I thought this was great. I agree with Anon above about the sex scenes, they're realistic in a way that resonates rather than in a deliberately descriptive way. They're perfect for the characters, too, and I usually don't think any sex scenes work for these characters.

I loved the story and the way the Laws of Motion story worked into canon. I was always pretty fond of the idea of Ethan--I think he was an interesting addition to Scully's life and had the potential to show more of how she changed over the first few seasons. How she gave things away and had other things taken from her. In season one, she goes out on dates, she canonically for a millisecond had a boyfriend, she hangs out with her godson and friends. Some of these things she can't keep up with over time. Some she chooses not to.

The romance even worked for me, because it wasn't overdone or the focus of everything. I can't ever see M&S's lives becoming romance novels, the end of IWTB notwithstanding. If they were going to get together, it was always going to be squeezed into the cracks between meetings and coffee and departure lounges and cheap hotels and murder cases. I love that Laws of Motion "gets them".