The narrator cannot suppress his fantasy of watching his beloved girlfriend Uta Hibino be taken by another man, so he hires a specialist service. He worries it may fail because she is normally fiercely dominant, but sex with a stranger unexpectedly awakens her submissive side. She even squirts repeatedly, something she has never done with her boyfriend, while becoming addicted to choking, rough penetration, and creampies. Humiliated yet intensely aroused, the narrator realizes he may be the greatest masochist of all.