"Because, let's be honest, you're wasting your talents at S.H.I.E.L.D. You're a super human and the Avengers would give you more opportunity to shine. At S.H.I.E.L.D. you're an agent. One of a thousand. On the Avengers you could make a difference," he answered, calmly. Of course there was more to it, their relationship or whatever the hell it was, but in Nick's mind the reason he'd just given was the best. And of course he'd contemplated it the most, far more than the fact that one day he thought having her around might get him distracted and killed. Nope, not that reason at all.