His chest and abdomen begin to bubble as they firm up and muscle quickly grows onto him. His pecs become firm and large, like pillows of muscle. You watch as his once skinny abdomen area quickly begins to form not 4 or six but 8 pack abs. Tight and rock hard you run your hand across them, noticing right then the pink goop that pestered you was now gone from your hand.
His naked flesh feels good against your hand as you watch his arms become large and muscular as well. You quickly move your hands away as the black goop covers his now perfect torso, placing a tight black leather coating over everything, including his hands.
You smile unable to control how extremely turned on you are right now as your best friend becomes a sex god right before your eyes. The goop stops spreading at his neck, but the changes don't stop. You watch as his short blonde hair turns black and begins to grow. His boyish face becomes chiseled, dimples form on his mouth and his green eyes turn a hypnotic blue.
His hair becomes shoulder length, several piercings develop on both his ears and on his lip.
You feel something come over you as you watch the changes complete, you look down and notice that without thinking, had stuck your fingers into your tight new pussy and began to masturbate over your new friend. He grabs your hand, removing it from under your dress and points his gorgeous new eyes in your direction
"Let me help you with that."