I've been married to my wife for five years. Sometimes, my wife's younger sister, Luca, comes over to visit us. The other night, I drank a little too much at a company drinking party... I came home drunk, and for the first time in a while, I tried to have marital relations with my wife, who was sleeping in the bedroom... The next morning, I woke up hungover, and found my wife and "my wife's younger sister" preparing breakfast side by side in the kitchen... "Maybe the person I held in my arms last night wasn't my wife, but her younger sister..."