I couldn't resist and creampied my wife multiple times as she pretended to be caring for me after fighting with my wife.

Even before we got married, my wife's younger sister, Rei, often played together. I thought she was cute, but I never realized it as a member of the opposite sex. Until that day... Three years after I married my wife, one day I had a fight with my wife and left the house, but I came to Rei's house without any need to go. "Hey... why did you marry your sister? Can't you do it?" I thought I was kidding...Rei-chan boldly seduced me... and I couldn't refuse.