Rin tries to picture how that would exactly go. He can't imagine Yukio giving him grief for laughs. Shiro sort of did, though. But more to get Rin's fires going than anything. If Sans' brother was anything like Shiro, he could definitely see him as being a really cool guy.

"How can somebody be positive all the time?" he asks with genuine curiosity. Wouldn't life get in the way one way or another? He wouldn't mind learning that secret if he could. Being able to stay happy in every situation would be great and maybe he'd be able to make friends more easily.