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In the privacy of his room, a brother can't resist the allure of his sister's discarded G-string. He slips it on, feeling the soft lace against his skin, his cock hardening at the taboo thrill. With a eager grip, he jerks off, imagining his sister's touch, her scent still lingering on the delicate fabric. His strokes grow faster, his breath ragged, until he explodes in a torrent of cum, staining his sister's thong with his forbidden desire.