Dean/Castiel D/s universe
I read a story on archiveofourown a few years back but haven’t seen it since. It’s set in an AU where everyone is either Dom or sub and Dean is forced by John into an arranged marriage to Cas. Dean’s not a traditional sub though and pushes back a lot which Cas likes and there’s a bit where Dean can’t be forced to submit to Cas’s brother who is a dom (think it was either Zachariah or Uriel) which embarrasses him. I remember there’s a scene where dean pulls a gun on Cas their 1st time and demands he has sex with him as he made him wait too long and I also remember it ending with Cas bottoming as a wedding present or something.