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"I swear on my semen that I will absolutely be a human toilet for my sister..." When Miki, the older sister, found out about her sister's huge debt, her strong-willed personality got the better of her and she went to the debt collector's hideout alone without consulting anyone. "Are you prepared to pay back my sister's debt, and pay back the money on her behalf?" Miki accepted the extremely unfavorable exchange conditions. All of this was to save her one and only sister... She was soaked in semen that she was on the verge of getting pregnant. The aphrodisiac was so strong that she couldn't think clearly, and the thick cock continued to piston into Miki over and over again... The shameful rule of repaying the debt as a human toilet does not allow her to just keep swinging her hips and get pregnant for her sister.