Teasing always has had an undercurrent with the pair of them. There's always been something more to them, than just assassins and now teammates. It's been there since the beginning. He could have killed her, in Odessa. In DC. In Vienna. Each time, he didn't. He'd hurt her, and he'll spend his life making amends for that, but he didn't kill her.

He leans in and kisses her hard. Yes, yes he does want to. A lot. He holds out his metal hand, to her, needing her to take it, and him. He'll follow wherever she leads.