In a moment of drunken truth or dare, a sister and brother make a taboo promise - she'll peg him in the ass. The next day, their curiosity piqued, they lock the door and explore this new fetish together. She teases his hole with her fingers, making him squirm, before sliding a thick strap-on dildo deep into his virgin ass. He moans and takes it like a champ, his own cock rock hard as she pounds him.