Suppose 'cause it's a bit extreme. Not much can hurt me, can it? But you could.

[So... the demonic equivalent of intense BDSM, even if they're not actually doing anything dangerous, just being vulnerable around Aziraphale is a risk.]

That's her, yeah. Angels hunt witches, where she's from, she's had a run in or two. I told her you'd not hurt her, but...

[He shrugs. Sometimes that isn't enough.]