The guy is a debt collector for a financial company in Japan. He went to a nearby debtor's house to collect monthly interest. He heard it was a beautiful female customer. He came many times but didn't see anyone inside. The house saw that the door was unlocked, so he went into the house to see her. When he got close to the toilet door, he heard the sound of water mixed with lustful moans and screams. He was curious and came closer and the ending was really happy.
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