You make her like it, and she cums.

You **** your hard, thick cock into Jessie's pussy from behind. Your girlfriend's hot little sister is so young and tight. You hold onto her tight, tiny little ass, and she moans as you hard fuck her. "Oooh, yes! Yes! Yes!"
Jenna watches you fuck her little sister, loving every second of it, every thrust, pinching her nipple, and rubbing her pussy.

Then Jessie throws her head back, arching her back, and tossing her long dark hair. You feel her pussy constrict around your cock, flooding with her wet, juicy teen orgasm. She moans and writhes and bucks, cumming hard. It's so good, you cum too, hard, bursting inside her, filling her hot sweet pussy with your seed. Jenna comes up behind you, and kisses you, as you slowly slide out of her sister. Jessie is exhausted, panting and sweating, her freshly fucked pussy dripping with your cum.

(Mark +1 xp for making her cum)