I’m looking for some insight or creative ideas for a title or name to call a sub who is very well-endowed. English isn't my first language, and I'm even less knowledgeable on the sexier lingo.

The dynamic we have relies somewhat on the contrast between. He is physically imposing, older, taller than me, and very hung, but he is completely submissive, and he really, really, really enjoys when I acknowledge his submissive side and his endowement.

He calls me "Sir," which he loves to say and I love to hear, and I would love to find a title for him that carries that same weight but in the other direction. Maybe something that objectifies (is that the right word?) in the way he likes, validates him, or just reminds him in general that his size and submission is appreciated. We have a softer/more affectionate dynamic, but he's open to any name, i.e. a harsher name isn't out of the question.

I'd really appreciate the help!