What's the Name of That Book??? discussion

This book would have been published pre 2015 and I got it from the library in the young adult fantasy section. It had a dragon and some blue and green mist on the cover. There was also a girl who both the boys had a crush on who had cigarette burns from a family member. I also recall her and the visible boy kinda hook up in this like snow storm in order to keep warm. They are in the snow again and the boy says no and that they’ll just hold each other close because he knows the other boy has a crush on her. I think the invisible boy was going to like talk to a dragon or something they were trying to find a way to make him visible and when they do he looks identical to the other boy. I wish I had more details but this is all I can recall about this book and it’s been driving me crazy I can’t remember the title.

Dragons of Darkness by Antonia Michaelis?

Oh my god yes! Thank you so much I have been looking for this title forever!