Another reason could be Kuro wanted Mochida to hear so she'll know she isn't interested in the math teacher at all and Mochida will confirm her woman loving interests and maybe that'll get all the other girls to stop bothering about their heterosexual love lives.
Right now, she's the most complicated person in the manga for me since I feel like I don't know enough about her to really determine her actions. She's drawn with the that look on her face but then she's all smiles and cuddly with Aya and the author hasn't depicted that face during those moments so I can't help but feel like maybe she isn't that bad?
That reason is definitely another valid one. I don't know though, I feel like she definitely is that bad heh. It seems to me that all her smiles and cuddly stuff are just more ways to manipulate Aya. Perhaps she's genuinely happy in some cases though like when Aya came over in the most recent chapter... or when she fucked with Haruki. I sure hope that she does legitimately fall for Aya at some point though.
I maintain that her reasoning is simple one though I failed to elaborate. Mochida probably wants to gossip about her love life and the juicy thing she learned at school. Her school seems full of stuck up girls so maybe she doesn't have that many friends there so she hasn't been able to share this interesting tidbit she's learned?
But if she's a master manipulator then the other reason could be that she's hoping Haruki will spread the gossip about Aya and Kuro and somehow reach their school. Or maybe she's fishing for information about what Haruki knows about Kuro and Aya so she can blab back to her own school that Kuro and Aya are indeed in a relationship (she only heard Kuro propositioning Aya so she doesn't know if Aya agreed or not?). In either of those scenarios, Kuro gets fired/is forced to quit so she can have math teacher all to herself. Though I doubt she's that masterful since she's having trouble getting the attention of one guy.
I'm curious how you think sharing helped her so far? Since it benefits her more if Aya and Kuro continue their relationship?
From how she’s been presented my take is just that it was typical teen goss combined with a bit of wanting to badmouth the woman her crush is crushing on to clear her nerves. I don’t really see Mochida being quite so manipulative; if she sabotages Sei it’ll likely be a decision she makes in the moment.
She really should just tell everyone about Kuro and get her fired... it seems that she's not really a bad person (or as bad as everyone else anyway), so perhaps she doesn't want to go quite that far. It seems that sharing this teen goss with Haruki hasn't really helped her yet, at least in a way that she could have predicted. I was thinking she was hoping that Haruki would support Aya and ensure that she stays in the relationship for longer, but it seems that is not the case. Mochida definitely doesn't seem manipulative based on what we've seen so far, but she's definitely been smiling evilly a lot, so I thought she was up to something.
I think it’s more or less in line with what we’ve seen of Sei up to this point. She stays seething in the closet in order to keep her livelihood intact, then engages in the most toxic sorts of relief to destress.
In this case, when Mochida tries to hold her sexuality over her head, Sei realizes that she essentially holds all of the power in that moment - they’re alone, Mochida is seen as a goof-off, and there’s a degree of sexual threat too - and decides to engage in some pretty juvenile one-upping. She’s basically flexing a “yeah, I am; who the fuck are you even going to tell?” It’s very in the vein of traditional abuser tactics, like a lot if Sei’s behavior.
So, she was just trying to fuck with Mochida, huh... that's certainly also a valid Kuro move given what she just did to Haruki. Her penchant for just fucking everyone over is so hilarious to me, honestly.
How did that rumor about Sei even start? Was she caught by one of her students on a date or did she date one of her students? Because if it's the latter, then she's probably not afraid of unemployment.
It seems like it's all just baseless rumors at this point since I recall the girls were saying in one of the earlier chapters that they thought Kuro was looking at them in a pervy way or whatever. It would be interesting if she did date someone before though I haven't really seen any indications of that yet.
On a side note, I thought that woman at the end of Chapter 5.5 was Aya until the end and I was like "Wait, since when was Aya a mangaka? And why is she named FLOWERCHILD now?" It was only at the end that I realized it was the real-life backstory for Warikitta (what shall we abbreviate this to, I wonder? WariKan? I don't quite know how these anime abbreviations work, but that seem similar to stuff like YagaKimi and whatever anyway).