Haha at this point Billy is used to every weird thing that this place can throw at him...i say this and now something will happen to break his brain.

Hawkeyes are rarer I've noticed. Poor Clint. As for headcanons, mostly they're best friends and he knows the most about her. She's still Natasha and will always have secrets but she has the least from him. And when it comes to intelligence info basically what Clint knows Nat knows and vice versa. Other than that I haven't really explored much with them so I'm looking forward to playing with her. :)