I just read this anko, so I thought I'd dig up the picture here and post a synopsis. Do you guys care about anko-story spoilers? Since Danbooru's got spoiler tags, I figured I might as well use them.
Anko 2156: "Let's Go Home Easy," by Osekkyou-saretai-aki (This illustration by Kurumada-aki) (Additional illustration for story: post #25078)
Synopsis: A child Marisa goes out to play at her friend Chen’s house. When she doesn’t come home in time for lunch, mother Reimu goes to look for her and immediately finds a sweet-smelling, delicious black lump outside their house. She brings it home for her family’s dinner, then heads out again. At Chen’s house, nobody is home, but inside, Reimu finds two more of those black lumps. A mister human sees Reimu and gives her some black sweet-sweet pellets, which she eats. Reimu finds herself getting wearier and wearier as she gives up her search for Marisa and heads home, and her hair and accessories begin to decay and fall off.
Ending: Reimu begs a nearby human for help, and the human takes a package of the black pellets out of his(?) shopping bag and explains that it’s a yukkuri poison that gives dying yukkuris the urge to return home after they’ve eaten it, and then their bodies are eaten by their families and poison them, killing the entire nest. Reimu sacrifices herself by throwing her body into a river, but meanwhile, at home, Reimu’s two babies get hungry and start eating the black lump (actually their big sister Marisa) that Reimu had brought home. When father Marisa comes home in the evening, he finds three sweet-smelling black lumps in the house and begins eating.