It had frightened him to see Tonks cry like that because he'd never seen her cry before, not even when they had watched Titanic together and she had declared it the 'single most horrible, gut-wrenching movie ever'. He couldn't understand then, why something as trivial as himself had reduced her to a teary, blubbery mess.

They were Strike Team Delta long before S.H.I.E.L.D stepped in. Natasha and Clint, and how they became two of the world's most deadly assassins. Completely AU.