This one is cute, in an appropriately creepy sort of way. That wanker with the bell eyes would have gone full on warpath for just buying his lost shit secondhand.
My best guess is that the first time it was Nodoka who did the inviting, and despite agreeing, her mindset was clearly on "I don't want Yorumun to leave", so the summoned spirit acted defensively for her sake.
The second time, it was the actual Mikamo who summoned her, and the spirit acted more...