Honestly, the thing with the male teacher prevents this series from going onto my favourites, and overall not much depth has been established for the characters yet so the only yuri component thus far is pretty much sexual ("I got turned on by my little sister", lol). Still, though, the art for this series is good and I think we can have reasonable confidence in a happy conclusion, so even if the plot-twists are a little cliche I don't think there's anything wrong with people having a lot of fun with it.
I'll confess that "Notes from the Garden of Lilies" is still by far a better series as far as I'm concerned, but that isn't really a reason to pile this series with criticism. It's still decent yuri in the end. I think we can all agree that the teacher/'love triangle' sucks but that doesn't that this series won't overall still manage to be enjoyable.