spikedluv does a lot of Don/Colby as does, I think, sour_louise.
Disclaimer: I'm not a Don/Colby fan, so I can't vouch for the quality of that fic. I'm just mentioning it in case you like that pairing.

BTW, if you want people to self-rec their own fic it would help to edit your post to say whether that's okay or not. Many people are reticent to mention their own stories when a poster asks for recommendations, not just where to find a certain fic.