I remember someone telling me about a book but I can't remember who it was to ask them the name, so I'm hoping someone could identify it.
It's a relatively recent book, since they bought it last month from the "bestseller" section in a mainstream bookshop. I'm pretty sure it takes place in our times (i.e. not medieval fantasy) and there's a disease (already established in the society) that turns people into sort of half-dragons - they grow some scales and can produce fire from their mouths, and I'm pretty sure that it's a dangerous disease because if they can't control it they explode or burst into flame or something. The half-dragons are accepted in society but also shunned because I think the disease can transfer by touch?
The main character is some lady who gets enamored with a guy who has this disease, and I think she contracts it too and runs away with him?