31 Days of Monsters: Cambion

This one deals with the birds and the bees, so it's a little NSFW. When demonic Succubi and Incubi feel the desire to start a family the Succubus mommy collects sperm from a human male victim and then passes it on to the Succubus daddy. He in turn passes it to his next female victim who eventually gives birth to a Cambion. Cambions possess none of their parents seductive manners, but are prized among demons for their corruptive influence on human society. Cambions can be recognized by the absence of a pulse until age 7, and their dislike of signs of affection. They also hate cartoons and sugary cereals.

31 Days of Monsters: The Lidérc

If you take the egg of an all-black chicken and incubate it in a pile of manure, it will hatch into a lidérc. A Hungarian shapeshifting demon that attracts money to its "owner", a lidérc can also transform itself into a fantasy lover for its master much like an incubus or succubus. If kept too long however, a lidérc will begin to drain the life from its owner, delivering the victim's soul to it's real master, the Devil. The best way to rid yourself of a lidérc is to give it an impossible task to complete. If unable to finish the task, it will either return to Hell or tear itself apart in frustration.