I'm thinking of a fantasy that was fulfilled and now I can't get enough
What was the fantasy that you are thinking of and can not get enough of.
I can't tell you in a few words, it's very complicated.
Having your fantasy fulfilled feels great, doesn't it? You should use this as motivation to fulfill more of your fantasies.
I'm done with all my fantasies and now I crave for more.
It is good to pursue your fantasies, just don't get to wrapped up in them and neglect other things.