Despite the critic of this route I must say I like where it is headed
Relationship like Haruki's and Yuuichi's are not uncommon and as someone who experienced this type of stuff I must say you have done a great job of potraying it. After reading your patreon's feedback message I trust you will continue with Haruki's route as you intended to.
I think a lot of visual novels these days are all very similar and a relationship like this is something that should be more explored. It reminds me a lot of Burrows by Nikko, taboo's like these should be explored more and talked about rather than every relationship to be the same with minor differing problems.
Good job Haruki is still my fav character from Tennis Ace :3.