Like she asked

You quickly pull out of her tightest snatch and stand her up from the couch. Then you push her shoulders down, forcing her to kneel at your feet. Madison's eyes are wild with lust as she reaches for your cock, stroking it fast.

"Gimme your spunk, John! Mark as yours!" she squeals just as you launch your first load, grunting loudly. Your creamy cum splatters across her face and tits. Your friend's sister gasps as your hot jism keeps coming, some filling her mouth, some getting in her hair, and one big squirt hitting her straight in the eye. Madison shakes shrieking as she has an orgasm from your cum. She opens her one unpasted eye and sucks your cock as far as she can take it, about halfway. Once she has you cleaned off, she sits back on her heels.

"Fuck, John! You follow directions! That was so hot."

Suddenly, Jen is kneeling next to Madison, licking off her face and boobs. She lingers over her sister's nipples until Madison tilts her face up and kisses her. They clench with Madison still covered in your spunk. Your cock has recovered.

"Anybody have a condom?" you ask.