On the first day of their cohabitation, a neighbor complains about noise during sex, banging on the shared wall. When the girlfriend goes next door to talk, the neighbor forcefully initiates sex with her. Though she resists, she ends up climaxing from the intense pleasure. The rough sex awakens her latent masochistic desires, something her boyfriend never brought out. Later, the neighbor shows her a video revealing how, even in unwanted situations, her hips instinctively began moving in response.