Grue girl!
 
This type of Monstergirl can be best described as an enigma, wrapped in shadows, that's prone to violent rape. To describe a Grue-girl's appearance is to only be able to talk in approximations; considered to be rare specimens, eyewitness accounts are often sketchy and unsatisfactory. Common descriptions reveal a slim, female figure, that seems to be constituted of smoke-like shadows; when seen, (almost always a single glance from the corner of one's eye as she stalks her prey) they are described as manifesting themselves through and /of/ darkness, apparently using it not only as a medium for movement, but of disguise.
 
Physically individuals of course deviate from the norm, however several features are often repeated, first and foremost: Grue-girls posses truly gruesome jaws, filled with blood curdling teeth, the effect is only heightened by the fact that these fangs are often the only part of her that will catch light, yet her eyes are also known to catch the light in some cases, much like a cat's; this combines to create the truly unsettling vision of a disembodied set of jaws and eyes pouncing upon an unwary traveller. Said travellers, soon well acquainted with the Grue's body describe them as slim, but strong, with often small, but quite perky breasts, and their rear assets are often the object of much praise. Less praiseworthy to the prey, but very noticeable indeed are the Grue-girl's rather gruesome paws, each large, misshapen hand crowned with a collection of razor sharp, jagged claws. Beyond this description imagination and sensationalism reigns; some have described fanciful cloaks made of shadow, others report tails, some even suppose Grue-girls have wings: such presumptions only serve to highlight the dearth of knowledge available to the curious mind.
 
However, unlike their appearance, much is known of the Grue-girl's temperament, as it is often the only way most experience a Grue's rather unique "charms". Described as shy, but possessing a vicious, cunning, predatory instinct; a Grue-girl will stalk a man, until (flitting through the darkness available) she nears her target, closing in on him unawares till she is well within range. Having caught her prize a Grue-girl will then viciously have her way with him, almost if she ate him body and soul, the man is so exhausted. Preferring oral stimulation when on the attack the Grue-girl will pounce in to the darkness if the man's crotch, destroying his clothes, and readying him for mounting if she so wishes. With such a technique any man whom wears clothes can be at her mercy.
 
The caveat however can be strongly within the quarry's corner! For if the man is sharp and manages to spot the predator, she freezes in place and simply can not function, such is her surprise at being seen. Having been "caught" herself, the Grue-girl becomes deeply enamoured with the quick witted man. She'll stalk the man to his home and take up residence, at the beginning flirting and flitting in and out the corner of the man's eye, pouncing on him from the darkness in his own home until it becomes that any dark room portends rape for the poor soul.
 
As with many Monstergirls, spending time with her chosen prey allows her presence to grow, until she becomes more and more solid in the home the two now share and it seems that she can no longer content herself to ghost out of dark corners and suck the man dry. Soon the Grue-girl will dim the lights of the home and manifest more often until it's with perfect clarity amidst the darkness that both parties realise that they're well and truly trapped with one another in the gloom of their home.
 
Some would say, rather unfairly, that such a girl is a sadist and a predator, irredeemable in modern society, however many find that when a Grue-girl takes up residence in their home, one can easily turn the tables on the fearsome girl. True to her nature as a creature of the dark she's still painfully shy, if a man can catch her before she can pounce on him, or if he can force eye contact and deeply stare her in the eye the Grue-girl'll stop stock still. If he's quick and can grab her before she can disappear back into the comforting, safe dark, she'll easily submit to her quarry, suffering the change of relationship dynamics with a girlish, loving but lascivious smile.
 
The more often the man accomplishes this task, the quicker the Grue-girl will integrate herself into the mans life and household until finally their love life becomes a cute cat and mouse of caught and catcher, of searcher and fugitive, often switching between submissive and dominant with practiced reflexes and attuned attention. Once a Grue-girl has installed herself into your home, you're already caught; with all her heart she will pounce upon you, and raping you again and again with a gloating look: a predators right to her prey. However if you catch her, the Grue-girl becomes once again the shy girl hidden deep within her predatory instincts, and will submit her body and soul for ravaging; until both become entwined heart and soul, until both Grue and man become experts in hunting and hiding, until both love each other madly and deeply in their dark haunt forever more.