Bridge's big dick was seen by his stepmother, who then proceeded to have sex with him in an awkward situation. (Orihara Yukari, VOSS-019)

Yukari Orihara remarried her ex-husband, who had been divorced once. Her stepson's penis was so huge that he would sometimes put his hand in her pocket to touch it. This made Yukari feel embarrassed, so she secretly had sex with him without her husband's knowledge!