Rimjob Gouch

So giving a man a rimjob and licking the gouch area is always something I have fantasies about all the time. I see a lot of you all on here say that once you did it your SO went crazy and absolutely loved the feeling.. well I will be having a sex session with a guy I’ve been fooling around with a couple years and I am going to try it while I’m giving him a blowjob I’m just afraid he want like it and it doesn’t have the feel good affect on him 😫 any advice p.s he’s totally unaware