Castle & Beckett are in LA investigating Mike Royce's murder. This is my take on what might have happened in Season 3, Episode 22, if Castle was still on the couch when Kate came back out of her room in the hotel suite. Mature Audiences only please, NC-17 content.
An extension of episode 4.13 - Scully is feeling down and embarrassed after what happened with Ed Jerse. Mulder isn't helping with his sarcastic comments. She leaves the office, he feels like a jerk. Mulder ends up at Scully's place later that night, trying to fix the hurt he caused, and profess even more. Is Scully in the right place to accept his apology and his confession?