I've been married to my wife for five years. Occasionally, my wife's younger sister, Luka-chan, comes over to our house to play. The other night, I had a bit too much to drink at a company drinking party... and in my drunken state, I tried having sex with my wife, who was sleeping in the bedroom. When I woke up with a hangover the next morning, my wife and her younger sister were side by side in the kitchen preparing breakfast... 'I might have had sex with my wife's younger sister last night instead of my wife.'
