Sounds like you are close enough as a couple that you can (or should be able to) talk! Tell him what you want! What I mean is...tell him you want HIM to come up with a scenario to take it to the next level. Something that will make a whole night of it. There are so many possibilities...public humiliation...chastity belts...candle wax (if you haven't tried that yet).
I'll be honest with you here..
In my relationship my g/f sub is very "open", but hesitant to tell me her limits. Because I worry about going too far, I usually don't go far enough. I would really appreciate her telling me exactly what she wants. Instead I am having to discover it the hard way. Maybe your Dom feels the same. I have thought about asking her to write out her "wildest sex fantasy" LOL! Although from what I've seen so far, I'm almost afraid to read it!
I just kind of perked up when I read your post because I saw the "hint" reference. We spend half our time hinting around to each other and the other half acting on it. I wish she would just spit it out! (No pun intended).