*killua glimpses the stunted movement of kalluto's hands toward his chest before he retreats and his heart slams against his ribs, surely audible to kalluto's keen ears by now. how can he possibly be so flustered when he doesn't even have the organs to arouse? his brother is getting under his skin in a way that's deeper than just sexual, burrowing into his brain and blood as members of their family are wont to do.*

...and what would that be?

*he'd better not say a boat.*