Encyclopedia Entry
A race of elves possessing brown skin and pointed ears. They dwell in peculiar villages that they establish in forests and Mamono Realms, etc. Long, long ago, before the current Mamono Lord's reign, they were not monsters, but upon her assumption of power, the dark elves, who were lustful and uninhibited to begin with, offered their own bodies to the Succubi and changed into monsters.
They don't detest humans as other elves do, but they love to make human men who strike their fancy submit to them using pleasure. Men they capture will receive plenty of love, as either "sex slaves" or "pets." Besides making enslaved human men prepare their meals, etc. they also reproduce using these slaves. As one can tell from that, their slaves are essentially the same as what other monsters refer to as their husbands. It's just that their way of showing love for their men is different from that of other monsters.
Dark elven children are thoroughly taught skills for pleasuring a man and the taste of pleasure using their own fathers. Eventually, when they reach adulthood, they'll go off on a journey in search of their own slave, but it is said that there are also those who will fall in love with their father through the training and will no longer desire any other man.
Father/daughter incest is taboo among humans, but they are vastly different from humans, as far as they're concerned, if a daughter wants to have sex with her father, then it's only natural to put desire first. They have no revulsion towards incest whatsoever. If a daughter desires her father, then she'll start having threesomes with her mother and father from that night on, as if it's the most natural thing.
They get along extremely poorly with the stubborn elves and supposedly they frequently fight, or so it is said, but it's mainly the elves that unilaterally despise the dark elves, they're the ones who try to wipe out the dark elves. On the other hand, a dark elf would have fun thoroughly teaching an ignorant captured elf pleasure, changing her into a lewd monster just like herself.