Hmm interesting, can be fun to see where this is going.
Can be fun to play the stallion also, trying to breed with mares
Hmm will see if it will have some form of transformation options.
you can use flowers and different flora to do so.
Or human adding some mix when it is feeding time.
Can see with the further use of the milk you can collect.
So you can change for example the size and shape of the genetalia and body parts.
make the stallion genetalia get bigger and thicker to pleace a mare, making him a stud
So different upgrades you can get with collecting surtain items.
eating a certain amount of flora gives point you can use.
Different flora in different locations
the more rare ones sometimes they are guarded by creatures
Up to you how to get them, by persuation, dominion/submission, cunning, fighting
Can have more different dangers like human theives trying to capture one and use you.
Wolves, bears and such. No dying, just defeat and then sex use or just faint and afterwards restart back at the stable.
Random if the creature will use mouth, ass or pussy.
Impregnation chance for such an act
Breeding , impregnation, pregnacy and birth
Hmm one of the upgrade can be that the mare or stallion can impregnate different species than their own.
can result in Hybrids you can play with.
(wishful thinking, but you can just add different coats or small changes to the horse)
Statistics on that also, titles like "breeding sow" after 30 births or so.
The main goal can be to find the one, the special stallion/mare and start a family
But many stallions just want to breed and put a foal in you
Small dangers like bees, eagles, badges, foxes, vulture than can do little damage or just anoy.
Well anyway will check this out and see how it goes.
You have my vote anyway
SMareSaga