Pick a superpower that you'll have for the rest of your life, and a ticklish spot on you that'll get more ticklish every time you use it.
(You can't say no spot, as that means you have no powers.)
And this will to be an interaction between the both of us if you happen to say "You know what to saaaaay" one more time, or try to make me "safeword" again. 🤣
And for the spot, I actually was going to say no spot, but fiiiiiine.
I'll go with the hair on my left eyebrow.
Non-bratty actual answer: The masochist/slightly smart part of me is actually going neck or ears, because I don't think they can get much worse than they already are.
And I know you're not a lee so you don't need any, but I'm honestly curious what superpower you'd pick, even if it's to specifically counter mine.