Yeaah I was thinking the first verse and the chorus seemed very very Michael
and the second and part of the third verse was Evan, while living with William and then, after moving with mike
This second verse, I see it like Evan slowly realizing as he grows older and away from William after the confrontation noticing Michael was also impacted by William and also had a shitty life, and that leads him to the 'you burn like me' part.
There's little of me left that could care about dousing the wildfire could be taken as Evan talking about he is not faced by violence anymore, at first, or it could be talking about Evan feeling bad because of his lovelessness, given his therapist and probably other people see that as very unnatural (which, it's not, and Evan ends up learning that it's okay!!, But the verse could be aknowledging any insecurities other people might make Evan feel about it)
I think the third verse can be seen as Michael or Evan, because on one hand, it can be Evan while he decides not to attack Michael, and the first few months of living with Michael, the person who hurt him so much and then continued to do so by leaving him alone.
It can also be on Michael's perspective, talking about William, talking about how they can just forget about him. And talking about how he is now back with Evan, back to confront his past, and he knows he is doing stuff that hurts Evan, because Evan doesn't want to be near him, at first, and that's valid, but he can't just leave him alone once more. 'oh brother, I'm home in the fires of our youth' I'm back, and I won't go away, I'll take care of you.
(I don't really know if that's the case in this au, but I have interpreted Michael going away in part as a way to cope with Williams abuse and also probably because of the guilt about what he did to Evan. Michael probably thought that Evan was safe and that he was the one hurting him by staying home with him. So running away not only because of the abuse but also because of his own guilt, and ultimately hurting Evan more, is probably something he loathes to think about)(you can give me your thoughts in this regard, it's your au after all)