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Benladann had suggested I just eat at Rose's soul now that she was of no use. She seemed to not know anything more than what we already wanted to know, but she was getting a bit too extreme there. Rose had already died after all and was enslaved and charmed by both of us, it was enough to let her be at our side as a servant, and she held important information and power that could be of use.
It's not like I was charmed by her beauty or something cliché like that, but it was useful to have someone so resourceful in the area of knowledge available with us, after all, by eating souls I do not always get all the information they have, even less Benladann whose soul-eating is an even inferior version. Keeping her soul "alive" while having her enslaved and charmed is for the best.
Check "The Protagnist's Sister Is Actually the Strongest"!