Anyway, the sluggish looking woman is a sazae-oni, a type of creatures that belongs in the same category as the kitsune because they're animals that turn into demons when they reach a certain age. In this case it's a sea snail that has turned 30 years old. They disguise themselves as beautiful women who will sleep with any man who wants her, but then cuts off his testicles and turn them into pearls. The men can only get them back if they give her gold.
One can only assume the testicles can somehow be put back on magically seeing as the men wants them back instead of running for their lives.
When I read about the sazae-oni my first thought was "Lilith would love to high-five this girl" http://manalanextdoor.com/lilith
Also, it gave me an opportunity to draw Nini being protective of Jacob for once. Her favorite part of him may be his backside, but she quite likes the front too. ;)