Dorian really likes Bryn a lot but there are a lot of uncomfortable feelings there that just sort of popped open the second Harry came into it. Like, generally speaking, he finds her enjoyable and interesting company. Also, fourway! But she loves music and music is sort of his purest love, so it makes him very fond of her in a very pure way? I mean not that he doesn't want to have sex with her, but that's a different matter. He feels connected to her on a musical level and that has always had a strong hold over him.

But because of Henry, things are a little disturbing? Sometimes she talks in ways he remembers talking and it gets under his skin. He can't speak out about it because that's how Henry has affected him, but it does unnerve him, and he wants to stop anything bad from happening but he's utterly helpless to do so. So it bothers him, and makes him want to spend more time around her to keep her away from it.