In the dim light of the closet, Krystal and her brother stand, their hearts pounding with anticipation. She reaches out, tentatively touching his erection through his jeans, feeling it twitch at her touch. He groans, pushing his hips forward, encouraging her. She unzips him, her breath hitching as his cock springs free, hard and ready. She wraps her hand around it, stroking slowly, before dropping to her knees, taking him into her mouth. He grips her hair, guiding her as she sucks, their closeness intensifying their taboo connection.