Thanks, I glad you enjoyed it!
The facial expressions - I've had a few people complain about them, and a few people say they really like them. Personally I like them, I much prefer the more subtle style than some of the really over the top stuff you see in some games. So that's probably going to stay the way it is I'm afraid.
As for the teacher, she isn't going to find out that it's the MC for a while, but she is going to become attached to the MC specifically as the unknown guy that gropes her, if that makes sense. So it won't be as if the MC is just a random guy to her the whole time.