
spoiler:
yes, after Penny left, Yvonne thought she can finally easily put the others under her influence, during tea time, Duke would remember Penny's advice and see that she doesn't have reflection in the tea, it would remind him that demons or supernatural beings (non-humans) don't have reflection. There's also a reason why Derrick's the most influenced, aside from his guilt from losing Yvonne, he's the one that had more interactions w/ her and less with Penny, Penny instinctively counter Yvonne's power so Reynold, Duke, her maid and butler doesn't get hypnotized easily. Yvonne would have to make a conscious and strong push (like what she did to Eclis) overpower their mind.
PUHLEASEEE FOR THE LOVE OF WHOEVER READ THE NOVEL, PUHLEASE SPOIL MEE (ᗒᗩᗕ)
Does he actually do that? Like look at the cup? What happens neeext?
SPOIL MEEE. I'LL PAY YOU A DOLLLAAA