Etiquette and Refusal (The Barton Guide to) (смешанная)

For this prompt:
I see a lot of fics where Clint is Coulson's sub and I love them, but it's always Coulson coming to the rescue when Clint is bugged by another Dom. I'd like to see a fic where Clint is violent to Dom's that aren't Coulson touching/petting/etc him.
I know it's not proper etiquette for subs to behave that way, as it would reflect badly on the Dom, but I just can't see Clint allowing any ol' Dom to even have contact with him.
In which Coulson and Sitwell are both in relationships that have a certain amount of excess, but only one of them has a problem.