Prompt from 41319Vic here on fanfiction . net: Can you write a story where castle is playing with their children and doesn't know Beckett is watching
Kate reaches the top of the stairs and makes her way down the hall. She hears voices when she gets close to the playroom, so she slows down and peeks in the open doorway. When she is sure that Castle and the kids haven't noticed her, she takes a few more steps and leans against the doorjamb with her arms crossed. She smiles when she realizes the three of them are having a tea party. They have a blanket laid out and are each sitting on one side, with the fourth occupied by several stuffed animals. The topic of conversation is if dachshunds were bred with Great Danes, could the resulting breed of Great Dachshunds win a battle against robotic unicorns. It seems that Castle and Sara think the dogs would win, with their superior height and length, but Lincoln is adamant that the metal unicorns would be victorious. Every so often Sara offers her father and little brother some more tea, and fills their cups when they need her to. Castle keeps reminding the kids to drink with their pinky out, so they can be fancy. It takes Kate a while to realize that all three are wearing dresses of some sort. Sara is in one of her princess costumes, Lincoln is in another, and Castle has a sheet wrapped around him. By now Kate has forgotten what she came up here for, but as the smile on her face continues to grow, she figures it wasn't important enough to interrupt her family anyway.