A game about a single father of 2 girls, mother died or ran off years ago. He is close with his daughters, open and honest with each other, and generally relies on them for emotional support. He makes a deal with a loan shark so that he won't lose the house and gets wrapped up in a secret crime syndicate to pay it back. His daughters get kidnapped by the seedy organization.
He has to figure out where they are by text message images with hints about where to go next. Sometimes suggestive images are received, and he doesn't know what is happening to his daughters while he is forced to play their sick game. When he finds them, they haven't been harmed or violated, just made to pose in suggestive photos to drive their father nuts. Which will make him start to see them a little differently too.
The organization's actual goal was to give him only one way out of their situation. He must star in a professionally directed underground porno with his daughters.
They are given 2 weeks to get comfortable with each other, given sexual tasks to complete and send evidence of their progress. The heat continues to build until the day of the big shoot.
They will get closer in a happy & free way (light path), or be scared & worried (dark path). The light path will have the daughters get more intimate with their father, become more open minded and sexually adventurous. With limited coercion from the organization.
The dark path will have them just slowly get used to the idea, but the organization is still pushing them to go further and further. Even involving some "muscle" to get the ball rolling (not NTR, just in-person supervision or performing acts in front of crowds).