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Her brother-in-law Yuta is staying with her for a while while he is job hunting. At first, Rio accepts with a smile, but... Yuta secretly has feelings for her and repeatedly rummages through her underwear and peeks at their lovemaking. She pretends not to notice his lewd gaze, but the beast controlled by desire mercilessly attacks her. Rio's relentless thrusts bring her to orgasms many times, something she could never experience with her husband. Before she knows it, the pleasure resonating in her womb takes over her mind as well...