Try and compromise.

You wanted to be a benevolent mistress, since you felt that these elves needed a gentle tentacle to steer them, but you couldn't let them defy you! They Mentioned some sort of Umi Nyobo, or whatever. You'd just have to fuck her into submission, then those elves wouldn't need a dryad!

"Topssssssside, Umi!" You say, making a suggestive gesture with your tentacles. "Topsssside Umi." You say again, before pointing at the Green Man. "Topssside." You said.

"You want to... Enslave the umi-nyobo? Then take the Dryad?" The Milf said, less horrorfied, but still apprehensive. You nod, smiling! You liked this milf, she was a good addition to the harem, and you were glad you took her.

The elves begin talking amongst each other. You didn't care, since you'd be making them do what you wanted anyway, but you'd let them think they had a say in the matter.