This story starts from the middle of season six and is basically a collection of Scully's diary entries. The timeline and dates are probably way off, so just ignore them ;)
Feb 23rd 1999
Well, it's my birthday. I don't know why I was hoping this year would be different, but it's the same old story. Work, dinner for one, bath and bed. One year, I want to actually go out and celebrate with someone. My mom is visiting Charlie for a few weeks so couldn't do anything with me, and the only other person I would want to spend my birthday with probably spent all evening lying on his couch watching baseball. I can see the coming week is going to be a nightmare – Mulder and I start a case tomorrow out in California. We are going undercover… as a married couple. I know, I know, it's going to be tough. I think Mulder is secretly looking forward to it though, I mean what XFile doesn't he look forward to? Although he isn't convinced it's an XFile, but when Skinner assigned the case, it was just a welcome relief to be away from desk duty that we jumped at the chance to have a trip to the west coast. Mulder chose our undercover names, and my god I am never letting him do it again. Laura is bad enough, I just hope he doesn't call me anything inappropriate in front of any of our suspects this week, let alone touch me! We have to act married for god's sake, I can't have him making me go weak at the knees! We have to be believable and no doubt public displays of affection are going to be in there somewhere. I thought this would actually be a case I could get on board with; spending a lot of time with Mulder is good compensation for the shit I will no doubt be putting up with this week. But, I have to admit I am kind of dreading it. I have a horrible feeling that this will be the case that finally breaks our resolve. Our silent agreement to one another to behave appropriately at all times, no matter the feelings of our hearts. Well, that's what I have promised myself, I can't speak for Mulder on that. I am going to be on edge this week having Mulder living in the same house. I know we've shared motel rooms in the past and he's stayed at mine on occasion when we have been up late going over case files, but this is a whole new deal. Undercover. Married. Jeez, wish me luck!