Horny siblings, confined in the cramped attic, can't keep their hands off each other. She's wearing nothing but a thin shirt, her nipples hard and visible. He's in just his boxers, his cock straining against the fabric. They start with tender kisses, but it quickly escalates. He's inside her, fucking her slow and deep, her legs wrapped around him. They're both close, their bodies slick with sweat, when they hear footsteps downstairs. They freeze, their hearts pounding, the thrill of almost getting caught making their climax all the more intense.