You showed Barnaby how to use Snapchat, and afterwards he's now your friend.
You get a notification:

"Big B" added to their story

You open Barnaby and started laughing so hard that your face cheeks hurt.

Wally overhears you laughing in the other room.
"Howdy Neighbor! What's cookin'?-" Wally's pupils got bigger and his face went dark.
"He's lucky that I like him..." He said to himself.