"In the dimly lit room, brother and sister exchange furtive glances. He's been caught masturbating, his thick cock still throbbing. She watches, intrigued, as he strokes himself, his pre-cum glistening. Their eyes meet, and the unspoken invitation hangs heavy in the air. She tentatively reaches out, wrapping her small hand around his shaft, feeling it pulse. He gasps, his hips bucking slightly. She's never touched another woman's cock before, let alone her brother's. Yet here she is, giving him a hand job, her pussy aching with desire, her own hand creeping between her legs."