I've been saying for a long time that even though you're "playing" her brother, Haley's the actual MC of this game. Which makes sense, since it's right there in the title and everything.
I understand the various reasons why the devs didn't do it that way, but to be honest I'd kinda like to see that game. One wouldn't even have to change all that much. She could keep him all to herself or push him (and later perhaps herself) into whatever other relationships she finds interesting/amusing/potentially helpful. She could choose just how much D/s play they engage in. She could choose to be kind or cruel to her ostensible boyfriend, breaking it off early or stringing him along indefinitely (with the potential consequences that might ensue). And, to be honest, it would be a lot more interesting if she got to choose whether to keep bottling up the Klaus experience, attempt healing strictly via therapy, or call in the sharp knives. Haley making the latter choice is both more consequential and more emotionally resonant than her brother doing it; from him it's still intervening in a way she's not yet ready to accept, much less approve.
The one real advantage to making her brother the MC (other than the fact that there are people who won't play female protagonist games...which makes me sad, but oh well) is that she gets to be more of a cipher and reveal information and feelings on a schedule out of her brother's control. It makes her a more intriguing and beguiling character.