Played a 3dcg that was about 2 (i believe twin) brothers and their one sister who they were now staying with. All three were blonde characters, I do remember a side character red redhead. The main girl was the sister and she had large features. Plotline allowed you to either go full corruption or go love route. Really hoping for any help or answer, might've also been on itch.io but I had no luck on there either.
