[ Worse, better, all subjective. He's definitely at the edge of something, but he's surprised that he's managed to hold off as long as he has. But as much as he wants to let Finn take him over the edge, he wants them to go together, to reach that peak of pleasure in unison.
So it's with that goal in mind that he holds back, and equally for that same reason that he picks up pace to match Finn's. He's moving faster, more purposefully now, that can only mean he's getting closer too— and Jim's hips roll up in sharper, harder thrusts that push him deeper into Finn, his hand on Finn's cock matching the pace of their bodies coming together, coupled with the sounds he lets out, loud or quiet, but all breathless, all heated and driven by pleasure. ]
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So it's with that goal in mind that he holds back, and equally for that same reason that he picks up pace to match Finn's. He's moving faster, more purposefully now, that can only mean he's getting closer too— and Jim's hips roll up in sharper, harder thrusts that push him deeper into Finn, his hand on Finn's cock matching the pace of their bodies coming together, coupled with the sounds he lets out, loud or quiet, but all breathless, all heated and driven by pleasure. ]