See, it's funny when swap sans walks with UT paps because papyrus takes long strides (+much faster than us pap, who walks slowly)

So blue has to almost jog to keep up with paps walking

Whenever they walk they're so far ahead in front of their bros

Blue wouldn't tell paps to slow down, paps might eventually notice if he wasn't excited to be chatting with a smol friend

Paps probably finds blue absolutely adorable cuz he's like his bro but energetic and excitable (and they have a lot in common)

AND HE'S TINY. JUST LIKE BRO.

Blue hanging out with the papses (UT/UF) and he's tiny in comparison and they both tease him about it.

Stretch joins in the teasing too and Blue is ready to break a kneecap

(maybe not that extreme, but he'd definitely hate it)

Oh the feeling when he meets swapfell sans and that dude has no chill about being teased about his height

Black would verbally payback all the teasing 10 times over

They'd both team up just because they're shorties