Take her offered ass

You run your hand along her smooth ass, and push her down onto the bed, face first. "Hmm, I'm going to fuck your ass good and hard."

She looks up at you and nods. "Just be nice and rough stud."

You look at her, and your cock is already hard as a rock, and after you rub her pussy with your cock to get it nice and lubed up, you ram it into her ass and start banging it deep and hard. You see her moaning and grabbing the bedsheets, as she squeezes your cock hard.

Her sister wakes up and watches you for a few seconds before...