The Tentalicus Hentailidae, also known as the Greater Cave Tentacula, is a reclusive and mysterious beast that reproduces by breeding with other species - specifically, ponies. Though few have ever encountered one, rumors hold that their method of mating is more passionate and personal then anything else in the world.

Twilight and Rainbow get to find out for themselves when they wander into a Tentacula's territory, while on a journey into the Everfree forest to see strange and exciting creatures... while in heat. Well, they'll get what they wanted...

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Contains: Tentacles, tentacle bondage, seduction via pleasure and aphrodisiacs, threesome, multiple penetration, endosoma (nonfatal vore), estrus, impregnation, feeding via tentacle, temporary mind-linking/merging, abstract philosophical concepts, Lovecraftian Erotica, and the most hardcore consentacles you will ever see - or at least that's what I'm going for.

Inspired by the art of Phantim on Derpibooru. Browsing through the "Tentalicus Hentailidae" tag on Derpibooru, I was taken - smitten you could say - by Phantim's descriptions of the Greater Cave Tentacula and how it breeds its mates. I was inspired to write a fic - and Phantim approved of the idea and even made a cover pic for me! Anyway, you may find out more about the Tentalicus Hentailidae on Derpibooru, although bear in mind Phantim prefers to work with anthros, whereas I went with standard pony form for this fic. I've also taken a few liberties here and there, since I need to overthink everything I do. Even porn.

The first chapter is standalone. I marked it as incomplete because I really liked working on this, and there is material for a continuation.