"You're the one who hurt me" Excuse me what ? You were sober enough at the start to stop it so there is playing the non consent card here. And hurt what ? Unless she was the one who cheat with your BF, i don't really understand what she hurt. Also i can't take very seriously when she is constantly biting her thumb.
I mean, Nazomi was LITERALLY blackout drunk. Even if we pretend that Nozami being blackout drunk and Shion being sober in no way invalidates her consent, it's far more than that.
Nozomi had just had her heart broken and was INCREDIBLY emotionally vulnerable. Shion absolutely took advantage of that. In the exact same way so many men have before.
Nozomi is right to feel betrayed, and yeah, she was assaulted.
Also, it's kind of refreshing to see a Yuri manga dealing with these themes.