ksbj399 — Mother-in-Law, That Outfit Is Simply Unfair—Mako Oda

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A married couple stays with the wife’s family while preparing for childbirth. While organizing her daughter’s belongings, mother-in-law Mako discovers an old promotional-model costume and slips it on out of curiosity. When her son-in-law comes home, he mistakes the alluring figure from behind for his wife and embraces her. By the time he realizes she is his mother-in-law, his desire is already impossible to suppress.