Tsubasa's motives are a little unclear. I think she is trying to groom Sensei into being Touka's husband and moving Touka and Chika into the apartment building feels like a ploy for Touka to catch Chika and Sensei "in the act" and to get her to admit her feelings for Sensei. But I also think Touka doesn't have feeling for Sensei or she might be waiting to act on them considering what she said at the end of Beachmas. And Tsubasa comments on Tsukasa makes me think she knows something about Sensei and loli Maya. But i maybe be wrong. The older Tsukiokas are a little hard to read in my opinion.
tsubasa's surface level motives are clear, she wants her daughter to have her heart broken before she gets sold off to her future husband so she doesn't have the vulnerability of expecting love in a relationship like tsubasa did from her husband and she sees sensei as a callous philandering uncaring dick with no superficial material or political aspirations that can actually jeopardize their future relationships by blackmail or other means when they eventually move on.
My thoughts/analysis on this update:
I think Ami's interaction with Sensei in Noirko's final event makes me think Ami has killed before. With my best bet being Maya and maybe her mother and father with the latter being more convincing to me considering I think her attachment to Sensei began after the accident but im not entirely sure. And when we get to the darkness route I think either Ami or Noriko is going to take one or the other out. But considering death isn't allowed I maybe wrong.
yeah my main theory for a long time has been ami murdered maya in jealousy and started the timme loop where she tries over and over again to make sensei love her by altering him till she rage kills him. then ayane tells ami she is pregnant with sensei's kid and she rage kills her. this is how you get to the roof top
My thoughts/analysis on this update:
Finally with the Chika threesome I think the most probable option being Ayane considering she knows about Sensei and Chika. While Yumi, Rin and Tsubasa are more questionable since i believe Yumi will straight up deny it. Rin is with Otoha but is still horny and impulsive so she might fold(maybe). Tsubasa did watch Sensei and Chika go at and she does want to bone Sensei but I dont she will accept threesome. And if you picked Chinami and Chika say "she will find somebody" I hope that person is Uta because why not Uta is hot and basically a shorter Rin.
honestly think its going to be Niki.
how sensei convinces her using her darkest impulses:
sensei "hey want to have a threesome with one of your biggest fans who also happens to be my student"
Niki "WTF, angry cat noises"
sensei "hear me out, no one would ever fucking believe them when they post it online. 'i had sex with my hung teacher and niki' it would be hilarious"
niki "...fine"