The younger brother made a very wrong decision when he and his beautiful young wife Yokoyama lived with his unmarried older brother, which was no different from giving himself to someone else. Indeed, the older brother had been single for a long time, so his sexual desire was natural, but the factor that caused him to have that desire was his younger brother's wife. She was truly a slutty woman, not having enough of his younger brother, she now went to seduce his older brother. But she was also very clever when she continuously did sexy, arousing actions, typically intentionally wearing pants with holes in the private area during yoga practice with her older brother present so that he could not stand it anymore and had to pin her down to have sex. After that time, they had feelings for each other, a very ambiguous but also very deep feeling, to the point that when the wife was giving her husband a blowjob, the older brother was also secretly having sex with her behind.