In the dim light of the closet, the skinny girl's eyes widen as she takes in her brother's impressive length. She licks her lips, her heart pounding in her chest. Her brother, equally aroused, watches her with a hunger that surprises them both. She tentatively reaches out, her small hand wrapping around his cock, feeling it throb in her grip. He lets out a soft groan, his hips bucking slightly, encouraging her to stroke him. She does, her touch tentative at first, then more confident as she feels him grow even harder in her hand. The air between them is thick with the scent of their arousal, their bodies pressing closer together in the cramped space.