Fic: I Can't Believe for January challenge

[jettblack0110.livejournal.com]

Title: I Can't Believe
Rating: R
Warnings: Language and adult content!
Summary: Why did Nick leave when things were just getting heated?
Spoilers:  Teeny ones for Play With Fire, Viva Las Vegas, No Humans Involved, and Who Shot Sherlock?

Written for the January challenge

( This way to Nick and Greg goodness )