The Bicorn is a variant of a Unicorn that has an alluring black coat and two horns. If a Unicorn has sex with a non-virgin or if her husband cheats on her, the demonic energy of her husband’s other partners along with his spirit energy pours it into her. Due to this, the demonic energy of the Unicorn, which had been kept pure, becomes mixed with another woman’s demonic energy and gets corrupted, changing into the demonic energy of a Bicorn. This, in turn, changes the Unicorn into a Bicorn. They have the same gentle disposition and graceful behavior as other Unicorns, however, their true nature is exceedingly lascivious, and these monsters are regarded as a “symbol of impurity,” celebrating a lustful, and hedonistic existence.
Though wildly lustful, Bicorns do not forcibly rape men, but they are adept in the ways of arousing lust in men. Men that they go after will be unable to resist their sweet temptation, and will eventually have sex with them. Exactly opposite of the monogamous Unicorn, it’s in a Bicorn's nature to prefer a polygamous harem arrangement where their husband has many monsters as wives. As far as they are concerned, their husband becomes a more lustful, hedonistic existence by having sex with many monsters. Also, letting many women know the taste of their beloved husband brings them more joy than anything else. Additionally, their husband’s spirit energy, which gets mixed and corrupted with the demonic energy of various monsters, becomes like a cocktail, and it is said to be a Bicorn's favorite treat.
Normally, the demonic energy monsters pour into a male asserts that he belongs to them, and functions to repel other monsters. However, the scent of a male’s spirit energy infused with a Bicorn's demonic energy ends up becoming thicker and stronger, which causes him to become extremely attractive and delicious looking to other monsters. Just the opposite of other monsters, the Bicorn's demonic energy attracts other monsters to their husband. Of course, this goes for the woman who caused a Unicorn to become a Bicorn, but if there are any other women whom her husband desires, or vise-verse, she’ll train them into lascivious monsters that are appropriate partners for her and her husband, making them a member of the harem for the husband’s sake.
Even should their husband be resistant towards the idea of a harem, she’ll lure him into it by sprouting the seeds and fanning his desire for other women. Additionally, every time a new monster joins the harem, the Bicorn's demonic energy grows relatively thinner, so there is a limit to the number of members, but it’s probably easy to make a small scale harem of about 5 or 6 people.