My first theory is that bidos sister k!lled her self because she realized the professor was never gonna be with her or love her like she loved him because he still has hope that his sick wife will wake up one day and theyll be together again?
(i dont know if this was shown or proven bur this is just what i think! )
I also think bidos just curious on ehat was so great about the professor that it caused her sister to k!ll herself or it might just be attachment from not having anyone but the professor since the professor inserted him self into bidos life
I think the professor will also somewhat attach himself to bido because of his loneliness snd probably sleep with her like he did with bidos sister ( if i remember correctly him and the sister slept together?) but he will eventually try to reject her when things get to personal and leaver her cause of his morals and his wife anf that would obviously made bido very furious?
ohhh interesting okay. you have kind of the take that he professor is innocent in this? i personally dont trust him i think he's definitely quietly manipulating. but its just a hunch cuz i guess technically he hasnt done anything bad and we dont know what hes thinking getting mixed up with the sisters in the first place. idk i have an unsettling feeling about him. also rlly cant say what about him made bido and her sister kinda lose sense for him.

i kinda want to hear what your guy's theories are about the story so far. maybe about bido's psychology or the professors? i know we arent super far but im kind of curious to see what people cook up