I won't stop milking you in the cowgirl position even if I cum inside you 10 times so that you (my playhood friend) will never go to a brothel again. - Hoshino Natsutsuki

The movie revolves around the intimate relationship between Hoshino Natsutsuki and her childhood sweetheart, referred to as 'Brother'. The title suggests a scenario where Hoshino Natsutsuki tries to prevent her partner from visiting a brothel by fulfilling his desires herself. Through their conversations and interactions, the story explores themes of intimacy, pleasure, and loyalty within their unique bond.