You do realize that "bullies" doesn't suddenly translate to "everyday bullying", just because you 
really really like Yumi, right?
'Matador' had Nodoka getting things ready, including taking Yumi's clothes, getting Sensei involved, taking a pic of them, then attempting to blackmail her.
It is 
bullying though
, just like how it was bullying when Yumi tried to strip Futaba, way before that:
Nodoka probably was even inspired by that Event, since it made Futaba feel unsafe even while showering.
The Yumi failing at masturbating then getting cucked by Nodoka stuff, happens in 'Things That Hurt' (if it's not missed), not 'Matador'. In 'Matador' Yumi can reject being blackmailed and leave.
TLDR: You might want to pay more attention.