You're right, it's annoying.
I'll set up something for the next release.
For now, there are actually three paths for the sister and two for the friend.
Love, Submission and Asshole path for the sister, Love and Submission for the friend.
You gain points according to your choices :
Being nice usually gives you affection points, being dominant gives you submission points, being an asshole ... gives you nothing and it's a path on its own.
There are key choices that will give you more points and are defining the path you are on. Like when Jack hug his sister in her bedroom. It's the start of the love path, it will give you more affection points and obviously if you are interested in the love path, you shouldn't miss it.
I'll write a walkthrough for the next version.
Gina Valentina ? Or Joan Fontaine ?