Bored siblings, both addicted to big dicks, find themselves alone one afternoon. The brother, horny and restless, catches his sister watching anal porn on her phone. Intrigued, he sits next to her, his massive cock tents his pants. She notices, licks her lips, and asks if he wants to try it. He nods eagerly. She lubes up his thick cock and positions herself on all fours. He teases her tight asshole before pushing in, making her gasp. They fuck hard and slow, her ass stretching around his cock, until they both cum, her ass filled with his load.