I have seen this so many times that I think I have it down cold. I think it goes something pretty close to this:<Fill in name here> and <Fill in name here>,
We hope that you are enjoying your stay in <Place that they are staying in>. If you decide to forego your individual rooms, you can use this key to stay as a couple in the fantasy suite.
I hope I got it right but hopefully someone can correct me if I am wrong.