Cecil and Saya are close sisters. - Her beloved father remarries, and she lives with her new mother and her stepbrother. - One day, my father and mother went out during a hot spring trip and only three sisters and brother-in-law were at home. - I have a conversation with my brother-in-law who has just lived with me, but there is no excitement, and my shy sister keeps a distance from my brother-in-law. - That night, my brother-in-law creeps into the sister's room sleeping on a bunk bed. - The older sister sleeping on the lower bunk is forced to take off her pajamas and is forcibly fucked, but the younger sister who was sleeping on top of her is in heat due to the leaking breath and shaking of the bed! - The brother-in-law who noticed it will enjoy the sister bowl on the bunk bed!