Jim's eyes roll back in their sockets, a shiver making his whole body shudder beneath Spock's. His hips shift in an attempt to meet Spock's strokes, arms tense as he tugs at the ropes hard, knowing full well he won't undo them or yank himself free. Just as he likes it.

Spock's words only fuel his arousal, and the only reason he doesn't moan in mindless pleasure is because the tight hand around his neck prevents him from doing just that. He licks at his lips and tries to swallow dryly, Adam's apple shifting with incredible difficulty against Spock's palm. Seconds pass and he feels his head lighter still, and his heart beats fast only out of exhilaration, not fear or worry. He trusts Spock completely, after all, and knows he'll stop long before any of this actually becomes dangerous for him.

When that hand pulls away so suddenly, Jim gasps for air, the single sharp inhale making his head spin and his vision turn white for a moment. His eyes focus on Spock again soon after, pupils blown wide as he watches him move down and quickly take his cock into his mouth in a single suck that doesn't offer nearly as much relief as it does immense frustration.

"Hot... it's so hot," he pants breathlessly, chest heaving a little. "My heart's racing, I can't— can't think straight. Fuck, I'm so... dizzy. Need more, Spock. More pleasure, more... more pain. I want... want you."