Gym Issues

After struggling for a bit of confidence recently, I decided to join my local gym. My husband is not the jealous type so he doesn't mind me dressing rather sexily when I go and he encouraged me to go without him. Now for the issue...a guy seems to go at the same times I go every week and he is very fit - to be quite honest he makes me very horny with how big and strong he is. I have never mentioned him to my husband but it is really troubling me as I can not get him out of my head. My fantasy is that my husband knows him and has arranged it all in that he wants me to be seduced by him. I would love for the gym guy to turn up at the dinner table one day and my husband to say he wanted me to be happy by fulfilling my sexual desires.