Time Frame: A few years or so after both BtVS & AtS finales. Uses no canon after that.

Rating: T-Mature (cuz Faith still curses like a sailor)

Legalities: All B:tVS characters are that of the Mighty Whedon and his glorious intellect & Castle is the property of ABC. This work is meant only in celebration and nothing ulterior

Chapter 1 - Foreshadow

Richard Castle and his daughter Alexis both gave long worried looks at the bathroom trash bin. Another door knob replaced after the last had been disfigured, crushed by the smallest hands in the house. Her ginger hair was nearly orange in the bright light of day spilling from the window. Barely sixteen and filled with wisdom beyond her years, she knew this was not a normal part of the whole 'when a girl turns into a woman speech.' This was something completely different.

"Maybe it was just a bad door knob." Alexis threw out there. Her eyebrows knitted hearing the words herself. Her father made the same face.

"One bad door knob is plausible. Two though," The weary father shook his head "points to the person using the door knobs, Alexis." They both looked crestfallen. What was going on?

The day dragged on and Castle's phone stayed suspiciously quiet. No calls from his favorite NYPD Detective yet. He was sprawled out on a couch in his living room, his daughter threw darts at a board across the room. A low groan from Alexis let her displeasure be known.

"Same thing?" her father asked sitting up.

"Yeah." was the despondent answer. They both looked over. Every single dart that was thrown was a bull's-eye. The both frowned.

"You're a mutant!" the elder Castle cried out and immediately shrunk from the look his daughter gave him.

"Thanks, dad, that didn't cross my mind yet." The teen moaned in exasperation. Richard Castle frowned, this was weird. The whole thing stank of origin set-up and it would have been more exciting if it wasn't his daughter. He knew the price of what could come, he'd read the ending to those stories a million times. He even wrote a few.

"Alexis, listen we have to go through this rationally." Castle offered.

"Agreed." Alexis replied smartly. "This can be dangerous; no way can I just go around crushing things with my bare hands. That's more attention than I want." Her head bobbed as she spoke, visibly agreeing with herself. Castle relaxed a little hearing his daughter's logical side taking over the problem. The kid was a thinker, where she got those brains was a mystery he'd love to read.

"Right, so we can either find out your limits or just learn how to control yourself enough prevent you from crushing things." Castle brainstormed.

"What's the worse that could happen if I just learn control?" his daughter queried, her ginger eyebrows furrowed.

Castle gave that genuine thought. "You could lose it and do something you didn't expect." He spoke honestly.

"Like hurt someone."

"Maybe."

"Maybe worse?"

"Maybe." Castle nodded morosely. That was the problem with having a mind like Castle's. He could see beyond most men, see the possibilities as they spilled out like words on a page. Like the stories he wrote, a foreshadow was cast and his face darkened. A father protects his daughter no matter what. "Too many unknowns."

"Limits then, unknowns are dangerous right now." Alexis stated grimly.

"Let's see what else you can crush." her father offered.