[Orukaniumu] A story about how Demon Lord Ranko-chan gets tricked by a wicked merchant into having her breasts expanded by a slime [English] [FutureCop]
If the slime was a parasite, wouldn't it have consumed the nutrition instead of ejecting it? It'd be a nice monkey's-paw twist of irony to have the slime absorb the breast milk, hence granting her wish of not having to deal with the breast milk at the cost of bigger, incredibly lewd breasts that release sexual energy to seduce (pacify) everyone around her, perhaps a defense mechanism to keep the host alive.
@Earthen Caulk maybe it's a modified parasite with the sole purpose of turning into her tit flesh so it doesn't have to fullfill any of it's normal biological roles.