It's hard to come up with things, without knowing much about the person concerned. I like to do my research first & learn things like how inhibited you are, what clothes you wear, what your collection of sexy undies is like & what's OK & what's a turn off.

Are you going to a restaurant for his birthday? Two options off the top of my head- wear a skirt, not too short...go to the ladies & take your panties off.
Make sure they're sexy ones.

Come back to the table with them in your hand & slip them into hubby's pocket- drop them on his lap if you dare.

Depending on how daring you are, put on a breast harness made from soft rope- make sure it's not a halter design so no one can see it. (Got to watch those ropes around the back of your neck in public)

Wear a button up blouse. When you're in a public place undo a button or two, & give him a peep at the harness.

You could also do that at home with friends around.

Anything else I'll have to share in private- certain young ladies may be reading this, I don't want to give away all my secrets!

Tojo