Hastily, you and all the other girls head back to the changing rooms and get dressed, the ones who had been boys (you included) barely noticing how you had feminine clothes now. Once you got everything back on, you went back to lessons as if nothing weird had happened in that PE class. It was pretty fucking surreal.
Not surprisingly, you couldn't take your mind off it. You'd had sex with Mina and gotten her pregnant, and then you had sex with Mina as a man and he got you pregnant! It felt so surreal to think how what you'd done that morning was literally not possible, and yet it had happened. The weird queasiness in your stomach reminded you of it here and there.
Once you finally got home, you were able to lock your bedroom door and take a look at yourself. Sure enough, you were a girl, as if you'd been one your whole life. It felt so absurd to think, and yet, here you were.
Soon something even weirder started to happen. Thinking about your old boy's body was... kinda turning you on. Cocks were so big, so hard... they could fill you up and make you feel so nice...
Your body was reacting to the mental image of a hard cock. Your nipples and clit were stiffening and you were leaking juices- including a hint of Mina's cum still inside you. You ran a finger along your slit and got to taste the combined tang of your juices.
Fantasies started running through your head- Mina's sperm surrounding your egg, weaning away at it until they managed to fertilize it. Your stomach swelling with his baby, as his stomach swelled with yours. You start rubbing your clit carefully, amazed at how sensitive it is, and carefully do the same with your breasts. Your mind goes to handsome men with cocks hard for you, wanting to jack them off over you or put them inside you. You know from your own experience how horny guys get, and how it feels to rub yourself off- and you know this feels way better.
As your mind overflows with fantasies of men rubbing themselves to you, fucking your tits, fucking your mouth, pounding your pussy, fucking your ass, you race over the edge, and soon you whimper out a moan as you cum hard. You slowly come back down from the high, and remember what happened to you...