Teddy's bashful smile turned a bit impish. He did tease Billy. Especially when he was starting into one of his crabby, reclusive moods. And they had plenty of awkward miscommunications. Even worse, things that had blown up later when there had been on communication at all.
At the mock-glare he just smirked and muttered, "Teeth."
He looked at Bart with more genuine concern, though. "And are you sure she's really mad at you? Or is she maybe feeling just awkward, too?"