[Steve's frowning, concerned. This is a big thing, and in his opinion Frisk's mother should know about it; and he doesn't like the idea of keeping secrets from Toriel, especially secrets concerning Frisk. On the other hand he doesn't want to break Frisk's trust, and he thinks he might do just about anything at the moment to not have Frisk look so damn terrified.]

Hey, shhhhh... [He lifts a hand to smooth Frisk's hair back, not quite able to help the impulse.] I meant what I said, I'm not gonna tell anyone if you don't want me to. ...Not even your ma. OK?