Fire's different. It's--it's a thing you can control.

[Well. That made Crowley backpedal a bit. He could almost hear Aziraphale's nattering voice telling him not to tell this young girl that her sister was bad.]

Right. Okay. So, maybe not all demons are bad. But that only applies to your sister. The rest of 'em--You don't have any other demonic family members, do you?