Spock is only too happy to indulge. He bends his head and kisses Jim's inner thigh before giving it a hard bite. Hard enough that it will leave a mark but not nearly hard enough to break the skin. Not yet, anyways. Spock's other hand reaches up, adjusting the rope so that it bites into Jim's skin a little more. Even without motion it should offer a good chaffing, now.

Spock trails his fingertips around Jim's throat, teasing him with the promise of more. "You remind me of the day, on the bridge. You have the same look in your eyes now as you did then. Dazed," he clarifies, stroking Jim's cock once from root to tip and then back down once more. Gripping it tight after that to let Jim feel the pulse of blood. His other hand grips his throat once more, just tight enough for his inhales to go shallow, and then releases it with soft caresses once more.

"If you desire more, you will request it properly, Jim."