How to tell my bf what I like...

So I’m really sub and I have this amazing bf who I think is willing to try out being more dom with me. He’s already done some things, like calling me ‘slut’ and dirty talking and spanking me, but he did those on his own and I didn’t have to tell him explicitly that I wanted them. I don’t want to be selfish, because I really appreciate all the effort he’s making for me, because this wasn’t something he’d ever done before. But I have some other ideas of things I’d like to try, like being tied up or having him tease me instead of just going for it or letting me call him daddy, and I don’t know how to ask to try those things without a) making it seem like all the stuff he already does isn’t enough or b) getting too embarrassed because it’s hard for me to talk about my kinks with other people face to face, and I don’t think this is a texting conversation. Any advice/thoughts?