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My husband brought my brother-in-law, Yuji, home for the first time in a while. His wife, Aya, is delighted to see him again, but... Aya, who is weak and easily swayed by other people's opinions, is swept away by Yuji, who knows about the troubles of infertility, and fearfully opens her legs. Aya's sexual desire gradually welled up from within her body as he skillfully made her body melt with his persistent and precise caress. The body that continues to be developed is unaware of the exciting infidelity with her brother-in-law.