Start by just talking about it. Tell him youre interested in trying it and want to know if he might be too and then have a conversation about it. Then, if it's going well and he wants to try it, start doing homework about techniques, beginners things to try and safety. A very common mistake that beginner couples getting into rope play can make is that they don't do enough research about the potential to cause permanent nerve damage tying each other up. You could try to get on fet life and look for rope/suspension/shibari events near you to find people you can learn from. There are also a few BDSM educators on youtube. *Not trying to solicit anything* but just as an example, you could look up Epicrope tutorials on YouTube, evielipine's videos or Morganthorne's videos. There are also all kinds of educational books about this kind of stuff and sometimes just going to your local sex toy shop is a good way to find books about it.

Just talk to Him tell him you want to “add a little flare” and suggest using a tie or something. I’m sure he’ll love it guys always love it when their girl wants to get freaky 😉