With the assurance that Awesome and Ellie weren't watching the show from the window there was no pressure to force a kiss, Chuck kept his goodbyes curt and professional with Sarah as they separated for the night after another case. He waited with his hand on his doorknob as she turned the corner before abandoning his home and running to his neighbour's. Casey had already retreated home, setting up his evening surveillance and winced when he heard Chuck banging at his door.

"What is it Bartowski?"

"Tango."

Casey sneered still amused by the easy ploy. "Well you used it didn't you? So, you're welcome." Casey slammed the door; Chuck's foot interrupted it.

"Ahhh…" Chuck choked back a whimper. "Why would you do that?!"

Something about seeing that face in pain warmed Casey. "For the same reason I'm about to do it again." He widened the door to give it more momentum on the swing.

"No! No, no wait!" Chuck forced himself through the gap, stumbling them both into the threshold.

Casey growled pushing the long limbs off him. "What is it you want, nerd."

"You have to teach me how to tango."

"I don't have to do anythi-"

"Uh-uh-uh, stop growling. It was your fault this even came up in the first place. And when I tried to learn it Captain Awesome taught me the woman's part! It could have completely ruined the mission."

"It did."

"Exactly, soooo, teach me." Chuck grinned up at the stone-faced man.

Casey's eyes flicked up and down the length of Chuck before begrudgingly agreeing with his stupid point. "Fine. But so help me Bartowski, I will break a finger each time you step on my feet."

Chuck shrugged "Fine by me big man."

Casey walked off returning with an IPod and flicked through it before plugging it into a speaker.

"Casey, you have an IPod?"

"Yeah. So?"

"I dunno, it just seems weird." He pushed past Casey to inspect the IPod desperate to know what secret tastes it held, he could learn so much! "Don't you need emotions to enjoy music?"

Casey grabbed the prying hand and spun him round forcing Chuck's palm onto his shoulder. Chuck's eyes were big and cautious at the sudden forcefulness. Casey's other hand, the one that wasn't secured onto Chuck's hips was held mid-air expectant. Chuck started at it still slightly dumbfounded. Casey rolled his eyes at the useless immobility and grabbed the other holding it up as the strings trickled into the start of the song. The Santa Maria.

Casey's eyes locked with his and he took his first step forward. Chuck stepped back. "Tangos are the drama in a relationship." Another harsh step, Chuck swallowed but was keeping up, even under Casey's interrogation gaze. "They're the danger." He suddenly arched Chuck, swinging him round. Chuck held on tighter, eyes growing increasingly wider. "But they're also the passion." He pulled Chuck up slowly up against his chest. Before spinning him out. "You need control." Chuck stood in the centre of the room arms tight by his side as he watched Casey circle him shark like. Before stopping behind him and sliding down his body. Chuck's fingers splayed, as he remained frozen. Casey skirted back up and twisted him back round to face him. He felt the hand on his waist slide up the sensitive planes of his back. Chuck wasn't ready for this and his mind still focused on the hand was unaware of a sudden dip. His reactions kicked in and he desperately clung on to the man holding him up.

Casey sighed and shook him off letting him collapse to the floor. "Why are you panicking Bartowski?"

"Uhh, what? Oh, nothing. I'm not, nope, I'm fine sorry."

He jumped back into position as Casey sneered before increasing the speed and the aggression.

Chuck was concentrating now, beginning to follow the flow. Casey mused at how decent of a dancer he was despite his lankiness. He responded to Casey's body language and sudden changes. Though the whole time he was staring down at their feet.

It wasn't until Chuck was positioned in another dip that he had a realisation.

"Wait…" Chuck paused and looked at their joined hands. "Wait. This is the lady part again!"

"Yup."

"Casey!"

Casey smirked and left the kid on the dance floor to get himself a drink but felt the glare burning into his back.

"Took you long enough, got caught up in it did ya?"

Chuck narrowed his eyes. "Noo." He spluttered. "I just, I specifically asked you to teach me to lead."

"You're not the type."

"Damn it Casey."

"Listen, you've got the lady part down, and let's be honest that's where your strong suit is."

"As blindingly obvious as it is, I'll remind you I'm very much still a man."

Casey pointed at his hair, "You sure about that?"

Chuck slapped his hand away.

"And you do talk about your feelings a lot."

"Casey!"

"Look kid, as an 'agent' you need to be ready for any cover. You need to be fluent in both parts."

Chuck looked thoughtful, reflecting on that possibility before accepting it. "Right well good, that makes sense. But you need to teach me to lead now."

Casey sighed and straightened from leaning on the sofa. "Ok. Let's get this disaster over with so I can go to bed."

Chuck flashed him a grimacing smile. He put his hand on Casey's solid waist; it was so perfectly crafted he could feel his thumb slipping into the well-cut v of his abdomen. He raised his hand higher to stop that distraction.

Casey forced down a smile but couldn't control a cocked eyebrow. "The problem you're gonna have is you have to be dominant."

"Pffft oh please. Agent Carmichael is 100 percent oozing dominance."

"Don't say oozing again."

"Yup. I heard it."

"So your partner has to know you're in undisputedly in control. Not just from your movements, but from your eye contact."

Chuck's gaze tore from the other's waist and locked with the agent's.

"No, see you look like a frightened deer."

Chuck scrunched his eyebrows mocking hurt.

"The whole doe-eyed, cute and sensitive nerd isn't going to get a girl hot. Carmichael needs to be power, strength."

He gave a lopsided grin. "You think I'm cute." He wiggled his eyebrows teasing.

Casey growled trying his hardest to not slap his own forehead though preferably he'd rather bash some sense into the kid.

The music started up again. Chuck thought it wouldn't be dissimilar to trying to shift a fridge. Then an image of the NSA agent in a red Spanish dress distracted him. Chuck flushed and shook the image out of his head and tried to make his first step. Casey wouldn't budge.

Chuck looked up at him confused but Casey just shrugged disinterested. "Sell it to me."

Chuck narrowed his eyes at his partner and at the challenge and stalked round his prey in timing with the music.

Casey remained put as the man walked round behind him. "A tango shouldn't be set steps. You need to find your technique, find your aggression in the music and use it to disable your partner."

Chuck stood behind him, his hands made contact with the snap of the song, working down the back of Casey and stopping just before the curve of the arse before sneaking round the front and back up his chest. Casey watched with intrigue the slender hands skirting their way up.

"It's all about the confidence." Chuck was silently drinking in the advice as well as the physique in front of him. He forced Casey to outstretch his arms, his palms traced along them firmly before sharply bending one back in a police lock, fingers knotting together as their other arms remained outstretched pressed together, Chuck forced him to take strong steps backwards.

"Not bad Bartowski."

"I'm just getting started."

Casey rolled his eyes at the cocky nonsense when he felt his leg slip. Chuck had swept it and using Casey's off balance momentum to spin him around and catch him in a dip.

Chuck raised an eyebrow daringly, and Casey looked up at him with an amused and impressed smirk.