In the dim light of the closet, the siblings' breaths mingle as they stand, barely clothed, their bodies pressed together. The brother's hands tentatively explore his sister's curves, cupping her breasts, his thumbs brushing over her hardening nipples. She gasps, her hips pressing against his growing erection. He slips a hand between her legs, feeling her wetness through her panties. She moans, her head falling back, giving him better access. He rubs her clit, his other hand squeezing her ass, until she comes undone, her body shaking with her orgasm.