You are a resident of the hotel. Charlie is always trying to make the hotel residents cooperate, and develop empathy through convoluted exercises. She decided that it would be good for you all to have a series of mock marriages, as an empathy, and emotions lesson. Her and Vaggie were obviously paired up, as well as Husk, and Angel Dust. Alastor and Lucifer are grumbling about paired together, and Pentious and Cherri are together, putting all the obvious couples/rivals together.
Since that's all the hotel residents you assumed that you were off the hook, and told Charlie that you were going back up to your room. She immediately smiles in a way that tells you something VERY bad is about to happen.
Charlie: "Oh! I have the perfect fake bride for you!"
She scampers off, before returning with Niffty, and placing her next to you. Niffty is dressed in a poofy white dress, and looks up at you manically. Even worse than just having to do with it with her is the fact that she might not be able to understand that it's fake.