With the door locked, siblings huddle together, their bodies betraying their pious upbringing. He tentatively touches her, feeling her shiver as his fingers brush her hardened nipples. She gasps, guiding his hand to her wet, aching core. They stifle their cries, aware of the risk, as they give in to their taboo desires. Her hymen stretches to accommodate his girth, and they move together, slow and steady, until they collapse, spent and ashamed, their bodies marked with the evidence of their sinful act.