"How about you age yourself? You know, I want to see how your current looks when you're older." You say as you're curious.
"Alright, how old do you want me, honey?" He asks, crossing his legs to hide his tenting erection.
"Age yourself to 18, give yourself some nice muscles and a deep voice, but please don't grow any hair on your body." You grab his ass, making him yelp in a cute way. "In fact, can you be androgynous with some nice curves too?"
"Jeez bro anything else with that order?" he jokes as he stands up. "Alright, let's make this fun while you're already naked." Your shapeshifting boy/girlfriend smiles as he comes closer with his young naked body.
"This'll be good, Teehee..." he says as he sits on your lap. He puts his arms around your neck, tilting his head back and gyrating his erect crotch against yours. you put your hands on his hips and enjoy the show. Your girlfriend, as a cute 10-year-old boy, closes his eyes and focuses, a cute smirk dresses his face.
First, you hear low cracking and squelching sounds as your girlfriend winces. You see mass rippling throughout his body, and his torso begins to stretch and expand. you feel muscle building up on his legs as they stretch out, his toes almost reaching the floor. His little erection begins to grow further, thickening and stretching to 8 inches, and his testicles develop into ping pong balls. You blush as you realise this now pubescent kid is more hung than you.
"Wow, I can't believe your dick is bigger than mine, babe." You say as you continue to feel his growing body.
"Well, you did say you wanted me to become a jock, right?" He grinds his meat against yours, smothering it as he bites his lip.
"I said musc-." You are interrupted by your girlfriend kissing you forcefully, sticking his tongue deep into your mouth. You feel his jawline bulk slightly, and his back becomes ripped. As you kiss, you hear his moans lower in register, becoming irresistibly boyish. He pulls back and you open your eyes, he continues gyrating his hips and he raises his arms up, his chest bulges out, mass depositing in his pecs and stomach, he looks down and chuckles at his hunky chest as you stare at his handsome frame.
"God, this feels good." He says in his new husky voice, he flexes his whole body, his pecs and 6 pack look very well developed and his arms begin to grow as well, you can't help but run your hands over his chest, his pecs are the size of c-cup boobs but are so dense and hard, you kiss his cute nipples, causing him to moan, he grabs your head, ruffling your hair like a big brother or uncle would as he holds your head against his hard body. "I love you, babe." he says softly, kissing your forehead. you feel his hands grow, and the force against your head increases as his arms develop into teen athletes.
He lets you go and you pull away to catch your breath, you see he now looks like the 16 year old version of the 10-year-old boy he was moments ago, you think that your shapeshifting girlfriend is probably the same weight as you now, maybe even slightly bigger, he certainly is much more in shape than you. "Wow, babe, you look so good." You say, blushing.
"I know, but I'm not done yet, though. I used my testicles to produce excess testosterone." He climbs off and stands in front of you, "That accelerated puberty and gave me enhanced male features, but to finish I will make my testicles produce estrogen, that should give me the androgynous look you want." he says in his deep voice. You stare at his erect rod as his balls shift around inside him, he grunts deeply, stumbling back into the dresser.
"Babe, you okay?" You ask,
"Yeah, god, this feels so good." he replies.
Your shapeshifting boyfriend/girlfriend turns around, leaning against the dresser, displaying his muscular ass to you. "Watch this" he says, his hips crack loudly, causing him to moan in a mix of pain and pleasure as they widen significantly, he shakes them from side to side, causing his butt to jiggle slightly more and more as mass begins building up in his rear. his thighs and legs also thicken, with fat building on top of his muscular frame. He grabs his cheeks and squeezes them, showing their juicy firmness. He is left with an ass that would make even grown women jealous and a pair of thick, well worked thighs. He turns back to face you, strutting towards you in a sultry manner as his cock and butt wobble, he grabs your boxers and in one swipe rips them clean off you with his ripped arms, next he clambers on top of you, guiding your erect cock to his virgin butthole. "Mmmmmm," he moans deeply as he pushes his asshole down onto you, eveloping your dick in his fat booty, you gasp as he begins riding you.
"Mmm... fuck... this feels..." You grunt, you grab his waist and set him down onto his back, pumping your dick into him all the while. You get to your feet and move his legs so that they hang up over your shoulders as you fuck your boyfriend with hard thrusts, his erection splays over his 6-pack, his balls pulsing every time you push into him. you grip the side of his ass and give his thick rear a slap, causing him to moan in a slightly lighter voice, you notice his waist begins to bend inwards and his arms shrink slightly, next his adams apple retracts and his lips plump up. You grab his cock and begin jerking him off while you fuck, he starts to moan louder and louder with every sensation, his voice now sounding like a husky woman. His penis shrinks to 7 inches and his balls shrink to cherry size, his 6 pack loses some of its definition and his shoulders slim down, the excess mass all shifting to his softening pecs. As you continue pumping into your girlfriend he grabs his pecs to support them, jiggling more and more as they grow into a firm set of D-cups, retaining a masculine appearance to them owing to his remaining pecs.
Your girlfriend jerks his head back and moans loudly as you feel his balls tense up, as he shoots his first load onto his abs and man-tits. You quickly follow, pumping faster and faster into him before grunting, cumming deep inside his tight asshole, you fall on top of him exhausted as you make out in the sweet afterglow.
After a while the two of you get up, you see that your girlfriend looks like an androgynous version of the little boy he was, with a nice big cock, boyish face and muscles, yet with a huge bubble butt, a gorgeous pair of tits and an overall womanly frame, he/she stands just an inch shorter than you.
"I love you, babe." He wraps his arms around you and nuzzles his face into your neck. You grab two handfulls of booty and give him a cute smack.
"I love you too." You reply, you tilt his head up and kiss him again, as you make out you feel his hands reach down to your ass, you are about to say something before he sinks a finger into your ass, causing you to gasp, before melting in pleasure and kissing him more forcefully, you in turn put two fingers inside his slick butthole.
"What shall we do now?" He asks, eyebrow raised suggestively as you slowly finger each other. "You wanna go for another round or you want me to shapeshifting more?"