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"My daughter-in-law turns into a meat urinal for kid ..." Tatsuhiko took a long time to persuade his childhood friend Nao, but it was a conditional marriage that sex was not forced. One day, when two nephews of Tatsuhiko come to stay, the two who have a good intuition immediately find out the relationship between Tatsuhiko and Yuna, and conspire with each other to set up a strategy to sleep Nao.