He knocked at her apartment door, patiently waiting for her to open. When nothing happened he knocked again.

„Coming" shoutet Kate Beckett from inside the aparmtent and only five seconds later opened the door.

„Hey Castle, what do you want?"

„I know who the killer is!" Castle answered excited and moved to enter the apartment but Beckett blocked the door.

„Listen Castle, right now is not a good time. Call Ryan and Esposito to pick whoever the killer is up."

Castle noticed only then that she looked really tired.

„Ka-" he started but was interrupted by a cry from inside. He threw a puzzled look at her. She sighed and opened the door wider to let him in.

The first thing he noticed were the toys that were spraweled all over the couch and floor, the second thing was the crying child sitting in between them.

Kate went over to pick him up and calm him down.

„Hey Johnny, can you stop crying to say 'hi' to mommy's friend?" She asked him silently.

Castle still stood in the doorway, shocked, staring at the boy in Beckett's arms. Johnny shook his head stubbornly and burried his face in his mother's neck.

„I'm sorry, he's been sick the whole day. Should probably sleep anway..." Kate trailed off with a knowing smirk. Johnny's head shot up.

„I'm not going to bed, Momma"

„Ok, then say 'hi' to Castle."

He sighed loudly and then turned in his mother's arms to look at Castle.

„Hi, I'm Johnny. You're Castle, right? Momma talks loads about you."

Castle had a huge grin on his face.

„Does she now? Beckett, I didn't know you liked me that much."

„Who says I talk about you becaus I like you? I always complain because you're so annoying!" She defended herself but the damage was already done. Castle couldn't stop grinning.

A/N: This is my first story ever and I hope you like it :) The chapters will be longer soon, this is just the beginning :) Hope you enjoyed it. Also sorry for any mistakes, English is not my first language.