I mean.. she already suffer no? Humiliation, death, rape? Eaten alive and still live through it. Even removing the goddess and priestess curse what left?.
Well we do have one option left.. MC impregnate her, makes her have a male child she loves..and then blend it in front of her breaking her as form of vengeance. Or redemption and the sister returns and forgive her and in the after life she a mom with her son and im guessing husband? Idk. But redemption should be best option.
Did ever explain were the sister soul went?
Suffering from the sense of a punishment is not always so cut and dry. Speculating on what Raoul might continue to do is pointless at the current stage, and basing it on her past torture is also meaningless given that we already know that he has
only killed people who deserve death, including the Goddess of Love.
Victoria made her own choices, but with his mastery over magic and keen analytical sense, Raoul has proven that he has been aware of many people's true pasts and has the detachment to judge their lives equally--he is not some mindless sadist looking to inflict as much nonsensical pain as possible, that's not what revenge is.
Ignoring your bad grammar and spelling, I'm honestly disgusted you decided to jump straight to child-killing as a choice, even as an example. It shows you have the worst priorities, nevermind that you haven't actually been paying attention to the manga.
Raoul's sister was not in hell, otherwise he would have found her the moment he stepped into hell originally. She's likely already part of the reincarnation cycle, if not somewhere in the gods' domain. The people who can do anything in this series are the gods, or the living, and Raoul's sister has not once personally made an appearance--the torture for her ex-husband was a magic illusion set to infinitely repeat until his soul truly repented.