GFE doesn't have to be long term. It just has to feel like something you would get from a long term SO, and may only last the hour that you and the WG are together.
CIM is just part of the job to many WGs and does not = GFE IMHO.
I've had many SO's that loved CIM and swallowed everything I could give for years, and just as many that didn't like it. For those who didn't like it, I just "accidentally" CIM every once in a while and laughed about it with them afterward. I still got great GFE from them as they were in fact my SO.
Now when they let you completely plaster their face with cum... that's GFE!
JK... it's really just PSE