In the hushed intimacy of their shared room, twin sisters Taiga and Iruka, animated in the style of a 2D masterpiece, find themselves drawn to each other's curves. Their eyes meet as they change into their nightwear, the air thick with an unspoken tension. They reach for their phones, browsing hentai galleries, their breathing syncing as they explore the same taboo images. Iruka tentatively traces her sister's form on her screen as Taiga watches, her own hand slipping beneath her covers.