Why is John so surprised about this? They'd discussed it last night. Certainly, he'd expected some amount of surprise at being caught unaware, but it sounds now as though John hadn't agreed to this at all. Granted, the punch could have been clarified some, because Sherlock hadn't taken it as disagreement, just a sign of frustrations running high or... something. He's not very good with understanding the reasons behind things when they have to do with emotion.
He is however very well aware that this move may well elicit interesting reactions from John, judging from what he'd experienced in the kitchen and in the alley. John's gasping about how he can't breathe at first, but then once the grip loosens, everything changes. The tension in John's body changes perceptibly and he's not quite sure what to make of it or what it had changed to, but he hears that low whine and the pieces begin to fall together. He's not fully aware of it before his own body starts reacting. He's more aware of the causal factors for John than he is for himself. Proximity to John, certainly, but did the struggle play a part in it? His position of control? The edge of danger, the rush, like was there for John - was that effecting Sherlock too?
His breath is hot on John's neck and he's fairly sure he's said again that John ought to beg mercy, but he hasn't actually uttered a word. It's all in his head, and the only sound he's made is some low guttural strangled sound as John fights him weakly and Sherlock holds on, careful not to actually choke him but tight enough to keep him close. If it all doesn't make sense immediately for John, it will when he realizes that there's a particular press against his lower back as this goes on.
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He is however very well aware that this move may well elicit interesting reactions from John, judging from what he'd experienced in the kitchen and in the alley. John's gasping about how he can't breathe at first, but then once the grip loosens, everything changes. The tension in John's body changes perceptibly and he's not quite sure what to make of it or what it had changed to, but he hears that low whine and the pieces begin to fall together. He's not fully aware of it before his own body starts reacting. He's more aware of the causal factors for John than he is for himself. Proximity to John, certainly, but did the struggle play a part in it? His position of control? The edge of danger, the rush, like was there for John - was that effecting Sherlock too?
His breath is hot on John's neck and he's fairly sure he's said again that John ought to beg mercy, but he hasn't actually uttered a word. It's all in his head, and the only sound he's made is some low guttural strangled sound as John fights him weakly and Sherlock holds on, careful not to actually choke him but tight enough to keep him close. If it all doesn't make sense immediately for John, it will when he realizes that there's a particular press against his lower back as this goes on.