Well... my first advice would be to abandon this thinking because mystical powers that just drastically change the individual, and instantaneous changes are exactly the things that make me close the game and write a scathing review.
If you are just using the idea that the best way to get advice on internet is not to ask an open question, but to lead with an intentionally wrong statement, then congrats, it was smart.
While I could expand the list of games I'd recommend (Going Deeper, Claire's Quest, Noxian Nights, Third Crisis), the game I'm gonna use as the main example was already listed by our resident Goblin and that is Witch Trainer
(with or without silver mod, it's not a fundamental difference for this discussion)
Corruption is about slow, gradual changes. It's fundamentally about a
journey from purity to sluttiness and/or submission. Now, as mentioned, you can make a story where you just indoctrinate the corruptee with sweet talk only. But realistically that would be so fucking slow that every reader would abandon the story less than a quarter way in. Hence, corruption stories take a shortcut:
they find a vulnerability in the target and exploit it to speed up the process.
There are different types of vulnerabilities, some better than other, but most of them do vest the corruptor with some degree of authority. Which is generally okay, it's a power balance that corruption fans either actively enjoy or don't mind. But the key word there is "some". The better types of vulnerabilities don't skew the power balance too much because that just makes it dull. So, corruption through outright rape or hard mind control: bad, boring, not believable, or even repulsive to some. Blackmail too, although there are some asterisks.
The good kind of corruption basically bribes the girl. Which brings us to Witch Trainer and what made it so good and popular. (Well, the art quality should not be discounted, and there were some demographic factors which made a HP parody extra popular at the time, but still). The key factor was that Hermione willingly threw away her purity,
for nothing. Those stupid house points don't really matter, in the source material the House of Protagonist always wins, exactly because it was House of Protagonist. And even if not, who the fuck cares anyway about something that superficial. But the
smart girl Hermione isn't actually smart to realize that. And so she willingly exchanges her the totality of her dignity for... what essentially is a virtual currency. The equivalent of whoring herself out for video game lootboxes. And she came to love it. Aaaaaaah, that's degenerate.
*Chef's kiss*
Now, blackmail and coercion. These things work
well enough when the stimulus is fairly weak
. Do the thing or I will do
mild reputational damage. Make a transgression small enough that obedience can be attributed to
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alone. That kind of method works for decent stories. What doesn't work is "Suck my dick or I will kill your brother", don't do that. It's just rape with extra dialogue (and yes, there is a game that does exactly that).
Hope that helps a little.