But that would just make her not sexy in the end, right? After all she would just hate Harry and be...well, exactly what Laura is.
Honestly I wonder how Harry would change with that heartbreak. Would be fun if he just became uncaring.
Hate can be fun, but there is something amazing on just not caring at all.
To get addicted to Luca's cock she doesn't need to hate Harry.
She can even fall for both of them at the same time - just for different reasons.
Just like you can fall in love with two different girls.
Hate in porn games could be fun if it leads to hate-fuck. Again - because of the contrast. Both Laura and Aya hated Luca's guts and their sex scenes was hotter because of it.
"I hate him BUT I cant stop cumming on his cock." is just hotter then plain "I can't stop cumming on his cock."
It shows heir emotions more (like suicide for Romeo and Juliette makes their love more tangible).
But simple:
"I hate him SO I'll go to another man." is not a contrast. And it sups any jealousy for the girl on top of it.
Because contrast for Jealousy is Love.
Again:
"I love him more then my life BUT I can't stop cumming while cheating." is hotter then plain "I can't stop cumming while cheating."
By the end of Laura's route she throws away BOTH: hate for Luca and love for Harry.
There's no contrast left.
So she gets less sexy the more you play.
Now she's just a woman with the shitty thoughts doing shitty things.
That does NOT have to be the case (with her or Aya).
For example:
She could become more addicted to Luca, feel more reverence towards his vile strength while being mentally destroyed by him AND BECAUSE OF IT getting more appreciation for Harry's kindness and genuine love, his care.
That way BOTH contrasts will grow the more you play.
And, hence - she would become SEXIER the more you play.
Which should be the case.
Your plot needs to snowball, not kneecap itself.