I think you're on the right route (either medium or good). I believe the good route is the one where sho reunites with his mother/sister AND yuu and sho get caught (can't be avoided I believe) while the medium route is basically the same without the reuniting. The bad route is where yuu chooses to talk with Saya about the college offer instead of the relationship problems, which in return causes sho to get VERY dominant with yuu during an intimate encounter so yuu kicks him out.
Btw, there is no ending, since the Shoichi route is still WIP.
