i'll give 3.5 because although it is a good idea, the game it self is too simple and easy, as some already mentioned, it would be more interesting if you had to go through some events of sorts, or if attended t class gave something like knowledge points which will save you when there's a pop quiz or something like that, also, your suspicion is waaaaaay to easy to control at most I spent a single day getting rid of it, and there was no side effect like the teacher's lust going down or something like that.
I'd really like to see this game finished with background music anl the other stuff you add/modify later on, one final suggestion is that you play the "sexed" and "futa sexed" games that are here on NG to get some ideas, they have very similar concepts (they actually just use another character role), they are harder yet not ridiculously so, making the game more interesting.
GOOD LUCK with the game