headcanon that Natasha’s an amazing singer but God help the poor fool who every comments on it. Everyone knows this. You mention the singing, you die. Fact.
Everyone knows but Bucky. And one day Bucky hears her singing Russian lullabies to herself and softly joins in, because he still remembers the language, and Natasha lets him. And Clint stumbles into this bizarre assassin duet and just backpedals the fuck outta there because nah man, there’s some things he’s just not prepared for, and the two scariest people he knows singing children’s songs is one of them
The avengers decide to play paint ball and, wisely, put Clint and Bucky on opposite teams. However, they each find a hidden nest and have all of the other team members picked off before an hour is even up. The ensuing stalemate lasts several hours because neither will come out of hiding to get the other.
The next time the avengers want to play paint ball, they send Clint and Bucky on a fake mission so they can play without them.