My wife and I have been married for five years. Occasionally, "my wife's little sister" Luka-chan comes to visit us. The other night, I drank a little too much at the company's drinking party. When I woke up with a hangover the next morning, my wife and "my wife's sister" were side by side in the kitchen preparing breakfast... "Maybe the one I held last night was not my wife, but my wife's sister..."
