Prompt: How does Lanie find out about Caskett?

So this takes place pretty close after 5x04 Murder he wrote.

ging person he's met and right then, he didn't care at all.

"Are the boys right? Are you really seeing someone?" Lanie asked before taking a sip of the glass of merlot in front of her.

Beckett nodded sheepishly before hiding behind her own glass of wine.

"Who?!" Lanie exclaimed excitedly, setting down her glass and swiping her hand across Kate's arm.

Without saying a word, Beckett shook her head softly, indicating her silence on the matter.

"You're not telling me that you've moved on from Castle? I've got money on you and Writer boy finally hooking up."

"Money against who?" Kate questioned, she too put her drained glass on a coaster.

"Javi is truly a betting man, he'd bet on a New York winter if he thought it wouldn't freeze every day."

It was one of the first Saturday's where Kate wasn't on-call and, despite Castle's pleas, Beckett needed some down time with Lanie. It had been ages since their last girl's night. Regardless of her insistence that the 'Caskett' relationship should remain secret, Kate knew that she had to spill some of the feeling that overwhelmed her. Lanie was obviously her go-to choice for 'secret spilling.' The Detective was confident that if she expressed how dire the consequence was that Lanie would no doubt keep her mouth shut.

"Well, I'd rather you didn't collect your winnings from Espo, as we are attempting to keep this quiet until the situation becomes ideal," Kate grinned nervously, waiting for her best friend to clue in.

"NO WAY! NO WAY!" Lanie leapt out of her seat, startling Kate. Girlish screams of excitement bubbled out of her. "Finally! When? Where? How?"

"It was the night that I quit, I decided that I needed to stop wasting my life and start doing something worthwhile. I wandered around and ended up at his place. I arrived, soaking wet, with one desire and, I'm telling you the truth here Lanie, my desire was satisfied, three times." Beckett let out a totally un-Beckett giggle.

"Katherine Beckett! You're kidding? I always assumed he was just over confident, I assumed those blonde bimbos were boosting his ego." Lanie's mouth was still wide open as she sat down, a slight fold to the corners of her mouth.

"So did I, but, nope. That man is… Amazing. No doubt the best I've had. If you tell him Lanie, I swear, it will be the last thing you do," Kate threatened before she blushed like crazy.

"The best!?" Lanie was stunned. "Are you sure he's actually good or is it just that you love him."

"I don't know but ever since that night, everything's been better. I don't know why it took us so long?"

"You're preaching to the choir honey," Lanie grinned. "I'm just so happy! Finally my best friend is with her soulmate."

"I just can't get over how good the sex is. I mean Demming was good, a little vanilla if I had to admit. Josh was better but there was never any spark, you know? It was always just physical," Kate explained. "But, with Rick we've always had this connection and when it finally happened it wasn't really a spark so much as a firework. He just knew." Lanie chuckled to herself, of course she knew all of this. She would never mind just listening to Kate bubble about her love life, especially since it involved Castle. "You know that one guy you dated for a bit during the off time with Espo? You said he was great but you never felt it because you were 'spoiled by Javi.' That's how I feel. I know that no other guy would ever do it for me now, and I don't want anyone else. And Lanie?" She turned to face Lanie, putting down her refilled glass and folding her legs up on the couch.

Lanie perked up, turning to cross her legs also and if anyone else saw they would have looked like a pair of school girls sharing gossip. "Go on girl, say it."

"I… I don't want anyone else… ever! Lanie, I… I think I want to marry him. I want Richard Castle to be my 'one and done."

"Of course you do girl!" Lanie patted Kate on the shoulder. "You love him! You want Castle's babies!"

"I do, I want to wear a big ol' white dress, and I want to meet him at the end of the aisle. I want to tell him that 'I do.' I want nine months of carrying his baby, I want pre-school and parent-teacher conferences. I want to grow old with him, I just want him."

"Have you said it yet?" Lanie asked and Kate looked puzzled. "Have you told Castle that you love him?"

"Not yet, I'm not ready. I know I want it but I don't want it yet."

"Fair enough but if you don't tell him soon, you might lose him. And no offence Kate but, I don't think you could handle losing him. No way would he be able to handle losing you, not again. You two are meant for each other, remember that."

"Trust me Lanie, I'm not letting him out of my sight. And on that note, my boyfriend has been incredibly patient and I think you'll find that I owe him a little something," Kate winked as she departed from her goodbye hug.

"Ooh, way to go Kate! You go get your man."