As you continue thrusting harder and harder, you begin to notice her moans are growing higher in pitch, while her eyes are turning to a beautiful light blue, and her hips are widening, pressing her now beautiful, heart shaped rear into your groin. Her stomach then tightens into a firm six pack and her nipples enlarge while her breasts swell out to a hefty D-cup and her limbs grow slimmer. As your girlfriends face begins to pop and change shape, her curly brown hair becomes straight as a ruler and brightens into a blonde while growing down to her waist and tying itself into a high ponytail. It's then that it hits you who she was transforming into: Your girlfriends formerly round face has changing to match that of your teenaged, bratty sister's face. Finally, her fingers grew longer and daintier as black nail polish applied itself to her long fingernails and toenails, while make up was applying itself to the face you could only see as your sisters. You sister, who was now sensually riding your cock. And according to the look in her eyes- she just realized who she was looking like too.
She moans before commenting in her new bitchy voice while rolling her beautiful blue eyes, ”God, is this going to take much longer? I'm, like, totally going to be late for practice.” Upon which you release your semen.
“Okay that was, like, super hot. Thanks again for helping me get off before practice, big bro.” Your girlfriend/sister says as she cuddles up next to you.
Picking up her role playing queue, “Anytime, sis.” Grabbing her by the ass and pulling her in for a kiss.
“So what now?” She says, placing her manicured hand on your chest.