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With a pounding heart, he closes the door, leaving only a crack to peer through. His sister's form comes into view, her every move amplified in his mind's eye. She begins to undress, her body revealed inch by inch, and he can't help but follow her lead, his hand working his cock in time with her movements. The sight of her, coupled with the taboo nature of his act, drives him to the brink of orgasm. His breath comes in short gasps, and his grip tightens, the pleasure building until it threatens to consume him. But just as he's about to let go, his sister turns, her eyes meeting his through the crack in the door, freezing him in place, his cock pulsing with unspent desire.