After his parents remarried, Yuichi suddenly found himself with a new stepsister, Rikka. Shy and introverted, she had a dominant side that he sensed right away. He realized she was a Doms and decided to train her as his personal plaything. In their shared home, they engaged in activities like panty flashes and foot rubs while mom watched. They snuck off to perform oral sex on each other using toys designed for masturbation. Then, they invited over Yuichi's friend and teased him by showing off their own intimate moments with boyfriends!
