[@Lunar] Elves are a type of demi-human in the MGE setting, with greater resistance to monsterisation than human women, amongst other traits of theirs. When a (presumably female) elf goes beyond the threshold of corruption needed for monsterisation, they tend to be banished from their original settlements, wind up heading into human settlements, and then become a full-blown succubus after they first have sex with a human man, retaining a more sexualised version of their original forms, which are in no way beastly. Therefore, "Elf" can refer to both the demihuman race and the monster race, and since one becomes the other, they don't usually become any other sort of monster. Primera, being half-elf and half-human, was an exception - whilst her elven side resisted monsterisation into anything other than an elf, her human side was easily corrupted, thus making her monster form half-elf and half-werewolf, ergo Werewolf-Elf.

For future reference, folks, there's a wiki going over stuff like this. Actually, there's two. I don't know why, but there is.