Hard to say. There's a bit here that might be a backwards Z.

[He runs a soapy finger over the letter, then scrubs at it more firmly, watching with interest as the soap suds turn pale blue.]

A few random lines and arcs...this bit actually says "hedgehog" in ancient Oggham, but that's probably coincidence.

[He rubs at all the marks, which fortunately come off easily, then leans forward again so he can reach the ones on Aziraphale's chest and eventually legs, kissing the demon's neck again in passing.]

The one on your thigh there looks like a bit like a rabbit.