I didn't understand the joke here? why her ear was like that? and why was this the solution the author come up with to stop their withdrawal? do rabbits ears have that sort of pattern? Am i overanalyzing?
It seemed reminiscent of a Junji Ito horror and likely also Lovecraftian in nature.
My take on it is that the insides of a moon rabbit which you can peak into through the ears can not be comprehended and it leaves you paralyzed and going insane.