He takes the potion, then with a deep breath, gulps it down, and empties the bottle, before slamming it down like one would a shot glass.
"Gaaah! That tastes disgusting!" He groans.
Nearly ten minutes pass.
"Hey, you sure this isn't a du- Uuhgh!" He groans, doubling over. Right before her eyes, his body changes, becoming softer, and more feminine. His chest pushes out into a pair of C cup breasts, and his ass fills out more, becoming a proper, girly ass, with plump curves. His hair lengthens, growing down till it reaches a spot just above the middle of his back. His dick shrinks, leaving him with about an inch of flaccid penis.