You knoooow, if you're a fellow tomboy enjoyer, chicks with dicks are basically tomboys, except you get to trade fap stories and share the urinals in public restrooms and they're always down for anal
...
Just something to think about..
Some people really wish she'd go back to being a Mean Girl, and some people like the added depth. But, I think she's more fun as a love interest, when she has some different levels to her personality.
I personally think you can have best of both worlds and make it work. I've known some really sweet girls that get completely vicious and mental if they feel they've been wronged or you've said an opinion they REALLY don't like lol... or sometimes, they just really don't like someone for some reason, maybe out of jealousy or something. You could maybe play around with that between Brittani and Gabbi, where maybe Gabbi has seen that side and you haven't; or maybe she doesn't get vicious, but just passive aggressive superior, if that makes sense. Can maybe play the girls against each other, take one or the other's side (i.e., helping Gabbi get revenge vs helping Brittani bully Gabbi), or get them to make up. Maybe have a pot of a few hundred bucks and pit them against each other to make you cum to win it all, hair pulling, pushing, and all... that would definitely fit findom imo.
Just some random ideas to toy with, maybe they're stupid; you gotta do what you feel is right for your story of course
Tbh, I've forgotten their exact story with each other so far anyways, so maybe none of that would work with what you've set up. Maybe some other characters can have that kind of hatred rivalry? I dunno