Bruce didn't stop kissing Clark until he was good and well done kissing him, but then he put himself back in a position that didn't make a body he'd broken and abused for decades try and exact revenge on him.

He left his hand in Clark's hair, anyway, closed his eyes and waited for a second or two for the protest to stop and to catch his breath.

And pretended to be completely diverted while he did it. In truth, he more or less was.