"Whose feelings are stronger? The one who makes the other feel good wins!" the beautiful mother proposes, proposing a wicked challenge. Her foolish son unties her yukata, leaving her naked, and as he stares intently at her spread legs, she giggles shyly, saying, "Don't stare like that, it's embarrassing." They devour each other's genitals, and as he penetrates her raw, she writhes in ecstasy, saying, "I'm about to cum." The challenge ends inconclusively, and they both climax together in a forbidden, unprotected sex scene...