I was in a state of boredom with my wife, and was seduced by Yuki (step-sister) and creampied me many times...

My wife went on a trip alone. As the relationship between the couple is getting colder, they are unable to withstand the temptation of their wife's younger sister, Yuki... "You're probably having an affair on your own while traveling..." That's how rationality is blew away from you to the point of thinking it's no good... In the day, at night, and in the morning, while my wife was away, I had intensive sex with Yuki, and I had creampied her over and over again... and the immorality felt so good...