They make fun of how small the cage is and the fact that he won't have any problem at all fitting into it.
Soon the principal is the one with his ass in the air, bent over his own desk, as the two brat inform him that they found his stash in his drawer and if he wants them to keep his secret quiet, then from now on, they will dish out the punishment around here.
These three Goddesses seem quite amused at how much this one has to learn.