Drew may be a victim of Hunter's bullshit. But that doesn't have to mean, she is a "good guy" or just a "victim of the circumstanses." I like that she is an enemy at least in this game.
She can help take down Hunter at the end, i can see it happening. After that she can leave the MC and his girls alone. But it's just means she go back to her business and get other girls.
Now that i said it, it could be a good sequel to this game. (Or just a shorter side story.) Where Drew can be the protagonist and we see what she is doing. Maybe find true love? (Ok, I am getting side-tracked.)
That's the thing tho, at least regarding what we've seen till today, I don't even think she's that malicious either.
Like, in chapter 10 she does mostly 4 things, first is help the family with chores, second is the Tiff Peyton thing, third is comment on the MC stealing her panties, and fourth is the final reveal about David.
As the MC notices himself, there is nothing overtly sexual in her helping the family, she might just be actually trying to reconnect with her sister and by extension her children, much like the MC was in chapter 1.
The Tiff thing is also ultimately non malicious. Like, she is legitimately trying to have Tiff mend bridges with her best friend, while also being an impartial voice, the only reason why it all goes tits up was due to the air conditioning, something which she might even be unaware about given how shocked she looks while Tiff fucks the MC at first.
You could argue her fucking Tiff in the bad ending shows how it was all a ploy to get her alone and vulnerable, but at the same time you could argue she's doing everything to cheer her up after putting her in such a difficult position to begin with, and given her upbringing she associates orgasms with feeling better, especially after getting oogled by Tiff to begin with (especially if Drew is, again, unaware of the sex air conditioning) and even her comments about "stealing" her from the MC are mostly afterthought, and you could argue are warranted due to the MC Transphobic jokes leading to the bad ending.
The panty thing? She herself mentions how that's something she also used to do. Think about it, here we have a third generation Dio del Sesso, living in the same house as her homophobic father, who was clearly put through male growth hormones and shit, being on edge while around her while also sporting a shirt with hearts on it.
She probably thought he was also a trans woman trapped in the same cycle of abuse as she was, hence her proposing to help him shop for clothes, hence her "joking" about it just like he does, she's seeing herself in him, and she's probably also seeing his father in him.
Which leads to the 4th thing. We know next to nothing about David and Drew's relationship. My best guess? David, an extremely stressed out, neurotic man who can't sexually satisfy his domineering wife, and who is being an abusive piece of shit to his only son, breaks down after meeting with Drew during a business trip, the woman who fucked both his mother and sister, who, as a trained psychologist as well as someone who was conditioned, again, to equate sex with good feelings, simply returns the favour to him.
Remember, David might have threatened Drew as a teen, but what he did? Probably gave her the means to distance herself from her father and become her own woman. If David doesn't threaten them, Hunter doesn't do his eat pray love shit, which allows Drew to meet lots of new people and culture outside of her father's toxic mentality, allowing her to transition.
(Which also explains why Hunter isn't around while Drew is here. Dude is trying not to say a slur worse than he's an actor on the CW).
(In fact, that might be what's Gona get Hunter in the end. Drew rebels, Hunter snaps and says something extremely fucked up in the earshot of the MC and some other member of the family, the MC comes to Drew's defense because he realizes she's as much of a victim as he or the others is, and while Hunter gloats about how he doesn't care what he thinks or what Drew thinks, they're both but pawns in his sick games, we have Catherine breaking the limits of her current Sayan stage due to someone being an asshole to her aunt (call back to when she got angry at Mallory being an asshole to Aliza) and One Punch Woman Hunter in cold fury).