FERA-124 Nearly incestuous sex with mother, only allowing penetration of the tip

Yumiko was annoyed by her son's sexual harassment. When she was witnessed masturbating, she accepted the demanded erotic act in exchange for hush money.From that day on, her son began to demand various plays, and the content escalated. while to. She was cornered until she was finally about to be inserted. Yumiko desperately opposes that it is no good, but her son does not stop. In the end, he proposed a brute force special rule that "If it's just the tip, it doesn't mean you're having sex".