I find it interesting that many a hero-villain team up starts off with some variant of;
I don’t need you but you need me. So if you hope to get out of this situation only slightly worse for wear than play by my rules.
And then there’s Barry and Len in the CWverse:
Barry: I need your help
Leonard: Oooh boy, buckle in kid. You’re in for a world of hurt, asking a villain to help you outright like that.
Barry: so your sister says you need help
Leonard: …. despite myself, I’m concerned for you and your judgement calls
Leonard: I’m not helping! Totally not helping. Just some normal villain posturing here. I even broke into your house to prove I’m being evil.
Barry: thanks for the help Len. :D
Leonard: …. despite myself, I am concerned again.
Barry: I need your he-
Leonard: You’ve already inspired me to play hero, GO AWAY.
Barry: -lp to steal something.
Leonard: I’m in.