Identify corruption game (redhead schoolgirl that helps her sister and gets blackmailed)

[aaasdasdasdsadasas]

hello all,
i'm trying to remember a game i've played some time ago, where you are a redhead schoolgirl that's very sporty but her sister gets into some trouble and then you slowly become more and more corrupted in order to "help her". i've completely forgotten the name though. anyone know what game i'm talking about?

 

[wwwdjonn]

Hi,
You're probably thinking of Casey's Fall https://f95zone.to/threads/caseys-fall-v2023-05-sakrilas-velcrofist.79580/