[NKKD-147] Last Night, The Woman I Fucked Wasn’t My Wife!

My wife and I have been married for five years, she has a younger sister, Ruka, comes to our house for a visit and stayed for a night.
That night, I had a little too much to drink at a company party! I went home drunk, and for the first time in a long time, I tried to have sex with my wife, who was asleep in our bedroom.
When I woke up the next morning with a hangover, I found my wife’s sister cleaning in the kitchen, preparing breakfast, and she told me that my wife still didn’t wake up from the guestroom!