You don't have a girlfriend yet so you can't pass an opportunity like that ! You strip and start to fuck the girl. You're having a blast but the woman kept the bra on and it detached itself. It then fell on you and your body started to change. Huge boobs popped out of your chest. Your hairs and ass grew. Your body got thinner. Your body hairs disappeared. Your face became more feminine and finally, your penis was replaced by a vagina. You became a girl !
You were shocked but the woman didn't pay attention to the changes and was still fucking you !