Responses
It doesn't feel like they are siblings. I could be wrong though.
a lot of hinting from the other characters that he doesnt feel human, hes literally too strong, might be some otherworldly being manifested as lucianas brother
If they end up together, I hope you are correct
but it is pretty obv that its not, since we already have an ml yk QND THERE IS NO WAY HE IS OR WILL EVER BE ROMANTICALLY INLOVE WITH HIS SISTER though their interactions are way too .... welp they've never crossed a line, and let's hope it remains that way