Ever Since That Day, When I Accidentally Fucked My Wife's Big Sister... Hibiki Yonezu

The relationship between my wife and I grew more distant with each passing year. Then, the other day... she finally refused to have sex with me. Had we ceased to be a man and woman in our relationship? No, there's still time... It's game over if you give up!! Returning home after a company drinking party, I gave in to the power of alcohol and nervously made a move on my wife, who was sleeping on the sofa as usual. But although her face was hidden by the futon, the woman wearing my wife's pajamas was actually her older sister (sweat).