In the throes of puberty, a curious sister can't resist peeking at her older brother changing. She finds herself captivated by his growing bulge, her hand instinctively finding its way between her thighs. As she watches, she rubs herself, her breath hitching as he turns, catching her in the act. Embarrassed, she flees, only to return later, finding him asleep. Unable to resist the taboo allure, she approaches, gently tracing the outline of his cock through his shorts. He stirs, waking to find her hand on his crotch, his sister's eyes filled with a mix of shame and desire.