Both of you change

The beam deflects off the mirror and hits Sarah square in the face. She starts convulsing as the magical effects of the gun begin to take effect. With Sarah unable to control her transforming body the gun goes off again and hits you in the chest

You are unable to move, but you can see the changes that are happening to Sarah. Her hair becomes a dirty, obviously fake blonde color. Her school blouse transforms into a boob tube which show off her tits which increase several cup sizes again. Her conservative skirt shrinks and becomes a tight leather skirt which barely covers her crotch. Her body is given a full tan and her face is given an instantaneous sexy, but trashy makeover.

As you are taking in the new appearance of your girlfriend you feel your body transforming. You shrink several inches. Suddenly you feel a tingling in your crotch as your cock disappears and a new vagina opens like a flower blossoming. Long and luscious brown hair flows down your back. A pair of huge breasts erupt from your chest. They are so big they surely could not be real, but as your manicured hands reach for your breasts and you feel them through your revealing low cut top, you knew that they were real.

Suddenly the physical changes stop and you feel your mind and thoughts slipping away and being replaced by a basic need for sex and money. The thoughts of a dirty prostitute.