AN:

This is semi-established K/S- as in they've been dating a few months, and are on shore leave together for the first time- on Earth. They're still awkward. Reboot universe.

This was entirely innapropriate.

"Well, hello there Miss….?"

"Ayres. Lieutenant Angelica Ayres."

"Well, Lieutenant, it's lovely to meet you. I'm Captain Kirk."

"I know who you are, Captain," she giggled, eyelashes fluttering. She smoothed the hem of her far too short dress, smiling at Jim as though he was the best thing she'd seen all week as he ordered her a drink made with so much fruit it was barely alcoholic.

Spock stood behind Jim, quietly seething at being ignored once again. He had been in this odorous, crowded bar for precisely three hours and twenty-seven minutes, and he could count the number of glances Jim had even shot his way on one hand. Considering that they were on their first shore leave together, this was unacceptable.

Spock's arms were folded across his chest in an unconsciously defensive stance, his mind occupied with glaring at the offending woman. Jim, on the other hand, was sprawled across the bar, grinning lecherously at Lieutenant Ayres – who didn't seem to particularly mind. Spock debated using the Vulcan nerve pinch on either Jim or the Lieutenant, but decided it would probably result in his being arrested, or worse, starting a messy and chaotic bar brawl, and so he resisted.

Jim was speaking again, asking the Lieutenant if she came here often and how come he'd never seen her before. Spock rolled his eyes. Please. That kind of generic utterance was surely not going to work. It was in the top six percent of phrases used in human dating initiation. It was, in the human vernacular, a cheesy line; although the complexities of this metaphor were lost on Spock as he failed to grasp how a phrase used to attract a mate could bear similarities to a dairy product.

Apparently however, Lieutenant Ayres either was unaware of this fact or simply chose to ignore it, as she was leaning against Jim's arm, pressing her not inconsiderable bosom against his elbow and giggling inanely at something Kirk just said. At this point, Spock decided that it was time to take action; Jim had clearly imbibed enough alcohol as he was allowing this flirtation to continue. He reached past the well -endowed Lieutenant, grabbing Jim's arm and physically dragging him from his seat.

"Come along, Captain. I believe you have had enough."

Jim struggled ineffectually against Spock. "But it's only midnight! I was just getting to know people!"

"Indeed," Spock replied icily, pulling Kirk relentlessly to the small hotel room they were sharing on their shore leave.

Once there, Kirk pouted and pretended to ignore Spock whilst they undressed for bed. Finally he cracked, snapping, "I don't see why you had to ruin my fun, Spock. I was just being friendly."

"Yes. Friendly. Of course, how illogical of me to mistake that woman's heaving bosom on your arm for anything other than a friendly exchange." Spock refused to look at Jim, incensed. "Also I must have misinterpreted the other women you have been 'getting to know' – I apologise for my lack of expertise in the field of human interaction as I was under the impression that kissing people on the lips is not usual for a first time encounter."

"She kissed me!"

"You were not attempting to release her lips from yours."

"Yeah, well."

"I am sorry, that does not seem to be adequate as a response."

"Spock, are you jealous?"

Spock finally turned to face Jim, eyes blazing despite the calm expression on his face. "Jealousy is a highly illogical emotion."

"You are! Spock- you have no need to be worried, I'm not going to run off with Lieutenant Ar...Ayle?"

"Ayres. At least do her the courtesy of recalling her name."

"Seriously? You're worried because I flirted? Or is it because the ladies actually like me, whereas you get to stand in the corner looking like some kind of awkward, pointy-eared hat stand?"

"I do not care whether female humans have an opinion on my appearance, nor do I understand the similarities between a hat stand and my person."

"Of course not- because you don't care about anything, do you Spock? It's all the same to you, you green-blooded, high-and-fucking mighty bastard. Nothing computes, not a single fucking thing I do matters, not deep down. You're about as emotionally developed as a rock! In fact, Spock, a rock is probably easier to please than you."

"I must inform you that your attempts to rouse an emotional response are failing," Spock replied, trying to calm the furious tremor in his body. He felt like every muscle was tensed, coiled like a predator- and that scared him more than anything, knowing that he could be so close to losing control again.

"Of course I'm failing, Spock! You don't even have an emotional response to fucking rouse!" Jim was almost screaming now, his hands balled into fists at his sides, confused and frustrated with both himself and the Vulcan. "I've met corpses who were easier to get a response out of than you!"

"I assume this is your issue, Captain? You are insecure of my affections and so initiate activities which you perceive will elicit a loss of control in my emotion in order to reaffirm our relationship status?" Spock sounded much calmer than he felt, the tremor in his voice hidden carefully by the neutral, almost bored tone of his words. He folded his hands behind his back, digging his nails into the palms of his hands in an attempt to keep himself from lashing out.

Jim narrowed his eyes, stepping forward right into Spock's personal space- an action that he knew Spock particularly disliked. He pushed himself up on the balls of his feet so he could better get in Spock's face. "Affections? Do you even know what that means? You're an unemotional, bitter, ungrateful bastard who only cares about what regulation you can cite at me next- when I saved your god damned life all you could do was tell me how many rules I'd broken! You didn't give a shit that maybe I'd saved you because I actually liked having you around! Hell I bet that when I died all you were thinking about was how many Starfleet regulations I'd breached by fixing the warp core and how you would phrase them in your god damn fucking report!"

Spock's heart twisted painfully. He fought to remain silent until Jim had exhausted his current argument, his mouth dry and his pulse thudding in his temples. He tried to rationalise to himself that Jim was drunk, that he didn't know what he was saying- but it didn't stop his gut tying itself into knots or that sick feeling in the pit of his stomach. Nor did it stop the veil of white-hot rage descending onto him, adrenaline surging through his body.

"You are mistaken," he managed to reply, his voice barely more than a growl as he fought for control of his anger. "I felt your loss deeply. I would have stopped at nothing to avenge you."

"Felt? Don't lie to yourself, Spock. You feel nothing. I flirt with women; I get their attention- because I want your attention, Spock."

"I feel everything, Captain." More than you will ever know.

Jim gave a derisive snort, curling his lip contemptuously. "You felt nothing when your own mother died, how can I even compete?"

That was the final straw. With a roar, Spock pushed out with both arms, staggering Jim back, before swinging a powerful punch at his face. Kirk's nose crunched, blood spraying across Spock's knuckles, but the Vulcan barely paused before grabbing Jim by the collar and punching him again, splitting his lip. More blood coated his hand, merely enraging Spock further.

Jim finally raised his own fists, aiming a punch at Spock's face that almost missed, only catching the side of the Vulcan's jaw. Spock snarled, pulling Jim around and shoving him back against the flimsy wall of the room, which shuddered under the force of his impact. Jim groaned in pain, his breathing ragged, and Spock closed in on him, hitting him with savage force in his ribs, his stomach, his face again. "You…will not…dare to presume how I feel," Spock ground out between punches. Kirk managed to duck the last one, pushing himself to the side and striking out at the Vulcan with both fists. His left connected, Spock's ears ringing from the force of the blow, but Jim was off balance and stumbled, the Vulcan using the momentum to slam Jim into the small coffee table at the centre of their room. The human crashed into it face first, the flimsy wood collapsing under his weight, and he lay gasping for a moment. Spock threw himself at him, Jim managing to turn onto his back just in time to bring up his knees and avoid the worst of the Vulcan's weight. He punched Spock in the face, as hard as he could manage, and this time it was green blood which splattered as Spock's nose was broken. Momentarily stunned, Spock hesitated, and Kirk hit him again, shoving him backwards and straddling him. He rained blows on the Vulcan, his arms aching from the effort, until Spock managed to flip them over, pinning Jim to the floor with all of his body weight. "Does this look fucking unemotional?" Spock spat, grabbing Jim's throat and squeezing. Jim choked, gasping for air and clawing at Spock's arms, but Spock was intent, his Vulcan strength making it impossible for Kirk to move. "I feel more than you will ever, ever understand. I wept for you when you died." His voice moved to a shout as he glared down at Jim, his eyes dark. "I would have killed Khan for you! Did no one tell you that the reason I had my hands behind my back when you awoke was because I had broken every bone in them beating that bastard? Or that Uhura had to pull me off his unconscious body so that I didn't continue to hit him? Do you seriously believe that I do not feel anything for you?"

Jim couldn't answer, too busy trying to breathe, but he shook his head as much as Spock's grip would allow. Spock could feel Jim's emotions through the skin to skin contact, a chaotic tumble of words and images. What the hell was I saying he's going to kill me I'm sorry, I'm sorry I had no idea, fuck he's sexy when he's angry, his eyes are so black wonder if he can hear what I'm thinking god I'd love him to fuck me instead of trying to break my neck please don't stop need this please-

Spock loosened his grip a little as Jim inadvertently sent him a graphic image of himself being fucked by Spock, in what looked to be a painful, brutal way. Kirk took in a great gasp of air, coughing.

Spock couldn't understand how Jim could be simultaneously fearful for his life and aroused, and apparently neither did Jim, as his thoughts were coloured with confusion and doubt. But as Spock shifted, he realised with anger and bewilderment that Jim was hard. And worse, so was he.

I want to break you, Spock thought suddenly. Break you and make you beg. The thought shocked him, defying the logical, controlled part of his mind. Jim stared up at him, silent for once in his life, as Spock processed this new, strange emotion. It wasn't the same as his primal urge to destroy; it was darker somehow, more basic even than the need to break bones.