Identify A game where someone close to you is being corrupted while you try to save them

[XPOM]

I don't remember the game very well, I remember that you play as a female character, and your sister? is held captive by someone during the game, and while you are trying to find and save her, you are sometimes shown what is happening to her and how she is being corrupted.

I would like to find this game, or similar ones.

 

[Goeffel]

in Ambrosia it is not your sister, but an Alraune girl that is living at your temple.
She is abducted by the evil guys and you have 4 days to pay some high ransom or else ...
https://f95zone.to/threads/72813/

preview pictures show only the priestess (and a goddess), not the alraune girl.

Priestess herself also can become lewd, slutty, de-virginised, ... or not.