You should definitely check out dustandroses' fic Tuesday and its sequel Another Tuesday. Both are O'Reily/Ortolani, a lot darker than my series, and incredibly well-done.

You may also want to request recommendations for Season 1 fics over at oz_interaction. I think there are a few O'Reily/Beecher fics out there, but some of them are post-series (so if you don't want to be spoiled, ask for s1 only).

Glad you're hooked - IMO, Season Two is interesting, S3 is excellent, and the first half of S4 is phenomenal. Enjoy!