Prompt from bones35 here on fanfiction . net: Kate comes across Castle's diary.


She hadn't meant to find it. She certainly hadn't been looking for it. But here it is, in her hands, and Kate is torn between wanting to open the dairy and read every word and wanting to put it back in the drawer and pretending she'd never found it. To read it would be such an invasion of Castle's privacy, and she knows that if it were the other way around she would be extremely upset if someone, even her husband, read her personal thoughts. She runs her long fingers over the smooth leather, thinking about how Castle's hands have held this book, how he's put down his innermost thoughts just behind the plain brown cover.

They no longer keep secrets from each other, that's a thing of the past, they are so much better at communicating now. Because of this, Kate can't help but wonder what would be inside, since he tells her everything. Surely he isn't secretly hiding things from her. No, she trusts him, knows he wouldn't do that. Even so, if he's totally open with her, as he appears to be, what would he need a diary for? Maybe he just writes down things in here in addition to telling her, or maybe it's just a place for ideas for his books.

Kate lets out a long, loud sigh. No matter what's inside, she can't do this to him. She can't break his trust in such a way, she just can't. In fact, she doesn't want to. Whatever is in the diary isn't worth causing a rift between them. A few years ago, she wouldn't even have hesitated to open it, but now things are different. She's going to ask him about it though, tell him she found it by accident. She'll tell him that he doesn't have to tell her what's in it, but she knows he will, just like he'll know that she was tempted to read it but didn't. Her mind made up, she slips it back where she'd found it in and closes the drawer, then goes to look for Castle so they can talk.