As for your question... usually it's natural. This time not so much, but I wouldn't exactly consider it a dastardly villainous thing...? If you don't mind spoilers, the Demon would have found a vessel to incarnate in eventually. Ryner was born with the potential to become that vessel but not that vessel specifically. This had the side effect of making it extremely likely that he would go insane, kill everything around him, and die before he reached adulthood, so his genius mage father went mad and kind of broke the world in order to implant half the Demon in him in order to change that destiny and give him a chance to live. Currently, the Demon and Ryner the Human are technically two separate souls, though the Demon is slowly being assimilated into Ryner and has been for some time. (...and there's also two other beings in his head but neither of them is technically dead so...) Like I said, it's kind of a mess. ^^;
So yes forced (though it would have happened to someone anyway and he had that potential to be that someone from the start), but not villainous or anything.
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As for your question... usually it's natural. This time not so much, but I wouldn't exactly consider it a dastardly villainous thing...? If you don't mind spoilers, the Demon would have found a vessel to incarnate in eventually. Ryner was born with the potential to become that vessel but not that vessel specifically. This had the side effect of making it extremely likely that he would go insane, kill everything around him, and die before he reached adulthood, so his genius mage father went mad and kind of broke the world in order to implant half the Demon in him in order to change that destiny and give him a chance to live. Currently, the Demon and Ryner the Human are technically two separate souls, though the Demon is slowly being assimilated into Ryner and has been for some time. (...and there's also two other beings in his head but neither of them is technically dead so...) Like I said, it's kind of a mess. ^^;
So yes forced (though it would have happened to someone anyway and he had that potential to be that someone from the start), but not villainous or anything.