It's ridiculous, the sharp urge to drag Ronan back to him that flares up in response to even that small and entirely necessary separation— and Kylo just about succeeds in keeping it to himself. Ronan might have felt some kind of resistance for a moment there. Possibly.

"Slut," Kylo agrees, trying the word out. It's not one he's used before.

And, because he's feeling uncommonly generous:

"But it is true. He's not showing off his abs or anything else for me. Are you, Ronan. No. He's inviting outside attention. Because he likes it, and because he wanted to see if I would be jealous... or intrigued."