You know that unconscious part of your mind where most of your darker thoughts linger...well since she sealed her third eye shut and can read the unconscious parts of people's minds this was the only inevitable outcome.
It's like brain surgery; what comes out of people's mouth is bad enough therefore you wouldn't want to get any closer to the source.
Might as well stop putting those Koishi pics into "Unexpectedly Evil", after Heart-Throbbing Adventure I don't think it's particularly unexpected anymore =D