Image imported from derpibooru 
Original Description:
 
When Twilight had embarked on an expedition of Ghastly Gorge in search of fossils, she had written a lengthy risk assessment, with a special focus on Quarry Eels. Unfortunately for the educated equine, she had glossed over the local leeches as she had assumed them little more than a mildly irritating parasite. This assumption would quickly come back to bite her, when her little adventure ended abruptly with an engulfing encounter with a particularly large annelid…
 
My seventy-sixth sketch from Silent_E ‘s patreon.
 
This ravenous annelid was kindly coloured by my friend plaguetyranno .
 
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https://discord.gg/cVeAghu
 
A story in the source as always, please don’t repost in the comments below :)