Kate walked through Castle's office, a broad smile covering her face. "Hey, babe. Are you working on your class again?"

Castle gazed at his beautiful wife, still surprised after over a year of marriage that his heart beats wildly when she walks into a room.

"Yah, being a regular professor at the college has been more fun than I expected."

Kate leaned over and laid a kiss on his cheek, then stared at the screen. "What's the topic today?"

"I'm telling the students how easy it is to ruin a story when you make poor choices with the ending." Castle moved his notes over his desk, making room for his wife to sit. He thought that she might be a good person to test his notes on, see if what he's trying to say gets across to her in the correct way.

"How do you ruin a story?" Kate asked, clasping her hands together as if in a classroom, ready to learn.

"For instance, if I wrote one of the greatest love stories of all time, it would be important for me to preserve that relationship…correct?" Castle eyed his wife, knowing that they had one of the greatest love stories of all time.

"Of course…just like us." Kate said, echoing his thoughts.

"But what if in the last chapter, I introduce a female character that decided she needed to watch over the male character and his family, but not his wife?" Castle pointed out.

Kate has a look of confusion on her face, "That sounds like the female character is trying to have an affair with the male character."

"No, she isn't. But she randomly shows up and still inserts herself into his life. There isn't any love there, but she still plays a significant role in his life." Castle says.

"But, isn't it the wife's role? Doesn't that mean that the female character is trying to replace the wife?" Kate asks.

"That's my point. A random character placed in there with no purpose can disrupt a love story because it shifts focus on what you want the audience to be reading." Castle took his wife's hand, "In any love story, I want my audience to focus on the two most important characters."

"Babe, I actually think that's a little thin even on the lesson side. I mean, would any author really insert a female character for no reason? I mean it would make more sense if she was inserted to take the place of the wife, because then she would at least have a purpose and people could be mad at her. But for no reason? No writer would even try to do that, would they?" Kate pointed out.

"You have a good point, honey. Maybe I should talk about how putting space between characters at the end of a great love story is the most detrimental?" Castle proposed.

"That would be sad. I would never reread a book series where the whole point of the first…say seven books, was a love story and then in the last book…they destroy the story." Kate suggested.

"That's a good idea. Maybe I'll focus on a book series and how you have to be careful with your characters in the series. I had so many people tell me it was hard to reread Derek Storm books after he was killed off. The same would be true if you destroyed a love story in the end of your book series." Castle gazed at his wife, thankful for her input.

"But Castle?" Kate bit her lip. "Our love story is safe, right?"

Castle pulled Kate into his lap, "No worries; honey. No writer worth his salt would destroy what we have."