I don't usually do this during action movies, but I spent just about every second while Natasha and Clint were on screen kicking ass (each others and other people's) going:
Especially amidst the rubble/carnage. It seemed very appropriate- especially because he kept throwing out adorable pet names/nicknames for her the entire time. (Which in my head immediately means that she's the one drawing lines in their relationship, not him. Awwwww.) Also there is a lot of
very pretty Natasha/Clint fanart/etc floating around tumblr. A few examples: