His relationship with his sister-in-law was limited to kissing... They couldn't resist the thick, unspoken saliva between them, and continued to secretly engage in sexual intercourse. Itsukaichi Mei ROYD-146

Mei gradually drifted away from her husband's heart and began to fall for her brother-in-law, who lived in the same house. A forbidden love slowly developed between them… They agreed to only kiss and continue their love, enduring hardship and humiliation. But desire could not be suppressed. In the moment when love and desire intertwined, Mei revealed all her feelings for me. Although she still had feelings for her husband, she ultimately craved each other intensely, crossed the line, and ended up ejaculating inside each other… Will this relationship lead to destruction, or…?