She turned herself into a guy

...think I'd turn myself into a guy," your girlfriend explains. "You know, to no what it's like." Just then, your girlfriend felt her body changing, as she now got to the same height as you, and the back of her hair got shorter. Just then, your girlfriend feels something growing in her shorts, and takes them off, along with her underwear.

What you see is the head of a penis that was coming out of your girlfriends vagina, and she begins to stroke it. The more times your girlfriend strokes, the more it gets longer, until her pussy was now gone. "Wow, I have a penis now," your girlfriend says, as her voice was now changing. "So, this is what an erection feels like." Your girlfriend takes off the rest of her clothes, and starts transforming more, as she rubs her shrinking breasts. You watch as they vanish, but her nipples were still there.

Next, her butt, starts to shrink as well, changing its posture, while at the same time, your girlfriend/now boyfriend was now growing muscles, while at the same time, her/his new penis was getting longer. You blushed seeing him like that, as he cums on his own bed. "So uh, what do you want to do now, babe?" You ask, feeling nervous. "Well," your boyfriend starts. "I was thinking that-