Back from a wild night out, a drunken sister and brother find themselves alone and horny. She, in a short skirt and heels, teases him mercilessly, rubbing her ass against his crotch. He, equally inebriated, can't resist her advances. She bends over, offering her pussy, but he slips it into her tight ass instead, making her moan loudly. They fuck hard, the sound of their bodies slapping echoing through the room, until they both collapse in a sweaty, satisfied heap.