Heather chooses for you

You start to move toward Ashley, but Heather's shapely leg moves between you and your girlfriend. Heather looks pleadingly at her sister, pouting cutely. Her fingers play lightly with Ashley's nipples.

"He's got me so horny already.... Can I have him first? Please?" Heather moves over Ashley, legs spread and giving you a spectacular view of Heather's bare pussylips and ass. Ashley grips her sister's butt and pulls her up further, then adjusts her hands to spread Heather's cheeks further. Looking over Heather's shoulder at Ashley, you see her smile approvingly. You know there's only one option present.

Grabbing the lube from Ashley's nightstand drawer, you get your hard cock ready. Without preamble, you put your hands on Heather's hips and your cock deep in her ass. She screams in a mix of surprise, pain, and pleasure. You give her only a few moments to get used to the feeling before you start fucking her in earnest.

"Oh, God.... He's in my ass.... It's so deep in my ass...." Heather moans to her sister. "How do get something so big in there, sis?"

"I don't," Ashley coos back. "I like his cum in my pussy or my mouth." You can feel Ashley's fingers on your balls as you fuck her sister's ass. The brief touch vanishes as Heather squeaks in pleasure; the wet noises tell you where Ashley's fingers ended up. Ashley starts to nibble on Heather's ear and neck; you lean down and take the other side. Heather moans and shudders as she orgasms. You can't hold back any longer and let loose your seed deep into her innermost depths.

You pull out when your orgasm subsides; Heather still squirms at the end of hers. Your cum drips from her gaping ass, dribbling onto Ashley's already-soaked fingers in Heather's pussy. The sight of the two sisters as they are takes your flagging member and brings it back to life.

Neither of the two girls seem to be paying attention to you. Heather is still riding on the euphoric cloud of her climax. Ashley is still playing games with Heather's pussy and neck.