Once you recover from the high, you sit up, trying not to look at Steve out of uncertainty about whether you find him attractive, and look at the board. What you see doesn't make you any less surprised or unsettled- the teacher changes the writing to read 'Female Homosexual Sex'. You wonder how the hell that's gonna work for your class.
"Right," the teacher announces once he sees all the boys have finished fucking. "Next, we're gonna do a little role reversal. The point is to show you all how things feel for girls. Try not to worry, you'll probably find you like it more than you expect."
One of the boys puts his hand up. "Wait, so how are we doing a role reversal?"
"Like this!" the teacher replies. He picks up some weird gadget and presses a button on it, and a bright light flashes over everyone in the room for a moment.
A tingling sensation runs through you, and you finally look at Steve as you hear him ask, "Di-did you feel that?"
"Yeah, it felt like..." You gasp with pleasure as the sensation continues to reverberate through you.
"I... this is gonna..." he replies, both of you shivering with arousal.
Before your eyes, both your bodies change in sync and in parallel. Your skin grows smooth and hairless. Your faces both alter to be prettier with softer cheeks, and your voices heighten in pitch as the bulges in your throats vanish. You see each others' hips get wide and curvy and your shoulders get narrow and petite, and your hands and feet shrink a little too.
Distinctly unmasculine noises accompany both of your emasculation. Your nipples swell to at least twice their old size and grow hard and sensitive, and your chests fill out with large soft mounds of flesh. Once they've swelled to a distinctive size, you notice both your penises receding. Your shaft and his tug back into you until you have tiny sensitive clits, and you feel your balls move up inside you, your scrotums turning into flat mounds which vaginal lips develop from.
You stare at Stevie (as you figure it seems appropriate to call her) in amazement. She's a girl now! And... to be honest, you think she's pretty hot. Both of you have astonished expressions, and you hear a woman's voice- apparently the teacher became female too- tell you, "Ok girls, you might still be kinda wondering how you can please each other since you can't fuck with a cock. To be honest, it's fun for a lot of women to just touch each other where it feels nice when they want to have sex."
Stevie suggests, "Um... how about we just see what we feel like doing?"
"Okay..." you reply, and shift over to her. She kisses you and you feel aroused, even more so when she starts kissing down your neck towards your chest. You feel a shiver race through you as her tongue licks up her nipple, and then moan as her mouth encircles and sucks on it. You're moistening between your legs in amazement, loving how good having her play with you feels.
Her hand slides down to your crotch and her thumb brushes over your clit, and you yowl with amazement at how sensitive it is. You can tell it's because all the nerves from your cock were bound together, but even so it's way more intense. Things only grow more intense when her fingers slide between your soaked lips, and you hold her head to your breast to keep her doing what she's doing.
She decides to escalate her pleasure further still, straddling your thigh and grinding slowly on you, panting for air with satisfaction every now and again while continuing to suck your tit. You hold her head to your chest as long as you can and thrust a little up at her hand, slowly noticing she's thrusting at your leg. It's kinda cute and you feel her wetness leaking out onto you and hear her sultry moans and whimpers of pleasure, which egg you along.
You can hardly process how you're about to have your first female orgasm, but you keep all this going any way you can, shifting closer to Stevie, kissing her head sloppily, allowing her grinding and heat and moans to push you closer to your peak. She keeps going, and at last you just start shaking against her and moan loudly and inarticulately, your brain unable to focus on anything except the transformed parts of your body- your pussy practically melting against Stevie's fingers, your nipples and clitoris pulsing, your higher-pitched and more eager moans. It all makes it hit home, harder and harder, that you're not male but female, and this feels nicer than anything you felt as a boy.
Once the high finally subsides, you feel Stevie's crotch still quaking against your thigh, and both of you gasp for breath as you continue to process the high.