[Those are definitely going to leave marks...oh well. He was far too interested in the sounds Spock was making in response to quit. There's a sense of smugness at getting Spock so distracted that Jim now has full use of both hands.
Jim had to mentally take a step back to realize that he had Spock unraveling in his hands (somewhat literally and figuratively); Spock who was always so closed off to almost everyone but him, allowing him to see this. Jim needs to see Spock fall apart completely by his own hand now, projecting how much he's enjoying seeing Spock like this. He's noting changes in the cord wanting to see how else it reacts to them.
And with the deftness of someone as practiced as he is, Jim undoes the button on the front of Spock's pants and lowers the zipper with one swift motion, inserting a warm hand to wrap around him.]
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Jim had to mentally take a step back to realize that he had Spock unraveling in his hands (somewhat literally and figuratively); Spock who was always so closed off to almost everyone but him, allowing him to see this. Jim needs to see Spock fall apart completely by his own hand now, projecting how much he's enjoying seeing Spock like this. He's noting changes in the cord wanting to see how else it reacts to them.
And with the deftness of someone as practiced as he is, Jim undoes the button on the front of Spock's pants and lowers the zipper with one swift motion, inserting a warm hand to wrap around him.]