Before setting up the barter article, Hoshino Aqua asked Ruby "Do you want to save her even if it means pain?" without telling her any specific methods, and got her approval (). It's so sweet and mean, and I like it.
She knows that if she said anything specific, she'd definitely be opposed, so she gets a commitment like that, and it's so cute how difficult it is for her to do this.
She got a commitment in a way that was almost like a sneak attack, so I think it's only natural that she'd get a commitment later on. Good luck!!

My favorite before the barter | TELTEL's post