If you are involved with anyone else, don't write the story. If you are not involved with anyone else, write it if you like, but change your name and his name and any other details that might identify your wish-fulfillment story as being about him. My guess is, a few paragraphs into it, you will feel like it's too foolish to continue, but who knows. Just don't commit to paper something that would embarrass you if it were printed in the employee newsletter.
So, did you just get out of your marriage like . . . . yesterday? Okay, not yesterday but just recently. That will make any relationship you start now have a shallow foundation because you haven't processed your previous relationship. Overlapping relationships usually means we make all the same mistakes we made previously. To me, and I say this with kindness, you sound unhappy in general and a man is a band aid. I work on you and fixing and improving your own self, do some self reflection, find peace and happiness that doesn't require a man to be involved and you will be in a much stronger position to have a solid relationship down the road. good luck