AU: Okay so this one was inspired by a request made by DarkStiletto, to do the "you smell like cherries" scene from the episode Vampire Wekend. I also added in a refrence to the coffee scene in One Man's Treasure. This one is a rated M fic, so naturalyl don't read if you don't want to.

Plz remeber to review, and send me some of your ideas! Kate Beckett sighed as she attempted to make herself comfortable in her desk chair. It had been a long day, and she felt like she was getting nowhere. Her current case, involving a boy with veneer "fangs", and a man dressed as a werewolf, was getting weirder and more unbelievable every minute, only adding to her stress. She was currently waiting to hear back from Esposito on a possible lead, but it was getting late, and she really needed to go and de-stress.

Thankfully, Esposito showed up a few minutes later to hand her the file of one Morgan Lockerby. The man had been well known in the vampire circuit, but was said to have gone crazy when he actually began believing in his practices. Happy to have finally found a possible lead, Kate breathed a sigh of relief. As she began flipping through the file Esposito turned to ask, "Where's your shadow?"

Kate didn't need ask who he meant. It was pretty clear he was referring to Castle, and his lost puppy ways. The man constantly followed her around when they were working together. Though she had been slightly annoying when they first started, she had grown used to his presence, even found it kind of comforting at times. Not bothering to glance up from the file she replied, "I don't know. Last time I saw him he was still sifting through evidence from Crow's apartment." Esposito nodded in acknowledgement, and decided to bring up his real reason for beginning this conversation.

"So you going?"

Attempting to act clueless Beckett replied, "To what?"

"To his Halloween party!" he exclaimed, clearly not impressed with his superiors attempt at ignorance. Castle had been talking about his Halloween party all week, inviting almost everyone he knew at the precinct. He'd been on Beckett's case about getting a costume all week, and it drove him absolutely nuts not knowing whether she was even going to come. Unfortunately for Rick, Beckett loved Castle best when she had him wrapped around her little finger.

"I don't know; throws a lot of parties… you?"

Esposito staggered at the though of how much fun he was going to have at Castle's party. "Oh I'm all over that". Kate smirked at her colleague. Playing along she asked him what he was planning to wear. "Oh you want know? You gotta show. See what I got going on" he replied, using his hands for emphasis. Kate grinned, slightly shaking her head. The men at NYPD could be so much like teenage boys sometimes, she couldn't help but laugh. After all, it did help lighten the mood once and awhile.

Esposito retreated to his desk where he threw his coat on and picked up his things. "Anyway, I'm headed out for the night; gotta put the finishing touches on my costume before the party Saturday. I'll see you tomorrow"

Kate lifted a hand in good-bye. "Have a good one" she called as he left the office. Placing the file on her desk she looked around to find the office completely empty. She noticed some of the overnight cop's office lights on, on the other side of the precinct, but other than that, most had left for the night. Having not heard Castle leave, she walked down the hall peering into the rooms as she walked past, finally finding him in one of the small evidence rooms at the end of the hall. His suit jacket was draped on the back of his chair, and his feet placed up on the desk in attempts to get comfortable. His hair was slightly mussed and his face was drawn in concentration as he appeared to be pouring over a large book. Kate couldn't help but think how adorable Castle looked when he was reading. He was eagerly flipping to the next page as she approached him. Kate jumped up onto the desk knocking his feet off playfully with her bum. "Hard on the case Castle?" she asked.

"On the case of a good read. It's actually not that bad"

Beckett held up Lockerby's file. "Esposito found Morgan Lockerby" Castle's face lit up with recognition. He quickly flipped through the comic book, until finding the desired page.

"You mean Morlock" he replied, showing Beckett Crow's comic version of Lockerby.

Kate leaned in to get a better look at the picture in Castle's hand. Her hair fell from her shoulder, sending wafts of her perfume towards Rick's nose. He quietly inhaled the scent, delighting in its familiarity. "You smell like cherries" he breathed, attempting to take more of her in.

Kate turned her head to face Rick, their lips only inches apart. "Do you like the smell of cherries Castle?" she asked, training her seductive gaze upon him. She could feel the sparks flying between them, as her heart began to race with their closeness.

"I like the taste of them better" he replied before he enveloped her in his kiss. Kate's hand grabbed Rick's cheek, as she accepted his kiss and leaned in closer. She could feel his tongue probing at her mouth, and she hurriedly decided to grant him access. The couple continued to kiss, their tongues dancing, their bodies slowly wrapping each other in their warm embrace.

Castle finally broke the kiss to look down at what little space was between them. Somehow during their kiss, Kate had left his side and was now straddling his lap. He could feel his erection beginning to rise, and didn't want Kate to be so close if she didn't want to go that far. He was worried that if she ground into him too much he wouldn't allow her to leave. Their relationship was too delicate, and too important to ruin it for one night of hot office sex. Really hot, naughty, office sex. Castle groaned inwardly at the thought, as he began to become even harder.

Beckett giggled as she felt Rick's need begin pressing into her butt. "Having a little problem there Rick?" she asked playfully. Castle blushed slightly, moving her slightly away from him. Kate kissed him again, this time much harder, as she moved forward to ground into him.

Castle let out a low groan. "God Kate, don't do that." he hissed through his teeth.

Beckett immediately stopped in confusion. "Don't you want me?" she said, her voice holding a slight tinge of sadness.

Sensing her worries, Rick quickly placed a peck on her lips. "It's not that, believe me" he said. "It's just that, if we keep going, I don't think I can stop."

Kate shimmed up close, placing her chest against his, her lips just brushing him. "What makes you think I want to stop Castle?" She ran her hands down his chest, as he shivered in response. Castle grabbed her ass, as she unbuttoned his shirt and pulled it off of him. As she flipped open his belt buckle, he reached for her shirt, bringing it up to her neck. She took the initiative to completely remove her shirt while he made quick work of her bra.

Bra gone, Castle's lips attached themselves to the small pink bud on her right breast. Beckett moaned in delight as he nibbled, teasing her other breast in his palm. He moved his head up to suckle her collarbone as Kate finished her work on his pants. They stood briefly to rid themselves of any remaining clothing, before colliding back together in a fiery embrace.

Rick placed Kate up on the desk in front of him and began kissing her belly button, slowly teasing her as he traveled lower. He hovered for several minutes, kissing and nibbling her tummy and inner thighs, each time narrowly missing where she wanted him most. "Castle!" Kate cried in frustration.

"Yes?" he replied, with a mischievous grin on his face.

"Stop teasing! I need you in me now!" she cried, grabbing his face for a fierce kiss. She released him only to bite his lip and dig her nails into his shoulders, causing him to groan and the mix of pain and pleasure.

After a moment Beckett heard the words she'd been waiting to here, "As you wish detective" With Castle's help she hoped off the desk into his lap, slowing sinking down over him. They hissed at the feeling, his thick shaft stretching her tight canal. They began with a slow pace, preferring to learn each other's likes and dislikes. Rick continued to pump slowly in and out of Kate, until she began to wiggle signalling for more. Their pace steadily increased, until Kate was bouncing atop of Rick as he thrusted up into her with all his force. Within minutes they were both brought to a screaming climax, crying out each other's names in delight.

Kate sighed, her glistening body coming to rest against Rick in the chair. She laid her head upon his shoulder, as he stroked her hair contentedly. "That was…" she began, not sure how to describe what had just happened.

Castle offered some adjectives. "Amazing? Hot? Simply incredible?" Kate laughed.

"Any of those will do" she replied with a smile. Glancing at the clock on the wall she realized just how late it was. She gave Castle a quick peak before dismounting him. She began redressing herself as she threw Castle's clothes to him. "It's getting pretty late Castle, Alexis and Martha will worry."

Now it was Castle's turn to look at the clock. "Oh, yah I better go, but shouldn't we discuss this?" Kate finished fully redressing herself before replying.

"We can discuss it tomorrow Castle, there's no rush. I'll see you in the morning okay?" Castle nodded and followed the detective towards the door. With a parting kiss the two went their separate ways.

The early morning sun was shining through the precinct windows into the coffee room where Castle was doing his best to prepare lattes. Beckett had met him there this morning to discuss their current "situation". After much talk it was decided that they would try out a relationship, but to keep it under wraps while at work. Castle was now in the works of trying to impress Kate with his latte making skills.

Kate watched in anticipation as Rick poured the coffee and reached for the milk. As the machine turned the milk into a frothy mixture the bubbles popped, splashing hot milk on Rick's hand. Kate couldn't help but laugh, as she watched him blow on his injured hand.

"Come here and let Katie make it all better" she said holding her hand out, beckoning for him. Placing his hand in hers he blew gently on it before placing a feather light kiss upon it.

"Not bad Beckett. Care to play doctor?" asked Castle with a cheeky grin on his face. Kate stood up to his level as she rolled her eyes. "Maybe another time Castle" she said, leaning in for a quick kiss.

As they pulled apart, Ryan and Esposito walked into the break room, taking in their close quarters. "Did we interrupt something?"

Beckett and Castle glanced at each other, "Crap"