Invited by her son on a hot spring trip, Sumire couldn't be happier. In her marriage to a husband who never enjoyed onsen, she'd never had the chance to experience one. Excited beyond measure, she looked forward to this getaway. Arriving at a charming inn, the two headed straight for the baths. Soaking in the outdoor hot spring under the warm sunlight, Sumire relaxed completely. Unseen, her son secretly watched her. That night, he began giving her a massage, hoping to soothe her. But each touch stirred feelings he'd long kept hidden. Late into the night, as Sumire slept peacefully beside him, his restraint finally shattered. Gently pulling back her futon, he began caressing her body exposed beneath her yukata. Waking to the sensation, Sumire opened her eyes in shock. Though she whispered "Stop," he silenced her with a forceful kiss. When he confessed, "I love you as a woman," and asked, "Do I have to keep enduring this forever?" her heart melted with affection. Overcome with love, she whispered, "Do whatever you want with me," offering her body to her son.