Adam nearly facepalmed - he really should ask Anna or Adam - possibly both, actually - one of these days about if there were ways to keep out specific demons but not others. Crowley he could deal with - he was barely ‘evil’ to begin with, much less after him, but others; those he really didn’t want to have to deal with.
He glanced down at the salt line. “Yeah, I…I thought it might be a good idea. Precautions. Adam’s got one of ‘em next to his door, too.” He swept away a little bit of the salt and pulled Crowley in over the broken line, almost immediately pulling a small salt shaker out of his pocket and dumping a whole new line down. “Nothing, really. Anna’s branded my ribs with some sigils so it’s harder to find me.”
Adam wondered how Crowley found him at all, at this point - wasn’t he an angel once, too? He probably just expected Adam to be at home, which made sense -after everything that’d happened recently, he really didn’t go out much. (Though he was a particularly restless boy, and when he needed out, he needed out.)
Crowley was somewhat surprised when Adam actually brushed aside some salt and dragged him inside. The broken line did nothing to him—the demon was about to point out that this was hardly a good thing if there was ever a demon tailing him, but Adam quickly fixed the line without this prodding.
He raised an eyebrow at the action. Someone was teaching the kid useful habits. He didn’t mind, seeing as it saved him the trouble. “Anna?” Despite there being more people than ever, it felt like London was getting smaller. He examined the line of salt again.
“You could use some angel proofing. Lucifer was technically an angel.” He glanced around until he found an envelope for a bill and a pen on a table. He picked the objects up and paused for a moment to recall exactly the symbol required, scribbling it out. Crowley held it out for Adam for a fraction of a second before taking it back and drawing something else on the envelope. “And this one is for demons, in case you didn’t know.” Perks of having been both: he knew both symbols pretty well.
Adam nodded. He saw Crowley raise his eyebrow at Anna, and lifted up his t-shirt for a quick second to show Crowley his ribs - again, as if doing that would work somehow. All anyone really got from that was an eyeful of incredibly pasty teenage stomach. “See? Yeah, Anna. She’s real cool. She used t’be an angel, too. But I don’t think she’s a demon or whatever. She’s a human now. I didn’t know that could happen.”
Adam didn’t know those sigils at all - he really wasn’t familiar with any of this stuff. Anything he already knew were things Adam and Anna taught him. He cringed a little, remembering something Adam had told him, once. “Do I have to use blood for it? I don’t really like knives…” Another thing came to his mind. “Why aren’t they affectin’ you if you’re a demon?”