[ That's one of the reasons why Spock is holding back from a full mind meld; their bond has already made their link so much stronger, more sensitive. He really wasn't kidding about it overwhelming Jim if he wasn't careful so Spock has to be careful enough for them both. A thrill here, teasing there, ultimately not much, but it serves to heighten the link.
He's careful with the bond anyway; the physical side of it doesn't have to be careful at all. He takes Jim's encouragement, leaning in harder as he takes over the kiss as well, nearly bruising in its ferocity against Jim's mouth, responding to Jim's need he feels along the cord. He seeks out what else Jim likes as one hand snakes down to Jim's wrist, gripping it tightly and pressing it into the bed by Jim's head. ]
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He's careful with the bond anyway; the physical side of it doesn't have to be careful at all. He takes Jim's encouragement, leaning in harder as he takes over the kiss as well, nearly bruising in its ferocity against Jim's mouth, responding to Jim's need he feels along the cord. He seeks out what else Jim likes as one hand snakes down to Jim's wrist, gripping it tightly and pressing it into the bed by Jim's head. ]