Buffy getting married

[ladyhatshepsut.livejournal.com]

 I'm having vague recollections of a Buffy/m crossover story and I can't recall who the hubby was or what fandom he was from.  I remember that he had a similar lifestyle; trying to fit periods of a normal life in between bouts of extreme violence against the bad guys.  I seem to remember Buffy and him warning his people (family?) against any violence during and after the ceremony and going out very early that morning to back up that threat with violence.  I have the thought that they got to the church just before the scheduled time and Buffy still having weapons (guns, I think) underneath the dress.

I've been trying for two days to get a visual of who she was with, but I got no face or name.  Any help, anyone?