Congrats to those, uh, two girlies for getting their sideship going! I'll need to give this manga a reread when it is over, maybe then I'll know who they are and what is their relevance to the story
She did get coerced and actually went through with it, last we saw of her was her stumbling out of public toilets in a cum-stained skirt, being seen by and lying to Yukishiro that it's just her new boyfriend being too horny.
Then the manga decided that there are more important things to tell us