Okay so this is one of my favorite pages because of Neptune. Neptune believes in what he can see so to him, Santa isn’t real. But when he sees his brother so upset over the possibility of Santa being a myth, he throws his logic out the window and pretend he believes for Seto. He may think his brother is annoying and a weirdo but he does still care about him.
And hey…it sounds like something might be up on the rooftop!