I dunno what 'the slime colony story' is but I like where you're going with this... I'm picturing a whole village of kobolds that accidentally eat a little bit of slime mixed with their food and drink, and have to deal with their bellies slowly growing with slime over the course of a few weeks (or months!). They try to cast spells, take potions, anything they can try to get their guts down to a normal size (or at least stop growing).