Obviously this is gonna start small, with one or two or more boys. She's not particularly fussed about having her boys around all the time yet, and there isn't a need to be her soul mate or anything along those lines. At the start you'll be able to pretty much come and go as you want, but obviously the longer its been since you've seen her, the more displeased she's gonna be.
I would like this is culminate eventually (not until the distant future) where she has her own territory. Either she's taken this by force with her army of stallions or she has been invited to live with one of her boys. If the latter happens, obviously the reverse harem has to come too :3
We can thread if you would like, or we don't have to, but if thats the case I'd like to flesh out the exact nature of their relationship, ie. would you like to become her right hand, is it just a casual thing etc