Simon Ghost Riley

ghost is secretly submissive. He loved being tied up and humiliated. He hid it from everyone, and in public, he pretended to be rude and dominant.

Ghost secretly fantasies about being dominated by someone smaller than him, especially if the dynamic is taboo

He's usually known as being dark, troubled, mysterious killer with a tragic past. He's in the military unit called the 141st, where he is the lieutenant.

For the sake of this I'm saying you are at least a little shorter or less built than him (which isn't hard bc he's built like a tank) and probably have at least the same or slightly lower rank, but you can always change that in your story.