How to masturbate in front of your partner and not make it awkward?

I'm 20F, and I have a boyfriend 21M. I really want to try this thing with masturbating in front of him and have him watch in a bit of a dom/teasing way. We have an under-mattress harness thing, which we use to tie each other up so I was thinking of integrating it somehow to make it more kinky, but I feel like it would just be awkward. Like me just sitting there and wanking and he's just watching hahhah. Is it actually awkward? Maybe it would seem more sexy in the heat of the moment? Any tips?