Incubus

-->This page details the male sex-demon, masculine counterpart to the Succubus. For the Dark Eldar unit from Warhammer 40,000, see Incubi.

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An Incubus is a male demon associated with sexual pleasures and vices, an embodiment of the sin of lust. They are the male counterpart of the Succubus, but get far less attention because, well, fantasy settings are full of near-human monstrous males who rape human women (see: orc, ogre, goblin) and they just don't interest the average fa/tg/uy the way that monstergirls do.

It doesn't help that it's been suggested that incubi are literally just succubi shapeshifted into men.

Dungeons & Dragons

The incubus as a demon in Dungeons & Dragons doesn't have a very long history. Their succubi sisters have stolen the show in almost every edition, but they have squeaked through here and there.

In 3rd edition, incubi embody "male sexual evil" in comparison to the succubi embodying "female sexual evil". This means that whilst succubi embody temptation and spiritual degredation, incubi embody rape and sexual violence. Appearing as shark-toothed, black-eyed, handsome men with gazelle-like horns, cloven hooves for legs and lashing tails, they retain the level-draining abilities of their sisters but have none of their subtler charms. Malcanthet keeps huge armies of them on her layer of the Abyss, but she finds them dull and vulgar brutes, keeping them out of sight as best she can and using them only as armies to defend her layer against the inevitable attacks by rival Demon Princes or angels.

In 4th edition, incubi are corrupted succubi; servitors of Grazz't, when the Archdevil entered the Abyss and turned into a Demon Prince, they likewise were corrupted into primordial entities of untempered lust. In this edition, incubi and succubi are actually gender-neutral terms referring to specific kinds of lustful fiend, so you can now have a female incubus in the same way you could have a male succubus in previous editions. The incubus of the World Axis is an adept shapeshifter, able to take on mortal, beast and dream-forms, allowing it to prey upon the minds of those who attract its attention as well as their bodies and souls. They often work to form pleasure-cults, dedicated either to themselves or to Graz'zt.

In 5th edition, incubi and succubi became indistinguishable; a single Neutral Evil lust-focused race of fiends with male and female members.

Monstergirl Encyclopedia

Incubi are integeral to the lore of the Monster Girl Encyclopedia - whatsat? How can an incubus, a by-defininition male monster, become a monstergirl and still be called incubus? Well, don't worry, they're not dickgirls; it all has to do with the heavy Corruption Fetishism that the setting is built on.

See, the MGE world runs on the principle that there are two main kinds of mana; Spiritual Energy, produced by humans, and Demonic Energy, produced by mamono. Demonic energy consumes spiritual energy, sort of like necrotic energy in D&D. As such, when a human is innundated with too much demonic energy, it changes them. Women turn into monstergirls; the "lesser succubus" is the iconic form of this, but virtually any monstergirl is possible depending on various factors. Men, on the other hand, don't react this way (barring gay men, who turn into reverse-trap succubi called Alps) - instead, they turn into what are called "Incubi".

In the MGE world, an incubus has absorbed so much demonic energy that it forms a ying-yang cycle with their spiritual energy (long story short, men produce spirit energy far more frequently and copiously than women do, which actually has its base in real Asian beliefs about soul energies, but still feels kind of skeezy). This results in them transforming into masculine "pseudo-monsters"; their bodies change into a more idealized form (youthful, slender, handsome), their virility and stamina increases massively, their personality becomes much more hedonistic and sex-obsessed, and they get some other benefits too.

Because men don't corrupt as easily as women, an incubus never comes into being unless a man has heavily bonded with a monstergirl lover - there are certain overpowered mamono who can force a near-immediate corruption in men, such as the Basilisk and the Ushi-oni, but they still "imprint" their essence on the new incubus. This has certain side-effects. The first two are that, one, the incubus can now physically sustain himself through sex with his bonded mamono, and two, the incubus is "marked" in the eyes of other monsters, which may either prevent them from trying to court him or encourage them, depending on their attitude towards monogamy & polygamy. Another side effect is that their physical appearance will shift to fit their bonded mamono's preferences - this won't make them physically inhuman, but if their wife is, say, a shotacon, then they'll end up looking like a young boy. Mind you, mamono bonded to an incubus find their subtle physical traits shifting to match his idealized form - which doubtlessly leads to amusement when a loli mamono snags herself a man with a tit fetish and winds up an oppai loli. Finally, the incubus will pick up various subtle mystical powers to better match their chosen mate(s), such as breathing water, tolerance for extreme temperatures, darkvision, etc.