If Sensei was easy to get there would be no manga. The point is that Eiko is actively pursuing Sensei, while Kamu is comfortable with her current position as Eiko's daughter (Some of /u/ even call her just Eiko's pet because she grows cat ears every time she's with her). There is no #KamuTeam because Kamu isn't trying to win, she's okay not winning Eiko romantically, just having her. The romantic goal for Eiko is and will always be Sensei.
And I know you're gonna hate chapter 78 when it drops, so please don't explode when it happens, neither here nor the comment section for chapters is the correct place to explain why you hate the couple. It's what the author wants and she's gonna make it work.