Wife wants regular to move in

We've known or have had a regular for my wife for 7 years now, off and on of course. He moved away a few years ago but when he came home to our city, he'd always come over. Well he is moving back to our hometown at some point but when he does, wife wants him to move in. I'm totally down for this as you may know. Id just like to know if others have ever done this and how it turned out. whats your experience.

Long evolving story but My Dad who Fa-thered a ***** with my wife eventually moved in and he had Her as His Wife.