Sup y'all.

A big anniversary is coming up for me and my Master, and I want to give Him something extra special as a gift. This year was a big one for us as we moved in together and everything has been perfect so far and I really want to show my appreciation. I am collared 24/7 and absolutely love it. He expressed interest in like a "permanent mark" for Himself, too, to wear His connection to me out and proud, similar to my collar. Something He can put on and off Himself as He pleases, of course.

He already has a necklace with the key to my collar, and He loves it, He wears it when we go out together, but He works a physical job so necklaces, wristbands or rings are not an option all the time as they are not permitted at His workplace since they can get caught in machinery and no one wants to risk that.

Does anyone have any ideas? The only other thing I can think of are anklets but neither of us like the look of them. And He does not want any tattoos at all ever, so also not an option.

Anyone in a similar position with any ideas?