"yeah, that'd be great. gretel sounds like a nice bird." Any friend of Frisk is a friend of his.

Though Sans-Serif does find himself stopping halfway down the stairs at Frisk's next question. The skeleton stares at nothing for a moment, rocking back on his heels, before replying carefully:

"it's okay. you, um...you kinda used to." And they sometimes still do, but if he focuses, he can make the feeling go away. "but i don't think they wanted my time stuff to get along with your time stuff, anyway. so i'd wanna fight you." And he had, before. Though Sans-Serif doesn't like thinking back to how he'd felt back then. "and the other human, i guess. i don't think they really knew which one of you would come to the underground."

He starts carefully down the steps again. "i'm glad you think i'm cool, though."