The family's gone, leaving the two siblings to their own devices. She's young, with a tiny frame and a big ass, her dark skin contrasting with his pale body. He's always found her attractive, but today, she's making it impossible to resist. She's in the bathroom, her body glistening under the water, her small hands rubbing her pussy. He joins her, his cock hard, ready. She takes it in her mouth, her tongue swirling around the head, her eyes looking up at him. He groans, his hands tangling in her hair. Then, she turns around, her ass pressing against him. He grabs her hips, his cock sliding into her tight, wet pussy. He fucks her hard, her cries of pleasure mixing with the sound of their bodies slapping together. She comes, her body convulsing, her pussy squeezing his cock. He pulls out, his cum shooting onto her back, mixing with the water.