In the confines of their shared bedroom, a curious teen sister and brother explore their burgeoning desires under the cloak of night. The sister, her heart pounding, takes her brother's cock in her hand, marveling at its size and heat. She guides it between her legs, feeling the head push against her virgin entrance. The brother, his breath ragged, slowly eases in, filling her completely. They move together, their bodies slick with sweat, until they reach the brink of ecstasy, pulling back just in time to avoid detection by their unsuspecting family.