Well now I'm pretty sure we might know where Mr. Edburt (is that his name excuse me its like 3 am i onky got around 3 hours to sleep so im unsure about everyhing) came from. Now this woman right here might be the "mistress" Mr. Edburt was talking about pages ago (when he was about to eat that kid in school), calling her mistress meaning she is probably the "" master"" of the demon eater and this might have been the moment that Tobias 'acquired' the demon eater ( it also could be that this is the first time seeing the demon eater but the demon eater was only acqured by Tobias later when he was older and mature, which is the more likely case). As for why she would choose Tobias to carry the demon eater, it might have to do with calling him "one of the surviving sons" (something along those lines sorry i can't go back and check because mobile issues oof). We just met this woman a page ago so we don't know much about her but this page is leading us to believe that she might be the cause of Tobias' possession. This is all I have for now I might add onto this in replies when i actually see what i had written here. But yeah thats just a theory I managed to crack at 3 am hope its a good theory oop