@Askorti
From the sketch of chapter 7 she posted on twitter it doesn't seem she will. Senpai definitely likes molesting girls. I'm still not sure how she feels about MMC, but it seems Kanon isn't even her only target.
It's NTR in spirit if you tease a relationship with the MC and the MC has to go through heartbreak. It's about the feeling of betrayal and love being stabbed in the back if nothing else.