Brother secretly records sister’s sex MMS with her lover

A brother gets annoyed because of his older sister. She always dominates him, so the brother decides to do something to keep her in control. One day, one of his friends tells him about his sister and her lover. The brother keeps watch on them. Soon, he gets a chance to control his sister. He hears his sister calling his lover home after their parents go out. After that, the brother puts his mobile on the shelf and records his sister’s sex MMS.