An older sister comes to pick up her younger brother who has come home for the first time in a long time. As she is walking up the stairs, she notices her brother staring at her upskirt and gets a little excited. The tsundere older sister can't help but get jealous when she sees her brother getting along with other sisters and ends up being mean to him. Even though he is being bullied, the younger brother gets a hard on as he watches his sister's defenseless upskirt. They end up fighting and playing tag, but then they end up alone in an empty room and their hidden sexual desires explode. The older sister rubs her erect cock against her sister's firm ass and sucks her beloved brother's cock with gusto. Once he crosses the line and inserts it, their sex life is unstoppable.