Thanks to my stepmother, I've been doing lewd things with mom friends every day. The hikikomori son rapes his stepmother every day. The stepmother is afraid of her son and does as she's told. Not content with just being a daily outlet for his sexual desires, he has his stepmother bring her friends home, drugs them to sleep, and then repeatedly ejaculates inside them while they're unconscious. Gradually, the stepmother starts cooperating with her son, becoming an accomplice in trapping mom friends. Overwhelmed by guilt but dominated by fear of her son and his penis, she commits various heinous acts.
