"What? Are you serious?", you ask. You liked your girlfriend the way she was. She high a tight ass and B-cup breats. Sure, neither were huge, but you didn't mind. Your sister, on the other hand, had huge, EE-Cup boobs, and a big ass.
"Well, I guess I'd wanna know what it'd feel like. I mean, sometimes I wish I had huge boobs and a huge butt.", your girlfriend replies. You shrug, and concentrate on the thought of her swapping those traits with your sister.
"I don't know why, but for some reason, my bra is feeling a little tight", your girlfriend says, looking down and gasping as she views her breasts swelling before her eyes. Feeling a stining as the fabric digs into her skin, your girlfriend unhooks her bra, and you gret a hard on as you watch her growing breats jiggle. She gets up, and suddenly feels her own pants tightening on her rear. With much trouble, she is able to fight her pants down to reavel a monster booty, hich had turned her own panties into a thong. Your girlfriend puts her hand on her hass, and cups her new breasts in question.
"Allow me to explain", you say, looking upon your Girlfriend, "You see, I've somehow managed to gain the ability to swap people's physical features.
"So...you mean these tits and my badonkadonk are actualy your sister's?", she asks, stopping herself from moaning after rubbing her big nipples a bit.
"Exactly. I could make you look like whatever you want", you reply to your girlfriend. How does she respond?