It is not Yamamoto's fault at all that Gokudera is interested in butts, and especially his, but he's still going to act offended about it. Maybe if things are getting too dull, Gokudera can get on the network asking where he can get some flame retardant pants.

"I'm not asking you to set your butt on fire! I'm telling you to come over here. Look." Gokudera sets the lighter down on the sand in front of him.

"If you can't keep your hands to yourself, you deserve to walk around without pants on!" Out of context, that remark makes zero sense. These two are ridiculous.