Characters like this exist only for the pledges, and it's the community fault. How many, "no sex ? Well, I don't care of this game, I'll try in few months". So creators add a sex addict, to provide the adult content, time for the story to grow at its own pace. Elena isn't the worse, she play a real role in the story, but she could have done it without being a total slut. Except that if she wasn't a total slut, how many people would have supported DmD at its early stage ? Probably not so much.
For me they aren't even innocent things. They look more like the woman next door who pass half of her time on her knees... but at the church. Like you said, the only thing you can achieve with them in real life is mostly to rape them.
In real life you can find women who are like this because they repress their sexual urges. But they don't speak and act like they do in games. You don't slowly corrupt them, you search for their trigger, and when you finally find it, you turn them into sex addict in almost no time. It they don't already have it deep inside their mind, no need to corrupt them, you'll mostly not achieve it in real life.
For me, the mom in BB is at another level. She like sex as much as any other woman, and she's an ice queen only in regard of her children. She's a strict mother, and still a normal woman, which make sense... Or at least it make sense until the moment she start to be corrupted by her son.
It's not uncommon regarding alone mothers, but there's a strong boundary in their mind. They are a woman only outside of their house, but at home they are a mother and just a mother. So, they can be a real slut outside of their house, but will never ever have sex at their own home, and even more never ever do it with their own child.
The mothers who can, possibly, be corrupted by their own child aren't this strict at home. Either they openly show their affection, or repress their sexual needs and act with some distance, but still are fully open-minded ; they need to repress themselves, so they also want their children to fully enjoy their life.
One thing which isn't well rendered is the mother sacrifice. I found it only in
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, when the mother, who already failed on the corruption's side, acted ready to accept everything and act like her son's personal whore, if it can help him and in the same time protect his sisters.
For me, the default in nowadays corruption game is their definition of corruption. They are more on the side of coercion, mixed with mind breaking and brainwashing. Corruption is more a release than a forced act.
Deep inside them, it's what the targets want, the player just remove the taboo/moral obstacles who prevent them to act as they desire. Then the player can go further, slowly pushing the limits. But, by example, a character who isn't, secretly or not, already submissive can't be corrupted to submission ; you can force it, but it's not corruption anymore, it's rape, and she'll never really like it.
And it's were most of the games failed. We should see the already present submission in the behavior of the character. A (secretly or not) submissive mother inadvertently groped by her son react with a faked anger, not with a real one. She don't want it, she don't like it, but she also haven't the personality to oppose to it, while in the same time she try to impose her authority as mother.
In a way, the said older sisters is partly what I talked about above. For some reason (probably her parents divorce, after all she's the oldest, the one who've understood it the most) she repressed her sexuality and act as a prude girl. But if you find the right trigger, you can make her stop this repression and act more freely.
The problem isn't that she's blackmailed, but more the second spoiler.
This game is a good example. The dialog writing isn't exceptional, but each character have it's own personality which is correctly depicted, both in what they say and how they act. Even the two, "please support my game", characters have their own personalities. They are free whores, but not the same kind of whore and despite their assertive personalities, they stay credible.
