This is first try at a Castle fanfic, so I'm sorry if they seem OOC. Please leave any constructive criticism you may have below.

I own nothing!


"So Alexis has a new boyfriend. That's what this is all about, Castle?" Beckett smiled as she looked at the worried father sitting in a seat next to her desk.

Kate had noticed something was off about the usually charismatic author when he had walked in this morning slowly and he was constantly starting off in space as if he was in deep thought. It turns out he was, but it was only until now, the late evening, when he decided to share what had been plaguing his mind.

Rick shook his head sighing as he leaned back in his chair. "It's not the fact that it's a boyfriend, but the fact that I don't trust this kid at all. The...the way he looks at her makes me want to borrow your gun and show him what I really think."

"I see you're real fond of the boy, Castle." Esposito sarcastically noted turning his chair to face the other two.

"You should be a detective, sir." Castle flicked the ever sarcastic Espo. The detective just laughed and shrugged his shoulders spinning around Ryan's chair when he felt it had got caught on his in their cramped space in between two of their desks.

Ryan nodded a thanks before putting his thought into the conversation. "When my sister went out with this boy back in high school, I didn't trust the sleezebag one bit." He sighed as he recalled the painful memory.

The young Kevin was sat at the stairs ever since 11; the time his sister and her new boyfriend said they would return. It was now 12:30
in the morning. His other sisters went to sleep earlier telling Kevin to head to sleep and not worry, their sister would be home soon. He disagreed, his parents weren't home this weekend, someone had to be the man of the house and make sure his sister returned safely.

He focused all his attention on the door and what seemed like hours later, but what was really only minutes, he heard the door slowly creak open only letting a sliver of light through along with the hushed whispers of his sister. "Just leave, Ron, before you wake them up." Kevin noticed her try to shut the door as Ron grabbed her arm to try stopping her. Ryan's anger flared at the thought of some boy putting a hand on his sister. Tears made her voice thick and he heard her straining not to break down, but what really pushed him over the edge that night was the bruise that covered her left cheek.

"You son of a bitch." Kevin whispered heading down the stairs and practically ripping the door off its hinges as he threw it open to get a better view of the dirtbag that hurt his sister. He grabbed Ron's shirt collar before sending a right hook into his face. "Don't come near my sister again, you asshole." Kevin warned punching his stomach between every word.

"Kevin! I can take care of myself!" She said wiping tears off her cheeks. "Stop before you hurt yourself."

Before she could pull Kevin off of Ron, her ex-friend grabbed the 14 year old boy and threw him to the wall with one hand and using the forearm of his other arm to push it against Kevin's windpipe. "Shut up, you little brat. And if you don't stay out of this I will pound your skull."

Kevin struggled to say something back, but the pressure on his throat told him otherwise as all he could do was cough with a faintly blue face. His sister screamed.

"Let him go, Ron, or I swear, I will call the police!" She gained some strength in her voice when she knew that he would be afraid of her threat and back down.

He growled, "Go to Hell." He released his arm letting a rush of much needed air into Kevin's lungs before sending a punch flying directly into his eye and he pulled his arm back again and sending a punch into his nose causing a rush of blood pouring out. He pulled back his fist again, but she grabbed his arm and repeated, "I will call the goddamned police!"

A smirk was all she saw before he dropped the trembling boy to the ground before slamming the front door behind him.

"Kevin," his sister gasped falling to get knees by his side picking his head up. Tears of both fear and relief trailed down her cheeks as she tried to speak. "Kev, you didn't-"

A dry chuckle escaped Kevin's face as he wiped the blood off his bruised face. "I'm your brother, I'll always be there for you."

"So our little squirt took on a big boy?" Javier teased his partner with a laugh and slap on the back trying to lighten the mood.

"I'll have you know I was 14 and put up a good fight until...he started fighting back." He cleared his throat and with his tie as he mumbled the last part.

Beckett smiled patting his hand, "Don't listen to him Ryan, I thought you were very brave and sweet." She added with a small smirk squeezing his fingers.

Castle rubbed his hand through his hair ignoring the other's conversation, "Was that supposed to help me?!" He looked at the youngest detective who nervously chuckled. The author scoffed and continued, "She'll be here any minute to stop by with the scumbag to head to their date. I can't just let her go!"

"You're over thinking this, Castle. Alexis is a good girl, she'll know when to get help if she needs it." His girlfriend tried to reassure him with a comforting smile.

"Yeah, but Ryan's sister was a good girl too." Espo said, but was soon followed by a harsh, threatening glare from Kate. But before they could start again, the elevator doors opened and Alexis walked out hand in hand with her new boyfriend. Her smile could light up the world it seemed, but next to her the boy did not look pleased at all to be in the police station.

"I thought you said your dad was an author." He whispered sharply as they approached the four who were sitting watching the couple with keen eyes.

Alexis laughed, "He is, James, but he helps the detectives with their cases a lot." James nodded, but this didn't seem to relieve him of any uneasiness.

Castle stood up when they arrived. "Hey Dad." She smiled leaning to give him a hug that the author gladly returned, forgetting his worries for a second. "We stopped by before, like you said."

"Yes you did." He smiled and offered his hand to James that the boy only shook when Alexis elbowed his side glaring.

"James, this is Detective Beckett," The detective smiled. "Detective Esposito," He nodded with a glare. "and Detective Ryan." He joined his partner with a glare.

"Okay..." He said turning his attention away from the duo wondering what was their problem. "You ready, babe?" He said grabbing her hip.

She giggled and nodded, but Castle interrupted, "Wait a minute, where will you be? When will you get home?" Alexis smiled and answered,

"The movies and then Remy's. Home by 11?" She asked.

It was a quarter after seven new, so Castle signed and reluctantly nodded. "Fine, but if you're even a minute late; grounded for the rest of your life. Do you understand?"

His daughter smiled happily and she placed a small kiss on his cheek. "Thank you, Daddy! I'll come home on time, I promise!"

As James began to pull her away, she turned back and whispered, "And promise you won't spy on me, Dad." She stated more than asked. "Fine, I won't spy on you, sweetheart, just be careful."

"I will." She smiled before dashing after James. "Wait up!"

Castle didn't say a thing until the elevator doors shut. "Ryan?" He said quickly turning to the detective.

"Defiantly a Ron." He breathed looking at Castle with worry filling his bright blue eyes.

"Shit." Castle stood up starting toward the elevator, but Beckett quickly stopped him. "Are you serious, Rick? You're going to stop her date because that idiot thinks he's like some boy from 20 years ago?" She didn't exactly trust this James, but she didn't want to see Alexis upset with her father because he cancelled her date before he had a real reason to. Whether she was right or wrong, Kate knew the mind of a teenage girl and if Castle interfered, it would not be an easy apology.

"I for one agree with the idiot." Espo said. "Maybe not enough to stop it now, but I think you should defiantly follow her."

Kate nodded somewhat as Castle spoke, "No, I can't. She'd see me and never forgive me, but that doesn't mean someone else can't follow them." The boys looked at each other and smirked.

"Come on, Castle. Sending them to spy on your daughter? Do you understand how weird it would feel if Espo sat behind her in the movies or Ryan fine dine in the table next to her?"

Ryan cleared his throat. "Castle, it's better safe than sorry."

Espo laughed, "Besides who are you really gonna listen to? Remember, bros before ho-" Espo stopped short noticing Beckett's glare and corrected himself. "Female detective friends."

Castle chuckled and turned to Ryan. "What do you think, Kev? Do you mind doing me a favor?"

The detective smiled, "It would be my pleasure, Castle."

Javier turned to his partner, "Sorry bro, I'd love to help, but I got a shit load of paperwork."

Ryan laughed. "This is a teenage boy, and I'm an adult; clearly capable of handling myself." He rolled his eyes putting his jacket on and grabbing his keys before heading to the elevator.

"This is crazy, Castle. What if she sees him?"

"As long as my baby is safe."