You fuck their asses, you make them like it, and they cum

Instead of their pussies, you fuck their asses. First Jenna. You press against her sphincter, and your girlfriend, says, "No! Not my ass!" Then you slip inside and start fucking her. In a minute, she's groaning and pushing back into you, screeching, "Yes! Yes! Take my ass!" The people in the park are all watching you. You maul her cheeks as you roger her, until she wails into a raucous orgasm, lifting her head up to howl. You feel her channel squeeze you for all your worth. Jessie watches you both with her fingers diddling her pussy.

You quickly switch to Jessie's ass and slip in without a word from her, just a loud grunt. Like her sister, little Jessie is screaming her pleasure in just a minute, and when she comes, noisily, you roar over her back and fill her bowels with hot cum. The sensation seems to make her explode, as her body begins to thrash around. Her sister watches and smiles at your grand display.

They both roll over and look up at you with lust in their eyes.

(Mark 2 XP for making them cum)