Ano Oni Kyoushi ga Boku no Ane ni Naru n desu ka?

I must say that I have mixed feelings. The first time I read this was two years ago, and at the time I would have given it an 8. I liked the story, although it was also very fast-paced, but now I feel like I have to give it a 6. I don't know exactly why, maybe it's because of the sensei's inconsistency. There are many occasions where the girl gets naked and acts as if nothing is happening, and other times where she blushes at a simple compliment. I know that's what a character like the sensei does since she doesn't have much interactionwith men, but I still noticed it too much. I really liked the art, and the protagonist is also quite good. The sensei hiding her expressions is quite adorable. Is it worth reading? I think so.