After you've both come down from the high and cleaned up your messy cum, you cuddle a bit. It's weird how much firmer your girlfriend feels now he's a man, and his scent is totally different, but it still feels really nice.
"I should tell you something else," he says after a while.
"Huh?"
"I can make other people's bodies shapeshift as well as my own." You notice he's got a wry smile on his face. "You wanna try?"
"Uh..." You don't know why you take such a long second to think, him shapeshifting turned you on so much you can't imagine saying no. "Yeah, do what you like to me."
You see him focus his gaze on your body, and an intense shiver runs through you. "I-is this how it feels for you?" you ask, and hear your voice crack.
"I think it's more intense because your body isn't used to it," he replies.
"I feel... l-like I'm tingling all over..." you whimper, the pitch of your voice heightening. You recognize the softer tone and ask, "Are you turning me-"
"-into a woman? I'll stop it if you want," he assures you.
"No, I- I like it..." you pant.
You aren't lying, it's starting to feel really nice. His firm hands run along your narrower neck, brushing over the smoother skin of your cheeks, and touch your puffier lips. He pulls you into a kiss and you take in his intense scent as your dark hair cascades past your shoulders, which you notice have narrowed.
He holds your hands and you notice they've turned more petite and dainty, your muscles more lithe and small. His hands move to your chest and you notice it's turned smooth and hairless, and you whimper as he rubs your nipples and they swell at his touch. They're sensitive as fuck, and only grow more sensitive as soft mounds of flesh swell under them. "Wow, I never knew you'd have such big tits as a girl!" your girlfriend says.
You peer past your freshly-formed breasts as the tingling moves down to your lower body. Your hips are getting wider, your butt filling out and your body hair thinning if not vanishing altogether. Your penis, the only male part of you, is hard from all the feminine hormones, but it doesn't seem as big as your girlfriend's cock. He kisses you and smirks, "You can let him go, babe. You're a her."
As he says that something seems to form inside your crotch and seize your penis and testicles. Your shaft starts to shrink up into you, and with one wet plop and then another, your balls move inside your body. Your scrotum splits open to form a vagina, and your cock recedes away until it forms a tiny clitoris atop your newformed slit.
You gasp for air and stare at your girlfriend in amazement at how he's changed your body. "You're so fucking hot," he says, and before you can really process him echoing your words, he's kissing you and your body is responding to that. Your pussy lips moisten as he presses himself atop you, his cock rubbing your stomach. Shit, you want it inside you...