I don't think it's realistic for most people, as much fun as the thought of making someone a one-note fixated drone is! But really the answer is just mindplay in general. The presence of mental domination is, itself, the most important kink for me. Everything else is extra and can be swapped out.

That was my original answer, but now I'm not sure if you mean this more in a "Oh, you always liked [kink]" kind of way. In that case, it's probably convincing people they were always really eager to mesmerize others. ;)