In a traditional Japanese home, a young woman, her cheeks flushed with embarrassment, sneaks glances at her brother's bulge. Their parents are out, and the tension is palpable. She's a virgin, and he's never touched another. Their eyes meet, and the unspoken word hangs heavy: incest. They explore each other's bodies tentatively, her fingers tracing lines on his chest, his hands cupping her small breasts. She gasps as he touches her wetness, and he groans at her tightness. They fuck slowly, carefully, against the sliding shoji doors, her moans drowned by the rustling of the paper screens.