I just finished Shuu's route a day or two ago and landed the best ending.
This time around, things were a little more annoying because at first, you can only visit Shuu at the Mansion on Mon or Wed; later, he will also appear at the Bookstore on Fri and the Restaurant on Sat.
A lot of auditions take place on Mondays, I belatedly realize.
So yeah, I was off to a slower start in getting him to move on from Strangers to Acquaintances to Friends. I managed to get to the Friends stage in early Feb, and finally sailed into the Crush status at a week before May ended, then not long after I had MC/Haato confess. As always, the sexual relationship began in June.
To completely change your partner's sexual preference, you need only have sex with them eight times.
Unlike on my laptop, I had Shuu be dominant instead of submissive. You will net more CGs if he's submissive, just a mini spoiler, I'm throwing out there. I finished the game with $800, 000 still left over.
Currently, I'm working on Shiba's route.