How to get my vanilla guy to be more adventurous?

My man is very vanilla and isn't kinky. I love him but would like to spice things up in a way that wouldn't make him uncomfortable. Any suggestions for things I could suggest that we try that wouldn't be too out of his comfort zone? He enjoys fooling around in public and giving the occasional spank. That's pretty much as adventurous as I've seen him so far. He assumes that I am more vanilla than him and I'm a bit shy to bring this up since one thing he finds cute about me is my innocent and shy nature. I have zero sexual experience compared to him but have more kinks than he realizes. While I know that he would be accepting and is willing to try things at least once, he also knows that I am uncomfortable talking about anything related to sex. Due to this, I get terrible anxiety verbalizing new things we could try together.