Here's letter U. I'm having fun with Castle and Beckett once again, they're simply great to watch and write about. Have fun reading and stop by to leave your impressions. Feedback is important, thanks.

UNDERCOVER

"I think we might need your Ferrari after all Castle" Beckett suggested raising her head from the file she had been reading for a while. That damn case was driving her crazy.

He looked at her and smiled brightening up at the idea that she was up to something fun.

"So far Castle we have nothing but a bunch of dead ends. We might just as well have a good time while we go and see what was going on in that night club the day the girl disappeared."

"And we're using my Ferrari for...?" he hinted intrigued.

"We're going undercover Castle. Cheer up, I know you love that, don't you Rick?" she teased.

And didn't he? How couldn't he? The last time she had done her best to make him loose his mind by sweeping into a room to rescue him with nothing on but a stunning red dress so terribly short he had dreamed about her perfect long legs for a whole week... and so tight that every hot curve of her body had had him scream inside for... well, he had lost count about that. But red, really? The association between his car and that dress was permanently imprinted on his head and he honestly hoped she would choose a different dress this time or he might just as well...

"Castle focus!" she shouted making him jump from his chair "and stop fantasizing" she added trying to hide the huge smile that had formed on her face noticing the effect of the word undercover on her partner.

Oh yes, she was definitely going to have a good time with her favourite ruggedly handsome writer...

He blushed thinking she'd been reading his deepest thoughts. Very well Detective Beckett - he said to himself giving her a wicked smile - aren't we going to play this dance again? I'm all in.

"Ok then, tonight. Will come and pick you up at ten. Think about something fancy to wear, we need your charming Castle at his best to perform this." and she went back to her file.

"Damn it Beckett!" - he thought - this woman was so going to kill him. "See you later."

B&C

"Richard darling, going out on a date?"

"No mother – he replied knowing she would not stop until she was fully satisfied with her share of teasing – going undercover."

"Oh I see, with your fav NYPD detective I suppose..."

"Obviously not with Esposito" he snapped as he gave himself a last look in the mirror.

"Guess he doesn't appreciate that very expensive cologne you've put on" she mocked.

But she will – he thought – knowing Beckett had told him so on a previous occasion.

"Kate you look amazing" – said Martha letting her into the apartment.

"Thank you" she replied the colour rising on her cheeks.

Castle was speechless as he approached her in the living room.

My God - he thought - this is going to be real hard. That black very short dress which clings perfectly to her body like a glove... she is smoking hot!

"I'm ready" he told her showing proudly the key of his Ferrari.

"I'm driving" she stated matter-of-fact.

"You're what?" He gasped "This is a Ferrari Beckett...this car is designed to..."

"Right Castle" she said grabbing the key "Let's go... the night is still young"

Martha gave the two a wicked smile. "Have fun and please... don't come home too early!"

Beckett nodded while Castle looked so pissed off.

Why on earth it was she driving all the time? Even his own car?

He was really trying his best but man... he couldn't think straight and as she took her place at the driver's seat she pulled her very tight dress further up to adjust to a more comfortable position. Those long edible creamy legs would hunt him forever. Swallowing hard to keep his excitement under control he turned his eyes away from her. Beckett's lips turned upwards, she was enjoying every single moment of her night out with him, undercover or not. "One... two...three...four... bingo she said to herself as his eyes were back on her thighs.

She started to sway to the music the minute they stepped into the club joining in with the lively, chatting people on the dance floor.

And now... dammit... what is she doing? She moved so dangerously close to him, brushing her incredible curves all over his body.

His only coherent reaction to her teasing was quite unexpected for Beckett. She found herself in his arms while she felt his right hand wandering on her thigh and slowly moving upwards.

"Castle!" she yelled "what the hell are you doing?" yet she relished the way he was touching her.

How could possibly such a big, strong hand be so gentle and soft? She wondered trying to picture what kind of magic his hands could perform on her skin.

"Being my usual charming self?" "What do you pretend me to do anyway?" he replied seriously, as he shifted from her to hide his arousal. Her smell lingered around him and he just stood there and watched her move in sync with the music.

"Please Castle focus " she pleaded him already mourning the loss of his warm touch.

She leaned forward and whispered in his ear "Go and get some drinks while I try and sneak over there" she told him nodding in the direction of a man sitting on a sofa, a huge bodyguard before him and a couple of girls on both sides.

"Right, drinks. Will be back in a minute."

And what did just happen now? He thought heading back to her holding two glasses in his hands.

The body guard was on his knees hands on his family jewels and she was pressing the other guy on the coffee table right in front of her. Better not to mess around with Katherine Beckett... the next thing he noticed was her badge flashing before the guy's face.

"Jesus Beckett – he let out – where were you hiding that?"

"Don't ask and pass me the handcuffs!"

"Ryan" she said holding her cell phone "you and Esposito will take care of the guy I'm sending you while I well... she lingered as the thought formed in her mind will take care of Castle.

When all was back to normal Beckett and Castle resumed their position on the dance floor. She really didn't feel like wasting such a good opportunity to have some more fun with him. So she started once again to tease him like she had before. Only this time he grabbed her hips and pulled her close to his raging arousal. "Katherine Beckett you are so going to pay for behaving so boldly" his eyes lit with desire. A moan escaped her mouth as she felt his urge. Quite impressive she thought. "Bad girls always get what they deserve?" She challenged him.

"You bet. Your place or mine?"

"Mine. No witnesses allowed to our party."

"Wow" he gulped.

Castle moaned and stirred on the bed. Where was he? And why was it still dark? Ok, Beckett's place. His head still felt slightly dizzy from the most mind blowing night of smoking sex with his favourite detective. She was everything he could think of to describe her. Sweet, tender, so damn feminine, wild and passionate and she had just matched his raging desire till they had collapsed in each other's arms. His body felt deliciously sore. A nice hot shower would just do then he'd make her a huge breakfast.

"Oh hell" he screamed as he was finally back to reality sensing the blindfold on his eyes and the cuffs on his his wrists. "Beckett?"

"morning Castle, ready for the best wake up call of your life?"

A/N: I hope you liked this. If you did please review. I might turn some of these quick shots into more elaborate stories so let me know which are the ones you'd like me to develop. Till the next one...