My brother and Mai have been married for three years, and no matter how beautiful a wife is, her relationship with her husband (brother) grows colder with each passing year... One morning, after a fight with her husband over something trivial, Mai's daily stress reaches its limit, and as a result of being desperate and not knowing where to go, she heads to her husband's younger brother's (brother-in-law) house... When Mai sneaks into his room, she feels the limits of her daily desires, and before she knows it, she crawls under her brother-in-law's sheets and seduces him... And she unleashes all the desires that have been building up in her private life during her tired years on his brother-in-law, and they have intense, passionate sex. Even though she knows it's wrong, her sister-in-law's temptations don't stop, and her sense of immorality towards her brother blows away her reason, and they end up entangled in the sheets many times and cumming inside each other over and over again from the morning. This is a record of that.