So, you have a sneaking suspicion that the person who invented the character "Natalya" and provided a whole sidequest dedicated to servicing Centaur horse-cock might just possibly have a thing for the gee-gees?
Honestly, I think that whole "romance" quest it's a Patreon sort-of-comission.
It doesn't fits Inno's usual content (more "common" content), and the way the text is written, it feels like it's specifically for someone with that very specific fetish.*
Aside of text/dialogue, the content is quite limited, actually: a couple scenes (which are relatively generic -in the sense that they just use the basic sex system-), then just grind and that's it.
Sort of of "here, done, carry over".
*something I hate about manga, is the overabundance of redundance.
X character is grabbing his cock, and Y character is face down, butt in the air.
As if situation isn't obvious itself (and what's going to follow), X character thinks "I'm going to stick my cock on Y's ass, finally! My cock on Y's ass!", and Y character thinks "oh my god, Xs is going to stick his cock on my ass! His cock in my ass!!"... so X sticks cock in Y's, and both not only repeat almost the same dialogue, but they also describe what we're already seeing, and we knew it would happen.
Example:
Filly, you're going to love horse ass. You're going to be trained to love horse ass. You like horse-ass filly? Say you love horse ass because you're a filly that love horse ass, your horse-ass loving filly!
It just feels like cheap, bad manga (or horse ass?).