A mother came to Tokyo, worried about her son who lives alone. She is overprotective of her child. Her son gets excited when his mother strokes his head and shows him her panties under her skirt! They end up sleeping in the same futon, and even though she's his mother, his penis gets hard on her body! His mother is also excited by the feeling of his erect penis after a long time! She gently lets him have sex with her, saying, "Don't tell dad."