[He gladly shook the other boy's hand, nodding and giving a soft hum.]

I'm glad we had the chance before the year ended.

[Gilbert began talking soon after he said that sentence, causing the taller German to look back at him.]

Brother, please...just behave.

[He looked back and forth between the two, sighing and deciding to introduce his sibling.]

I'm not sure if you've met him yet, but this is my older brother: Gilbert. Please forgive his lack of manners, he's--ah...a bit informal.