She had been his fuck buddy for years before he married, and their relationship continued afterward as she became his mistress. When his wife gets pregnant, he tells her they have to end it. She understands, but asks for one final hot-spring trip together. They leave intending to settle everything and say goodbye, yet their feelings flare up all over again. On what should be their last night, he passionately fucks and creampies the beautiful mistress who still does not want to let him go.