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What Koyuki wanted was a little happiness with her sickly but kind husband. One day, her husband is deceived by a guarantor and shoulders a large amount of debt. Husband's brother appeared in front of Mr. and Mrs. Koyuki who were cornered in debt collection. The brother-in-law offered to help, but he was an anal-loving pervert. At first it was for debt repayment. However, Koyuki falls into anal hell with strong anal expansion, strong anal masturbation, and two-hole fuck!