While his wife was away traveling alone, he had a forbidden secret meeting with his sister-in-law, Riho... As the relationship between the couple grows colder, she becomes unable to resist her temptations... ``My sister is having an affair while traveling anyway...'' Still, her rationality is blown away to the point where she thinks it's no good. Day, evening, night, and the next morning, he has intense sex with Riho, who is much more erotic than his wife, and cums over and over again. seek each other