Love the story, really like this take on an rgre.
One thing I noticed is that you seem to have issues with punctuation and capitalization, but those aren't really big problems.

I really like this story. Chap 3 was the last thing I would have ever expected, but I like where this is going.

DONT READ UNTILL YOU FINISH CHAP 3
CONTAINS SPOILERS

And here I am staring blankly ahead wondering how to phrase what I want to say. I can't use innocence, because sex and innocence don't go together in most peoples minds. even though there is nothing that says emotionally innocent people can't fuck like broncos. Although the mind and the bodies biological urges are separate and have little to do with each other, people can't mentally pair them together........Ok, so how do I put this?.....Hurmmmm..

Try not to loose what makes your story special. That nieve dependency on mares that almost no other story even hits on. As well as that fact that although he doesn't like the fact that he is dependent on them, he doesn't see it in himself. I don't mind the sex thing, because we all have facets to our personalities. Even the quietest introvert has a sexual side, and it is very, very true that its the quietest ones that are the kinkiest. I learned this first hand in high school. The quietest, most introverted loner of a girl you could possibly imagine had the most warped, kinkiest fantasies that she wanted to try out. (I, a teenaged boy full of testosterone, was ok with this. Go figure.)

It will be fun to see how you balance innocent schoolgirl in public, sexual tiger in private.

Should be an absolutely fun ride.

Im looking forward to more.

The Monk
“Heat? isn't that when... I took a whiff of air when I smelled a smelly smell that smells smelly.” -The Kitsune

Yes u updated!!!!!!!

So the guy isn't a fan of herds. Makes sense. Respectable.

When's the next chapter?

There are a lot of typos and grammatical errors in this chapter. Other than that, I like the plot.

His personality made a complete 180 here with barely any explanation. I’d like to see some progression instead of just being told it’s happened.

The backstory is a good start but could use a little more. Nobles and herds in a society that prizes colts and stallions would in a lot of trouble for the physical and emotional neglect inflicted upon MC most prominently when he’s a minor.