First off, this is great! It's got solid 'chaste girl discovers sex' vibe, even if masturbation isn't new to her, and well-executed raceplay is pretty rare. I like it!
Something you can more easily do when writing from a first person point of view than from a second or third person point of view is portraying
inner conflict. She wants something, but she knows she shouldn't. Her parents would disown her, she'd be ruined, yada yada, and yet some animal need in the back of her mind tells her to give in. You could double down on this a lot more than you're already doing. She's pretty passive, especially during her first time getting groped. Here, already, you could have her more explicitly experience a swirl of emotions: fear, revulsion, curiosity, humiliation, desire, powerlessness, eagerness, fulfilledness, regret, etc.
Also, there's no dialogue at all in the first chapters. This may be a conscious choice (in which case ignore me), but here too, having her plead or struggle (possibly half-heartedly) with her assailant can drive home the conflict she's experiencing, the struggle between what her body wants and what her mind knows is proper. Unspoken thoughts would work too.
One thing that kind of bothered me was how often the story uses the word 'brown'. This is a raceplay story, so you do need to establish her ethnic and racial identity or it doesn't work at all, but it started feeling monotonous. Try using more creative/artistic terms like 'dark', 'olive', 'copper', or 'chocolate' to reinforce the raceplay aspect without having to repeating yourself. Outright slurs are also an option, if you're comfortable with that, as is the religious angle.
I kinda feel like overhauling the current chapters, adding more detail about her home life and tweaking the plot elements.
This is not necessarily a bad idea (I know, that's a ringing endorsement if ever I gave one) but I also think that keeping the story centered entirely on Yasmin can help keep the story focused. If you start introducing more characters and widening the plot, you run the risk of watering down the story a lot. That's a common problem in erotic (early access) games and (chapter-a-day/week) stories: they start off strong, but then the author piles on more and more
things, trying to keep the story (and the Patreon moneys...) going, until it's an unrecognizable mess. You could also very easily get stuck on rewriting the early chapters over and over, making sideways rather than forward progress. Proceed with caution!