@Miriable
Obviously she wants Gojou-kun to "plug in" the tail for her.
She isn't done changing, still needs to put on the horns and eveything, but burst out of the room as soon as she was decent (for lack of a better term considering the outfit) to exclaim how cute she finds the design.
Just as soon as the adrenaline rush of cosplay passion winds down, Kitagawa's self-awareness is going to kick in and the tables will be turned on her fufufu