Transform into Sam

You look through her clothes to find some to wear. You take a matching pair of white panties and a bra, sweatpants, a sports T-shirt, some socks and a hat of hers. She is a bit smaller than you and had long blonde hair. She was very beautiful looking and was very popular, but didn't have a boyfriend. She was very slim and had B-cup breasts and a little, but still good shaped ass.

You looked into her mirror and striped out of your clothes. You begin with putting on her socks. You saw your feet change again. Then you put on her hat and her sports T-shirt and her sweatpants coz the bra would have broke because your chest is to big. You see your head changing and your hair growing. You feel how your stomach gets flat and all your muscels disappear. You feel your legs getting thinner. You take your clothes off again to see a copy of Sam. Only that her chest and ass were completely flat and that she had YOUR dick. You touched your dick with your sister's petite hands and it felt great. But you wanted to swap everything with her. You put on her panties to see how the bump in your pants disappeared and how your ass filled out. You put on her bra and see how the cups begin to fill out. Looking in the mirror you saw a perfect copy of Sam, your 18 year old sister. Only sawing her in her underwear turned you on.

Suddenly you hear your mom from the living room "Kids. I'm home!" You put on the T-shirt and the sweatpants and go down to greet her, trying to act like Sam (you were quite a good actor). "Hey Mom. John just left to meet some friends." "Hello Sam. Thanks for telling me." She gave you a kiss on your cheek and left to her room. It kinda felt strange to get called Sam, but you almost got used to it. You went back into Sam's room.