It's good to see Sarah's getting some love,
Warscared would be pleased.
Initially I liked Sarah, then it started to piss me off that she was always asking for money for sex (of course it's part of her role in Quinn's restaurant, but even so...).
But her exchange at the dorm party, if you tell Quinn you'd like to fuck Sarah and you also chose hers as the best ass, was interesting:
Sarah: "By the way, what did you tell Quinn about me?"
mc: "Hm... Refresh my memory."
Sarah: "She told me not to charge you the next time. If you catch my drift..."
mc: "Oh. Well, she asked me which one of you I liked the most and, naturally, it is you."
Sarah: "It's not the first time you've told girls you like me."
Sarah: "Dammit, Fuckface. You shouldn't... I'm not the kind of girl to be serious with a dude."
mc: "Never say never. I like you."
Sarah: "Are you not ashamed to admit that?"
mc: "Why would I be? You're super-hot, Sarah."
I kinda get the impression that's the game telling you there will never be anything between the mc and Sarah. She enjoys his big dick, but she has no feelings for him.
I always preferred Melanie over Sarah's though. I like how the two of them are a duo, but they do have different personalities. Quinn's likes them both (hence why she brings them over to watch Maya grind the mc before she tasers him), but Melanie's personality seems a little softer.
But I feel, other than being a meaningless side fuck from time-to-time, and Melanie being part of the Chad/Troy drama, I don't think much will come of these two.