Brother-in-law's propensity Ayano Kato

Ayano Kato is a married woman, unsatisfied with her sex life due to her husband's lack of interest. Her brother-in-law, who lives with them, starts to develop feelings for her. As they grow closer, Ayano finds herself drawn to him, leading to a taboo and secretive affair. The brother-in-law takes advantage of his brother's absence and ignorance, engaging in intimate acts with Ayano, including oral sex and intercourse, while trying to avoid detection.