one thing for her to be promiscuous, that wouldn't have surprised him, but Steven hadn't expected Amethyst to also be... affectionate.
"Well, I'm not sure it would even work. I’m pretty sure Gems don’t have the right, uh, parts for sex..." Steven argued further.
"You mean one of these?" Grabbing Steven’s porno mag from across his lap, Amethyst flipped to a random page and pointed to the beckoning slit of the girl proudly spreading her legs on it.
“Hey, gimme that!” Steven said, snatching the magazine back just as quickly. “Yeah, one of those. A vagina, a pussy . You don’t have one of those between your legs… right?” Steven desperately hoped that the answer was no. Before speaking, Amethyst smirked at him.
“Hehe, not yet…” Amethyst closed her eyes, and a bright light began to radiate from the gem in her chest. This spread throughout her body, giving it a vibrant purple glow. Only a moment later, it dissipated, revealing the changes she had made to her form. Her loose outfit had disappeared completely, revealing her smooth, uniform body underneath. Her purple skin was mostly featureless throughout, save for a brand new feature near her crotch. In a rapid display of her shapeshifting powers, Amethyst had manifested a vagina. It was a similar purple color to the rest of her, but other than that, it looked identical to the nethers of a human woman.
“Woah! Check it out, dude! I made one!” Amethyst exclaimed, pointing to her newfound genitalia. She immediately began inspecting it, prodding and pulling at her labia. “Now how do these things work…?” she muttered to herself.
“Huh, that’s… kinda impressive, actually.” While Amethyst had shown off her shapeshifting abilities plenty of times, the fact that she had been able to replicate such a specific piece of human anatomy surprised Steven.
“Haha, awesome! Let’s do it! Let’s have sex!” Amethyst chirped eagerly, almost tackling Steven in her eagerness. Steven sighed lightly. Amethyst’s lack of experience would no doubt make this encounter extremely awkward, but it was still better than having no sex at all, especially with how pent-up he had gotten as a result of not seeing Connie.
“Hang on,” Steven said, pushing Amethyst away. “If we’re gonna try this, there’s something I want to do first…”
“Hmm? What’s that?”
Steven tapped his fingers together, unable to hide his blush. “Well, whenever I have sex with Connie, I always kiss her before we do anything else…”
Amethyst smirked, fluttering her eyes a little at Steven. “So… You wanna kiss me, dude?” she asked, slyly.
“If it’s okay with you…” Steven admitted.
“You’re in luck, that’s another thing I’ve always wanted to try doing,” Amethyst leaned in closer to Steven, puckering her plump lips and closing her eyes. “Gimme a smooch, dude~” she tempted. Steven hesitated for a moment, but then relented, leaning towards her as well. He puckered his own lips, and…
Mwah~
Normally, when Steven kissed Connie, the experience was nothing more than pleasant. A casual and fun peck between boyfriend and girlfriend that left the former smiling and the latter giggling. Here, though, Steven’s kiss with Amethyst had felt… euphoric. Energizing, even, like there were sparks jumping between their lips. Steven felt a rush of pleasure flow through his entire body as soon as his lips touched Amethyst’s, which lingered even after they pulled away.
“Woah…” Steven said, his body coursing with pleasurable sensations in the wake of the kiss. Most of these were concentrated in his groin, causing his softening cock to instantly become rock hard again, throbbing more ferociously than it had ever throbbed in his entire life. He quickly pulled the sheets over his crotch again to hide it, but the resulting tent was impossible to ignore. Amethyst, however, wasn’t focused on it at all.
“Y-You’re a pretty great kisser, dude…” Amethyst spoke with an eroticism that Steven had never heard in her voice before. As she opened her eyes, he saw that her pupils had taken on a bright pink glow, partially obscured beneath her half-lidded stare. Her gem glowed brightly yet again, triggering another change in her body. Steven watched in amazement as Amethyst rolled her hands over her chest, revealing a brand new pair of breasts. She cupped her pert mosquito bites as they swelled bigger and bigger, filling, then overfilling, her hands, until they were both more than half the size of her head. Her hands wandered lower, tracing over her hips and thighs as they thickened and widened. She lifted her rear off of the bed, rocking it back and forth as her ass bubbled out behind her. “Mmm… yeah…” Amethyst moaned, licking her lips as they too plumped up into a pair of dark purple cock pillows.
“A-Amethyst, your body…” Steven stammered, completely floored by her transformation. Just a moment ago, Amethyst had been nothing more than an overeager virgin, and now here she was, a shortstack porn goddess that was fluttering her eyes and licking her lips at him with ferocious seduction.
“I look pretty hot now, huh~?” Amethyst said, giggling to herself. As the glow in her gem faded, it applied the finishing touches, lengthening her eyelashes and embedding glossy purple makeup into her lips and eyelids. “C’mon, dude. Let’s fuck~”
The Amethyst Steven had known would’ve probably done nothing more than try to clumsily give him a handjob, but this Amethyst seemed to know exactly what she was doing. Taking advantage of Steven’s stunned state, she climbed over and straddled him, pressing the swell of her ass against his pounding erection. With a lewd smirk on her face, she pushed her hips backwards, engulfing his cock between her soft, smooth, and unbelievably bubbly butt cheeks. Once in position, she began to rock her hips from side to side, effortlessly making her cheeks jiggle.
“O-Oh fuck!” Steven cried, gripping his pillows as his libido suddenly spiked from seeing Amethyst’s clap cakes bouncing right in front of him. He had done dry-humping with Connie before, usually as just a fun warmup to their sexual encounters, but this was on a level his girlfriend would never be able to compare to. Amethyst was twerking her monstrously fat ass against his cock with a hypnotic rhythm, jiggling her cheeks in a way that even a rapper would call too lewd. This certainly wasn’t something Steven had expected Amethyst to know. He wasn’t even sure where these newfound skills had come from. However, that didn’t stop him from enjoying it.
SLAP!
Amethyst threw her hands against her cheeks, creating a resounding clap as she began to twerk them even faster. The sudden pressure made Steven grunt, his cock spraying precum all over her wobbling donk as he was brought right back to the edge of an orgasm. The cum he had been building up in his dateless afternoon masturbation session was still in him, now joined by an even bigger, thicker load as Amethyst’s bouncing booty made his balls churn and swell.
“Hehe, I can feel you throbbing between ‘em. Gonna cum already?” Amethyst teased, flashing him a smirk from her dolled-up face. Throwing her hips backward, she clapped her ass against Steven’s crotch, bouncing at least 50 pounds of perfect purple booty flesh on his cock. “Go ahead, fucking empty those balls all over my butt, dude~” The way Amethyst was speaking no longer made this seem like a casual encounter. There was a hunger, a lust in her voice that excited Steven just as much as it concerned him.
“O-Ooh, Amethyst, I think I-
SLAP!
“NNGH!”
Giving herself another sudden spank, Amethyst made her ass wobble around Steven’s dick so forcefully, his body had no choice but to make him orgasm instantly. He panted as he felt his cock pulsate with each thick rope of cum it released, splattering Amethyst’s back and pouring down onto her cheeks. She continued twerking even as he came, siphoning up more and more of his seed with each jiggle. By the time Steven’s cock actually stopped cumming, Amethyst’s back and ass were soaked in ivory stickiness. She swabbed up some of it with her fingers and gave it a taste, moaning with delight.
“Mmm, that was one huge mess you just made, Steven. Good thing Pearl isn’t around to see this, huh?” Amethyst teased, giving her booty one final wiggle before freeing Steven’s cock from it.
“W-Woah… Amethyst, that was… woah…” Steven lay back on his bed, totally blown away by the sheer sexual euphoria he had just experienced. He had never cum that hard when having sex with Connie, not even close. It was easily the best orgasm of his entire life. Amethyst didn’t let him rest for long, however. She quickly rotated herself and faced Steven, her huge tits now at eye level with him.
“Hehe, did you think we were already done? I’m gonna milk you, dude~” Amethyst growled, rubbing her puffy, soaking wet slit against Steven’s shaft. “You were saving all of this for Connie, and now I’m gonna get it all out of you.” She gave Steven’s balls a squeeze, pumping a few more drops of cum out of his shaft. While he was normally more of a one-and-done kinda guy in bed, Steven somehow felt his cock grow even harder after cumming all over Amethyst’s ass, something she was clearly looking to take advantage of.
Amethyst placed her hands on Steven’s shoulders and steadied herself, hoisting her hips upward and pushing herself down onto his shaft. As his cock slid into her perfectly-molded Gem pussy, Steven realized he was in for the ride of a lifetime. Amethyst bounced up and down, up and down, soon getting into a steady rhythm as she rode his cock. With how skillfully she moved, it was as if she had already done this hundreds of times. Based on the amount she was moaning, however, it was still clear as day that this was her very first sexual experience, and she loved it.
“A-Aah, mmf! Steven, you’re so big!” Amethyst cried, throwing her head back in bliss. Her tits bounced in sync with the rest of her body, making hypnotic, lewd circles that kept Steven transfixed.”Your cock is filling me up completely, dude! Look!” This comment made Steven pry his eyes off of Amethyst’s chest and look down at her abdomen, where he saw that his cock was making a sizable bulge in her relatively small frame. The sight of this just made him all the more horny.
“T-This feels fucking amazing, Amethyst!” Steven put his hands on Amethyst’s thick thighs, guiding her hips as she started to move faster and harder. His hips began to thrust against her movements, hammering her pussy with even more force. Ravenously horny and with her ass right in his grasp, Steven threw one of his hands against Amethyst’s bubble donk, giving it a smack that made her squeal with pleasure.
“Y-Yeah, smack my fat fucking ass, dude! It’s yours! I’m yours~!” Amethyst wailed, the pink glow in her eyes growing more vibrant and intense as she let his cock drill her. This was what brought him right to the edge. Amethyst was riding him with such intensity, such shameless, unbridled lust, the likes of which he had never seen in Connie. His girlfriend might’ve loved him, but Amethyst was surrendering to him, and right now, that made him want to cum as hard as he possibly could inside of her.
“NNNGH! YEAH! TAKE IT!” Steven roared, grabbing Amethyst’s hips and slamming them down onto his cock, driving it as deep as it could possibly go into her pussy. Amethyst screamed with pleasure, her body trembling with an orgasm that made her eyes glow with a radiant pink light. Her pussy clamped down on Steven’s cock in response, prompting his balls to unload inside of her instantly. Spewing more cum than he even thought he was capable of producing, Steven began to bloat Amethyst’s belly with his seed, her chubby shortstack body only able to hold so much of his load. Each spurt pushed her belly out bigger and bigger, until it was nearly the same size as her tits. Once Steven stopped cumming again, both of them were drooling, panting, pleasure-drugged messes.
“Ugggh, I feel like a balloon…” Amethyst groaned, clutching her cum-stuffed belly as she rolled off of Steven’s cock and onto her side.
“Heh, you look like one, too.” Steven prodded Amethyst’s belly, making wads of cum spurt out of her pussy. She moaned softly, climbing up towards him and grinding her warm, supple body against his. She planted kiss after kiss on his chest, his neck, and his face, leaving thick purple lipstick marks each time.
“See, Steven? You don’t need to jerk that fat dick of yours when you’ve got me to play with, instead~” Amethyst said, giving him a playful smile.
“After all of that, I don’t think fapping is gonna be enough for me, anymore,” Steven said, glancing at his softening, cum-stained cock. “Do you think we could do this again? Y’know, if I’m feeling really pent-up.”
“Oh, Steven, you don’t have to ask. I’ll be your sex toy any day~” Amethyst licked her lips again, creating an expression so erotic, Steven knew she couldn’t be lying.
“That sounds pretty good to me, then,” Steven replied smugly, smiling to himself as he laid back on his pillow. What he had just done was unquestionable: he had turned one of his best friends, a Gem he had known since childhood, into a shameless cock-addicted bimbo, and proceeded to fuck her raw, giving up any sexual sanctity between him and Connie. Normally, such a situation would make Steven very distressed, but as he lay on his bed, with a curvy cuddle-slut by his side, he didn’t feel distressed at all.
In fact, he felt pretty damn good.