Can I-- [Technically speaking, Edwin knows that he shouldn't be able to blush, but his body is a reflection of his memory and his will and he remembers what embarrassment feels like enough for his cheeks to colour.]

I've never thought about it, if you must know. From a purely theoretical standpoint, then it would be possible, however ghosts don't really feel things like you do.

[To illustrate his point, he reaches out to pick up the teacup.]

I can interact with it, but it's only pressure. I cannot feel the heat, or the texture of the china. If I were to drink it, it would be like sand.

[He sets the cup down again and straightens it.]

But I could phase through the floor and leave. I doubt very much that the Cat King will have power to keep a warden in place here.