Yamamoto is not exactly showing it off or talking about it. Really he has said little about their future so far unless prompted. It's all a little confusing for the baseball idiot how each of them seems to be from a different place in their history, so he is letting it ride for the moment. The fact that he holds on tighter makes Yamamoto feel better, even as the baseball idiot yawns again.

It would be hilarious but he'd prefer to avoid that comedy right now himself, so he would not be offended if it might be a safer, warmer mode of transportation for his friend.

He dissolves into laughter, unfortunately, he can not completely hold still in the motion, but he does not make any big or jarring movements so Gokudera should be okay. It would be more frightening, less funny if not for the fact that was such a high-pitched giggle in his ear and it's coming from Gokudera. He sucks in a breath when he is done, continuing on his way but already thinking he wouldn't mind stopping to take a break.

"Maybe I got an outie, you'd never know!" He almost laughs again. Besides, does he even have a belly button, are they sure he's not some clone of his dad, no one has ever seen or heard a word about any kind of mother after all.