Judging by this first chapter I expect this series twist to be all the girls shes biting just always had a crush on her and their just pretending to be mindslaves to get closer to her because vampire mind control isnt real
Honestly it seemed like that was the subtext of the original series, though Yura's motivation might be more like "ok fine, if I want to get with Wakana I guess I have to deal with this abject weirdo she spends all her time around"
If I was a betting woman I would not bet on an "all the dubiously consensual stuff was actually 100% consensual the whole time" reveal in something written by Mikami Teren. Even calling it a twist would be generous, given that any sort of mind manipulation is exceedingly rare in yuri manga, even including the vampire stuff.
Not that the narrative relies all that much on the mind control to provide tension anyway. "It's hot, don't worry about it" is the motto, even more so than with Mikami Teren's other works.