u/Annananananam

So me and my partner have been together for about 8 years. I love him very much and would never want to leave for any reason other than the obvious. I’ve noticed off an on that I have been having dreams and thoughts about one of his friends. We know him very well and have spent a lot of time together over the years. We’ll call him v. these thoughts have never been of a romantic nature but more so of a sexual one. We’ve never slept together but I keep catching myself thinking about what it would be like. I would like to stop thinking this way because for obvious reasons it’s wrong but I’m not sure how. He’s a very important aspect of our friend group so it’s not like I can just avoid him and to be honest I’m not sure why I’m so drawn to him. My sex life with my partner is fine. Nothing special but it’s not like I’m complaining about it. Has anyone had any experience with this sort of thing? Will it just pass over time or is there something I can do specifically to stop this from happening?