Wear her like a costume

You pull the water bottles out of her vagina and ass as she breaths heavily "What made you change your mind?" she says, still trying to process the water bottles.

"And idea did." You reply as you plunge head first into her vagina. Even with her screaming you keep on pressing on, eventually the screams slowly turning to moans as you are climbing into her. As you are ready to slide your bottom half into her, you look up and see three holes, so slide your right arm into the right hole and take control of her arm, forcing it to fondle one of her breasts and causing her to moan.

you finally push your legs into her torso and slide the rest of your body into her appendages, your hands into hers hands like gloves, your mouth into her mouth like a gag, and your feet into her feet like shoes, and with that you take full control of her.

"I cant believe that worked!" You say with your girlfriend's voice while getting up, and even with your new sizeable breasts, you walk easily to the mirror to check out your new form.

Seeing your new sexy form your hands move to your new breasts and vagina, and even with you just wearing her you can feel them as if you had fully became her. As your mind gets flushed with ecstasy, your girlfriend's memories come with, allowing you to learn everything your girlfriend ever did, including some guys in a strip club. Maybe you should meet up with one of them?