OK, I did finally have a go at this, I'm the anon who originally seconded the prompt. I hope the OP is still tracking this. I'm going for brotherly love but, of course when the brothers in question are the Holmes brothers that might not be an overt demonstration of brotherly love :)

I've put it up on AO3 what with the pages getting a bit full on here!

Getting Out (http://archiveofourown.org/works/340889)