Disclaimer- I don't own Castle. My first foray into Castle fanfiction, so please be nice (I hope)! Special thank-you to my beta, hotcookinmama, for helping me polish this piece and pushing me to actually write it! Check out her Arrow fanfic! If you want to see who I'd cast for Kate's little sister, it would be Merritt Patterson.
This vignette takes place during Flowers For Your Grave, the pilot episode.
As she got into the Crown Vic to drive home for the night, she dialed a familiar number on her phone. It rang. She was expecting it to go to voicemail, but instead, the line picked up.
"Katie?"
"Hey, Ali," Kate said, surprised her sister, Alison Beckett, answered. "I was expecting to get your voicemail! I'm surprised you picked up!"
"Yeah, I've got a minute, I was just going home from the law library. Am I forgetting something? Oh no, the dinner with Dad- it wasn't- it wasn't tonight was it?" Ali's voice started to rise in pitch.
Anybody else would have immediately tried to calm her down. But Kate absolutely relished moments like these. "I was just calling to see if you were on your way," trying not to let the grin on her face come through her tone.
"Oh no! I promise, I didn't forget! Oh my God, did I record it wrong in my calendar? Just a second, I honestly thought it was tomorrow night-"
"I'm messing with you, Als," Kate said, grinning to herself. "It's tomorrow night."
There was a long pause. "Katie, that is not funny," Ali said darkly.
"It was hilarious to me."
"I'm sure it was. You are such an ass."
"I know. I was just calling to check in with you," Kate admitted.
"I should hang up on you for that," Ali said. "My study group just finished the dissertations from the Legal Ethics class, and I've got work at my internship tomorrow morning. Anything exciting happening your world?"
"Well… you know those books I got you hooked on?"
" Gone Girl ?"
"No, the other one-"
"Not the DaVinci Code ? That was so long ago-"
"No! The Derrick Storm novels!"
"Oh! Yeah, I know those."
"Well, you are never going to guess what womanizing author I had to take in for questioning over a homicide today."
"Shut up! No!"