The shower's hot spray pelts their entwined bodies as brother and sister find themselves alone again. She turns, her ass pressing against his crotch, feeling his growing bulge. He grabs her hips, grinding against her, his hands sliding down to her pussy. She spreads her legs, whimpering as his fingers find her clit. He teases her, rubbing her wet slit, before pushing two fingers inside. She bucks against him, her hands against the wall, as he finger-fucks her, his cock straining against his boxers, eager for its turn.