Hothead and Rational

Not sure what this trope's called so I just put that in the title, but I'm looking for books where the two MCs are long time best friends who work together on almost everything. One of the MCs is a cocky, overconfident and rash person while the other MC thinks before he acts and takes a rational approach in any situation. Not that the cocky MC is dumb though, he just prefers to take action before anything else. Also, I'd like them to be kinda clueless of their attraction to each other since more intimate actions are just the norm for them.

Preferably Historical, Fantasy or Science Fiction but Contemporary is fine too.