This is my first Castle fan fic. I don't own any part of Castle.

A take on the Halloween Episode of Castle. I've switched up some parts, like Rick's costume. Instead of Poe, he'll be in the Space Cowboy outfit from the beginning of the show. This is Castle's PoV.

The Halloween party was in full swing. Castle found Lanie, dressed to kill in a leather catwoman costume, holding a bright red, fizzing drink. "Careful, that is a potion of my own concoction. Drink it and who knows who or what you might become." He warned in a low voice. "Also, you might wonder what happened to your pants."

"Oooo, sounds like my kinda party." She replied dreamily and they both shared a good chuckle. He kissed the back of her hand and wondered how Lanie and Beckett had become friends. Lanie was outgoing and wasn't afraid to speak her emotions, unlike Beckett. Glancing about the room revealed that Beckett was still nowhere to be found. He spotted Esposito decked out in full military gear and Ryan in a bloodied lab coat.

"Hey Castle, you lookin for Beckett?" Esposito hollered over the blaring music.

He tried his best to look like he didn't care whether she showed up or not. "No…" he paused only a moment, curiosity getting the better of him, "why?"

"She said she wasn't sure she'd make it." Ryan said with a mouthful of food. "She had some paperwork to finish up. Ehh, it's still early." He shrugged, as if to say 'you never know'. Castle did his best to mask the disappointment that she may not actually show up. He was about to go find Alexis when he heard the sultry voice of his muse behind him.

"Hey Castle, looking for me?" Castle turned slowly and somehow managed to contain the surging excitement at seeing Detective Kate Beckett before him.

"You're you." He frowned, scoffing.

"You sound so disappointed Castle." She was fighting a smirk, but it went unbeknownst to him.

Beckett watched him, amused. "I said costumes mandatory. I mean dress up, ya know. Be…ya know a little scary."

"Yea, well I was going for sexy." She grinned, biting her lip softly. She emphasized her point by putting her hand on the belt that tied her black trench coat closed. She could see the wheels turning in his head. Castle finally looked at Kate's costume. Black trench coat that came to her knees and a black belt holding it closed. Her bare legs, toned and slightly tanned, went all the way to the floor, ending in sexy black heels. Castle gulped, his eyes following her hand to the belt. NO WAY! She wouldn't! He could feel Lanie, Esposito and Ryan behind him, but he couldn't take his eyes off Beckett's hand as she slowly began to tug on the belt. Castle's hands began to sweat, clenching and unclenching in nervousness. His eyes momentarily darted up to hers, her expression teasing, before going back to her belt. He felt his mouth go dry, his eyes widening. Oh dear god, she's serious. She gave one final tug of the belt and out jumped some sort of snake, frog thing, attached to a black shirt and shorts. Castle screamed and Kate smiled. "Now we're even."

Castle eyed the weird thing in front of him and then gave her a blank look. Lanie's laugh broke the tension and Esposito and Ryan joined in. Castle chuckled and shook his head. "I'll admit, I didn't think you were capable of such cruel humor."

Beckett raised a brow, but Castle could see the gleam in her eyes. "I don't believe I know what you mean."

"Don't play coy with me detective." Castle grinned that sexy grin of his and Beckett felt her power falter for only a moment.

"Careful Castle." Lanie warned from a few feet away.

Beckett brought a finger to Castle's jacket and ran it down the lapel. "Nice jacket." She smirked and began to walk around him. As much as she had enjoyed scaring Castle, she wanted to get this thing off of her. She felt his strong hand grab her arm, pulling her close to his side.

" I like yours better." He whispered into her ear. She was thankful that the long sleeves of her coat hid the goose bumps that instantly appeared on her flesh. "Especially if there hadn't been anything under it."

Kate steeled a glance. They were inches apart, his hot breath caressing her face. She smiled. "It might be hard for you to believe Castle, but I do have a gun under this get-up." She was having a hard time maintaining her composure when he was this close. She could smell his cologne, mixed with the scent that only belonged to Castle.

Without missing a beat, Castle replied. "Show me yours," he purred moving his lips closer, but not enough to touch hers, "and I'll show you mine." The feeling that hit Beckett's core, made her knees weak. She hoped her face didn't show how off guard he had taken her.

"Thanks for the invite Castle. The party was fun, but I must be going." Beckett said in internal blessing for Lanie's interruption. Castle let go of her arm and turned to the departing guest.

"Do you need me to get you a cab home?" Castle offered in the most sincerest tone.

Lanie smiled and shook her head, her curls bouncing wildly. "Thank you, but no, I'm good." Beckett caught some underlying meaning to her best friend's words and looked at her curiously. Lanie just smiled at her friend's interrogating glare and looked to the door. Castle and Beckkett's eyes both followed her gaze, seeing Esposito leaning against the door jam, his eyes on Lanie. Beckett chuckled and gave her friend a hug.

She whispered quietly. "If he sets one toe out of line, I'll kill him."

"And I'll bury the body." Castle chimed in, apparently having overheard. Lanie laughed and nodded, saying goodbye and disappearing out the door with Esposito.

Castle watched as guests finally began to file out the door, thanking him for throwing such a great party. He was starting to worry. After Beckett had disappeared into the bathroom, he hadn't seen her since. He was hoping she hadn't tried to sneak out with a group of people. Alexis appeared at the bottom of the steps, looking a little better than she had a couple hours before. "Look at this mess." She sighed.

"You gonna help me clean?"

"Far from it Dad. Your party, your mess. " She chastised. "Plus, I've got school in the morning. I just came down to get some water."

"Alright sweetie, sleep tight." He kissed her forehead and turned to face a nearly empty house. Martha was beginning to tidy up the kitchen, while a few other guests were getting their coats and heading out the door. Castle was beginning to think that Beckett had indeed snuck out on him. He huffed and slid his brown long coat off his shoulders and rested it on a nearby chair.

"That's a big gun there Castle." Came the sexy voice of Detective Beckett. He spun to face her, a glass in each hand. She had caught him completely off guard and completely un-armed. She was playing her part of the game well. She wore the same outfit, long black trench coat, and a black shirt and shorts beneath, except that the silly green thing was gone. She sauntered toward him, her eyes locked on his. Oh, what is she doing? Please lord, tell me this is real and not a dream! Castle looked around the room and realized that even his mother had disappeared. He swallowed hard and Beckett's sexy grin widened. She motioned to his full hands. "Problems?"

He cleared his throat and tried to give her a nonchalant shrug. "Nope." She was now close enough to him that he could feel her skin just barely touching his. He watched as she put her hand on his chest, than began to move it to his side. His breathing was coming in slow deep intervals. His knuckles were turning white around the glasses in his hands. She hooked her fingers into the toy gun at his hip, looking up to see that his eyes were closed and his nostrils flared. She chuckled lowly and his eyes popped open. The fire in them halted her, unable for her to look away. He lowered his face to hers, his lips brushing softly against hers.

"Detective Beckett, you're playing a dangerous game." He growled and ran his tongue along her bottom lip. Beckett thought she might lose her control right then and there, but somehow managed to keep her cool. She took a step back, pulling the toy gun out of its holster. She held it up and examined it slowly.

"Oh darn, it's fake." She pouted and Castle felt his control slipping. He was seconds from dropping the glasses in his hand and jumping her. She made him want to do things he'd never done before.

"You saw mine Detective," Castle grinned, waggling his eyebrows, "now show me yours." Beckett raised a brow and smirked, letting the toy gun slip from her fingers and clatter to the floor. She turned her back to him, and shimmied out of her shorts. Castle watched in surprise as the black shorts slid down her knees. "Beckett." He whispered and she threw him a glance over her shoulder. She started to stroll away, unaware of the sound of the empty cups hitting the floor. She tried to contain a shriek of surprise as Castle grabbed her shoulder and spun her to face him. It took her a moment to regain her composure. She stepped forward and pulled his shirt tail out of his pants and let her fingers play with his tight stomach. The responding hiss told her that she had total control over him. She caught sight of her destination and pushed him back until he was sitting in a chair. He looked a little surprised that he was now sitting instead of standing, but didn't protest. Beckett removed her hands from his shirt, much to his dismay, but moved them to his face. She ran her fingers over his lips, her eyes never leaving his. His hands suddenly shot to her face, pulling her to him, his mouth devouring hers.

"Castle." She whispered into his mouth, putting her hands on top of his and guiding them down to his sides. Her mouth never left his, nibbling on his bottom lip, eliciting a moan from deep in his throat. She had him distracted enough that he didn't hear the tinkling of metal as she handcuffed his hands behind the chair. It wasn't until she had pulled back from the kiss, gasping for air, that he realized that his hands were stuck. She kissed his nose and stood up.

Castle struggled, but realized he wasn't going anywhere. When she stood up, he feared she was going to leave him there. "Beckett?" He questioned. She didn't say anything, she simply slid the trench coat off her shoulders, letting it slide to the floor. Castle immediately began to pay attention to the scene before him. She stood before him in a black shirt and bright pink underwear. His breathing hitched when she began to pull her shirt over her head. She wore a matching bright pink bra underneath. She moved closer to him again, this time to straddle his lap. She took a fistful of Rick's shirt in each hand and yanked. Buttons popped and skittered across the wood floor. Her hands went immediately to his muscled chest, letting her nails graze over his nipples. "Dear god." She heard him whisper, his eyes now closed. Her hands moved to his belt and removed it swiftly. She slowly slid off his lap and down between his legs. She looked up to him, but his eyes were still closed.

"Castle." She purred, but his eyes remained closed. "Rick." She called a little louder, pressing her hand to his massive erection and rubbing slowly. His eyes shot open and stared down at her. The passion and hunger in his eyes blazed. She knew that once she let him loose that she would become his prey. "Watch me." She commanded in a velvety voice that sent shivers down his spine. She unzipped his pants, after deftly unclipping the suspenders. He lifted his hips ever so slightly and she slid his pants down his legs. His breath was ragged and she hadn't even touched him yet. He sat in a pair of simple black boxers, his cock straining against the confines. She grabbed the hem of the boxers and shimmied them down his legs. His cock stood proudly before her, begging to be touched. She ran a lone finger down his length, a guttural moan floating down to her ears. Pre-cum leaked continuously from the head. She rubbed her thumb over the top, spreading it around and then bringing it to her lips and tasting it. "Mmmmmmm." A thin sheen of sweat covered Castle's skin as he watched her, never taking his eyes off her every move. She flicked her tongue out and licked the head lightly.

"Please." Came his hoarse plea. She quickly put him out of his misery and enveloped him with her mouth, swirling her tongue gently around it. "Oh god! Kate!" He cried out at this new sensation. Hearing him cry her name like that made her panties completely soaked. She used her hand and her mouth, enticing moans and plenty of begging from him. "Kate," he begged, "I can't last much longer. I need you." She looked him dead in the eyes and smiled, letting him slide from her mouth. She stood and shucked her bra and underwear. She moved forward and straddled his legs once more, moving so she was positioned right above him. He tried desperately to buck his hips up into her, but she would just move away every time he did. He finally relented and stopped moving. She grabbed him firmly and positioned him at her entrance. She let the tip slide in, before she sank down quickly, enveloping him to the hilt. She couldn't repress the cry of pleasure that escaped her lips. He felt so good, having this power over him made her body tingle with pleasure. She moved at a torturous pace, riding him slowly.

Castle thought he was gonna lose his mind. He wasn't sure how he'd lasted this long, but he had. He watched as Kate began to bounce more feverishly on his lap. He took this opportunity to begin thrusting his hips up to meet her downward plunge. This caused him to hit a sweet spot inside her and she moaned loudly. She braced her hands on his shoulders, her mouth slamming into his passionately. She broke free, gasping for air; her body feeling like it would internally combust at any moment. Her head fell back, her mouth hanging open. Castle was on the verge and he knew she was too. "Look at me Kate." He ordered her and as their eyes locked, she felt her body slip over into the wonderful abyss that was her orgasm. She fell forward, her body shuddering as she bit into the soft flesh of his shoulder. He cried out in pleasure and pain as his own orgasm ripped through his body. "Kate!" He moaned as his body came down from his wonderful high. She had managed to calm her breathing and sat up, looking into his dark eyes. Despite having just had sex, his eyes were still burning with the passion and hunger.

"You're mine now Kate." He stated, his voice telling her everything that he was going to do to her.

T.B.C.