The way they smile
Can someone gather a gif set of these two just smiling? Sometimes it’s subtle, yet so special because whenever they’re together that’s when they genuinely smile. Sure, Natasha probably smiled plenty in Iron Man 2 and maybe a few times at the beginning of The Avengers but that was when she was undercover or simply doing her job as a S.H.I.E.L.D. agent. Side by side, they are just true and sweet.