You lie there recovering, and slowly notice two things that surprise you- the stirrups holding your arms and legs in place have released, and the doors don't seem to have opened to let you out yet. You kinda assumed one or the other of those things would happen, but apparently not.
But then all of a sudden, the doors in front of you open, and before you can get up and leave through them, a naked boy about your age comes in. Like you, he's totally naked, and you quickly realize he must be one of the girls from your year. You're not sure who, and you figure it doesn't really matter- hell, he might not even have chosen a boy's name for himself yet. You sure haven't got a girl's name for yourself yet.
You also realize you're both looking at each other's bodies without really thinking about it. You feel drawn to his handsome, firm chest and the big thick shaft and balls between his legs, and you can sense his eyes on your large soft tits.
When he reaches you, you finally force yourselves to make eye contact. "Hi," he says sheepishly, his throbbing, freshly formed cock about an inch from your pussy if that.
"Hey," you reply, awkwardly grinning and giggling a little.
He puts a firm hand on your cheek, and both of you blush. "Uh... do you mind if I kiss you?" he asks.
The feel of his firm touch and the sound of his deepened, masculinized voice seem to awaken something in you. "Go on," you say, and he leans in and his warm lips meet yours. You kiss back, feeling shaky as juices continue to seep from your slit.
When he breaks the kiss, you ask him quietly, "Do, uh... do you want to fuck me?"
He blushes. "If you're OK with it, yes. To be honest, I think... I think I want to breed you."
Something clicks in you as you hear that. It's like a primal sense of need, of purpose, redefined from the person you used to be but just as strong in your new form. The last pretense deep inside you that you are a boy is cast off, and you embrace this feeling of feminine longing.
"I want that too," you admit.
He rubs his cock head along your lips, and slowly pushes it inside your moist hole, making him pant and you gasp at the feeling. You've never had something inside you, and your body clings to him tightly. He's so unused to the feeling of pressure on his penis he seems hard pressed not to cum at first, but your vaginal muscles and his hips relax at the same time, the two of you eager to ensure your pleasure is prolonged.
Soon you put your soft hands on his chest to feel it, and he responds by cupping your boobs. You moan in surprise at how nice it feels, the contrast of his larger, coarser hands against your flesh intensifying the feeling. Your passage spasms around his cock, and a moment later he starts thrusting his hips again in response. "Sorry," he breathes, "I can't control this!" You don't blame him, you know how uncontrollable a penis feels to have sometimes and it doesn't hurt anyway- if anything, it feels even better as his head rubs against a sensitive spot deep inside you and he grabs your hands with his own tightly.
Pretty soon, you hit your peak and cling to him eagerly. Your orgasm feels intense and dreamlike, as if every part of you is pulsing with newfound pleasure and femininity. The sensations from your vagina, your breasts, your clitoris, and how this boy is touching you hammer it home- you were a boy, but now you're a girl, and it's so different you can hardly put it into words.
At the same time, he grunts and you feel him cum inside you, his warm seed shooting into your pussy and filling you. You look at each other, breathing heavily in the afterglow of orgasm, and kiss passionately.