"A Little Hero AU where the Marvel universe characters get their starts as kids!" Teen Avengers - Iron Man, Captain America, Thor, Black Widow, Hulk and Hawkeye. Click through for their adorable back stories. Why is Thor so young?
So, I'm not really sure if I got it right, but I'm guessing Bucky is so cute that it got Steve flustered? --- Not exactly hehehe! Clint might have instructed Bucky in the gesture of the "fierce" sign and everyone thinks it's absolutely hilarious!