Lay back

You see your sister looking down at you and breathing hard. "Why don't you get on top of the bed, sis?" she asks, nicely. As you get on top of the sheets, you see her slip off her sweat pants as she begins stroking her cock. For a long moment, you feel her eyes travel your body. You see an almost animal lust in her eyes take control as she pushes you down into the bed and rips off your panties.

You lay back as she thrusts into you without any foreplay. You gasp in surprise as your sister plunges into your asshole unexpectedly, sending a jolt of pain through your body. Filled with just a single thrust, you arch into her and moan, closing your eyes in pleasure. You have only a moment, though, before she hesitantly slides out of you again, savoring her first time inside of your tight little ass. "Oh God, sis, you're huge!" you say, which only eggs her on.

She starts to pump faster and faster, savagely fucking you. With each thrust, she pushes you back in the bed until your back is pressed into the wall. With each thrust you feel the wall shake and your breasts bounce. At such an animal pace she can't keep it up for long, though. Soon you feel her throb faster and faster inside of you. The view of her glistening body over you, her breasts swaying, the feeling of being used by your big sis, it soon became too much and you come. You scream out, louder than you thought you ever could, in pure pleasure.

As you start to regain thought, you wrap your arms around you sister even as she continues to thrust into you, pressing your tits into hers. Leaning close as she pounds your body you say, "Come inside me, sis." Those four words push her over the edge as she thrusts once more inside you fully and spews hot semen inside of you, groaning.

As you bask in the afterglow of a job well done you see your sister get up from the bed, her dick rock hard again only moments after pumping you full of cum. You smile, knowing your work tonight isn't done quite yet.