Yukawa Reiko, 53 years old. Her son Tatsuya has always been clingy, and lately he comes to her every night wanting to sleep together, making it a habit to lie under the same futon. But recently, he started touching her breasts. At first, she thought it was just her imagination, but as days passed, his touches grew increasingly lewd, deliberately groping her most sensitive areas. With her husband away on a business trip and loneliness creeping in, she finds herself giving in to his advances—and beginning to feel pleasure.