Oh for sure Maya and Sensei's relationship back then was definitely sexually illicit, no doubt in fact. There is even a screen of black screen white text about Sensei saying yes to a confession made from someone with green scarf, and proceeding to finger her. There is essentially NO WAY that Sensei didn't fuck little Maya back then (this sentence sounds so
wrong though...)
And like you said it can be explained as Noriko unintentionally "spilling beans" or did something and, as a result, ultimately being considered by Maya as an act of sabotage. Or, this could just all be a misunderstanding from Maya's part, where she wrongfully concluded that any
counteract had to come from someone who knew things. I guess for now I'm admittedly biased on Maya's hate toward Noriko relating to supernatural causes, or something much spicier. I found myself reluctant to accept such anime tropey things as the bottom of everything (not saying any of these is impossible though!)
Would you mind pointing out which event is it? I vaguely remembered Maya said something about keeping Noriko away, but didn't remember if "Noriko breaking Sensei iterations" is clearly stated. For sure her hate for Noriko as of now sure is about how she could've or
had carelessly broken Sensei in the past (which is a very valid reason to have an outburst when Noriko showed up in class).
My follow up question, however, is did it really happen? Noriko's school never sank in the past, and the past Sensei iterations never made it far, so there was little to no chance for Noriko to successfully locate Sensei. Whatever Maya is worrying is something she projects her situations onto Noriko, and not because what Noriko really did in the past cycles (this can be easily proven incorrect if I later find an event where Maya clearly stated what happened before though
)