Fuyu is an ordinary housewife with a teenage son. One day, her son catches her masturbating and uses it as leverage to demand sex. The son can't hold back... but they're family... if he comes inside, it would be like cheating... front is off-limits, but the back shouldn't count as incest. Anal won't get pregnant, so no matter how much he releases, it's fine. Fuyu offers her anus to her son. The son on the verge of explosion relentlessly assaults Fuyu's anus.
