Fiercely religious siblings, Kyuya and Riho, find themselves in a cramped closet, their bodies pressed together in the dim light. Guilt gnaws at them, but the heat between them is undeniable. Riho's breath hitches as Kyuya's hardness presses against her, his cock straining against his pants. They freeze, eyes locked, as their father's voice echoes in their minds, "You mustn't move!" Yet, Riho can't help but grind against Kyuya, feeling his length twitch against her. Kyuya, torn between desire and duty, grabs Riho's hips, pulling her closer, their bodies moving in a rhythm as old as time.