A room where you can't leave without ejaculating inside someone. Four men and one woman are gathered in a small space, and they can leave once they pay off their debt. The rule is that each ejaculation reduces the debt. Since there's only one woman in the room, this is a story about an office lady being relentlessly penetrated. Kuroshima Rei HMN-875

The man and woman confined to a cramped space with only one bed are both burdened with debt and deemed incapable of repayment. As a social experiment to address the declining birthrate, the rule is that if the woman becomes pregnant, all debts will be wiped out. Successful implantation allows them to leave the room. The woman is Rei, a high-powered office lady who has squandered her money on male escorts and incurred financial debts with multiple clients. In this space with only one woman, there is inevitably no other way to leave except by ejaculating inside her—the immoral man who takes advantage of the situation to rape her. The penitent knight who actually wants to have sex but tries to protect the woman. The cowardly man who hesitates to act out of guilt. A collective orgy of ejaculation, a mixture of despair, inner conflict, and lust!