Ok, just sat down and played the entirety of the Book 3 love route that has been completed so far.
Pros:
Toph is really rather adorable in this. The date and other interaction is really sweet and it's totally believable it eventually leads to her getting sexual for the first time in her life. Huge props to whoever wrote that romance/erotica book part about the girl slowly awakening to her sexual desire and Toph mirroring it. I actually kinda want her to be the one to initiate vaginal sex when the time comes. It would leave the love route of Book 3 with a nice arc for her.
Suki is all around FAR better in the love route. I like the idea of her slowly growing more independent, running the bar, and slowly realizing that she enjoyed the whole "finding the key" thing and wants to get physical with the MC. The touching was nice and I can't wait to see what happens next as she gets more lustful. (I never liked the whole hypnosis thing with her in the slave route. Felt a little too rapey)
Cons:
Katara really just seems out of place in this book. It really feels like its trying to make up for the overall lackluster Book 1 now. I get that it's setting up a MC\Toph\Katara threesome for endgame, but it just feels really awkward to have her involved.
Jun being the mistress of the brothel kinda comes out of left field and doesn't work with her character at all. It feels like she basically is an entirely different character right now.