Some of Butler's posts and comments said, "I'm working on summoning a devil's army and I don't care if they and I both go down in the same boat," and "I'm about to make them pay." In later ...

As long as the other person consents, Yoshida can use that body part to summon a significant portion of the Octopus Devil. Yoshida effectively utilizes the Octopus Devil's abilities in diverse ways.