Ayane actually tried to convince Sensei to fuck her on Ami's bed twice (first try got interrupted by Ami), and Sensei can fuck Ayane on Sana's bed towards the end of Chapter 3, as well, which seemed to also be Ayane's idea:
The Kirin stuff is completely optional and doesn't really matter much because of it. Kirin and Ayane can even still be friends currently.
Nothing makes this look good.
Ayane refused to use Sara's name because she saw her as a threat once, but yeah she's not really threatening to jump people like Chika. Although she very clearly does not want to share or let anyone else have a chance with Sensei. Noriko actually supports others, including her sister, in trying to get with Sensei. Noriko wants to be loved, but being the only one isn't really the plan, as she seems to be perfectly fine with sharing him. Ayane also does get a little hostile when she thinks someone is trying to "steal" Sensei:
Ayane spent hours with the Shapeshifter and was talking about why the world is like this when she said it was good news for her:
Anyway, the point was she might have helped kill off Maya Prime, to steal her place, but it's not entirely clear yet. If so, she should at the least feel guilty.
Ayane acknowledging that someone, even Sana, wants Sensei, isn't anywhere close to Noriko wishing her own rivals luck, and wanting them to be happy. We also haven't seen the actual fallout of Sana admitting her feelings to Ayane (Ayane definitely acted strange). Sana actually seemed to grow closer to Noriko after it, ironically.
Overall: Until Noriko goes out of her way to fuck Sensei on Niki's or even Kirin's bed, I don't really see how they are all that comparable, beyond being outspoken about their love for Sensei. Ayane even seems far more stalkerish. Having pics of Sensei sleeping on her wall, and recently casually pulling out a copy of his phone.
Ayane's also straight, rich, and studies karate for fun. Noriko is bi, works, and delivers food to the homeless. Ayane carries guns. Noriko carries a pocket knife. Ayane will choke and slap people. Noriko hasn't even hurt a fly as far as I recall. Even when it comes to diets they are different.
If Noriko was actually like Ayane, Kirin would probably have issues with her like she does with Ayane and Karin.
Frankly, I see Kirin and Ayane as even more similar. Both get off on defiling the things of others, will betray the trust of their friends for Sensei's dick, are neglected by their parents, and gave away their virginity as soon as they could.
Edit: Ayane and Kirin also both have "loli" friends they are close with and actually tried to preserve their innocence at the start, until they became corrupted anyway. (Sana vs Miku)
