It's nice when kids love turtles who happen to be ninjas. Because of this whole situation of being a turtle in the first place, being surrounded doesn't happen very often for him unless he's facing enemies. And the children, being smaller versions of adults, do not fear him or Donnie. So he's feeling very supported, sniffing again to clear up his nasal passages.

"You're right, kids," Raph smiles at the two who speak up. "She's gonna do great!" Talking about the girl like she's real or something.

Another sniff, and he also turns to look at the turtlekin still tucked away in his beefy arm. "Yeah, Mr. Donnie, don't be shy an' share with the class!"