The Maidenhead Wasp

Full Description
Wasp is something of a misnomer for this creature. They do bear a resemblance to a wasp, but they have a more slender body shape, and their armored exoskeletons shimmer with a rainbow of colors, as do their beautiful gossamer wings. Furthermore, these are much larger than an ordinary wasp, generally two to three feet in length, with at least a three foot wingspan, sometimes up to five.
They generally live in tropical forests, where there is an abundance of fruit and nutritional leaves that are easily accessed. Apart from these two criteria, they require a warm, moist climate, and little else.
These are among the strangest creatures in existence, not for their appearance, diet, or anything about them but for their reproductive method. An adult Maidenhead (there are no males, only females) breeds by laying its egg in the body of another creature, which is not so odd. The odd part, however, lays in the fact that it only lays it's egg (it produces only one per year) in a male of another species. This is it's method of circumventing the fact that it has only females of it's own species. It will implant its egg in any warm blooded creature of sufficient size, usually at least a hundred and fifty pounds, so humans fall in it's range - and are, in fact, it's preferred incubator.
Another odd part about this creature is the way in which it does this, which has earned it the status of a holy creature to many peoples who share territory with the creature, and implantation is actually, in some of these places, something to be desired, as the ones who are implanted are taken care of like kings, and since the larva actually does not kill its host. The reason for this is because the males that have experienced this are said to understand both sexes, and so to be very wise. Also, since the wasp itself is so benign and brings goodwill wherever it goes, it is revered as a holy creature The adult female, which is about two years old when it reaches reproductive age, lures a male by secreting a powerful version of the pheromone secreted by the female of whatever race it has detected. It targets only lone males, never when they travel in groups, for the next phase of its plan to work more effectively. The pheromone, since it is many hundreds of times more powerful than the normal version, has an almost instant hypnotic effect on the man, causing him to forget Whatever he may be doing at the time and follow its call to the wasp, who will then sting him once with a chemical that will knock him out for several hours, while the wasp injects an egg about the size of a golf ball into his stomach, along with a collection of slowly degrading anaesthetics to keep him from noticing its presence until it hatches. The wasp then injects him with another compound, an exceptionally powerful healing agent that is extremely valuable as a healing potion, but almost impossible to obtain - after all, the wasps ability to mimic almost any hormone, male as well as female, renders people incapable of harming it. The wound from the injection will heal by the time he wakes, leaving him only with a vague memory of being seduced by a beautiful woman in the forest.
For the next week, the man will notice little different, and will almost certainly forget all about the experience, from the effect of all the chemicals the bug pumps into him. However, about one weeks after the implantation, the larva inside him will hatch, and start to extend tiny tendrils from its body, winding around his nerve fibers and the vessels of his body, pumping chemicals of its own into him. The effect of this is almost immediate - he will be almost insatiably hungry for the first few days. After he has gorged himself, likely wandering off into the forest to eat leaves and other things he normally wouldn't (the larva allows him to digest these things), it will calm its torrent of hormones and start to work more slowly - but the effects will be drastic.
The man will start to behave oddly, even the bravest of men will shy from any danger, though is cornered will fight with twice his normal strength, the larva using this to ensure its protection while within him. After that, his body will start to change. Muscle mass will begin to drop, his skeletal structure will shift subtlely, hips will widen, and in about three days he will begin to develop breasts, certain parts disappear... and his stomach will grow considerably - he has, for all intensive purposes, become female, and pregnant at that. While most of his mind will remain intact, he will almost certainly not worry overmuch about this, and will not understand why others might, since the chemicals will induce a sense of well being equal to having a few beers throughout almost the entire 'term'. Also, the host will absolutely refuse to wander more than a few miles from where it was implanted, and will react violently if an attempt is made to remove it from the forest.
As all this happens, however, the urge to eat will continually be strengthened, far beyond that of any normal human, as the larva's nutritional needs are much greater than a human baby. This condition will last for about three weeks, as the larva also grows faster, at which point it will extend larger tendrils into the host's mind and take over entirely. This always happens when the host is asleep, and he (she now, I suppose) will rise and walk out into the forest without a word to anyone. There the larva will find a body of water, and force the host to submerge its lower body in the water, where it will rip its way out, now in an intermediate sort of aquatic state. The host will hardly bleed at all, as the larva continuously feeds the healing chemical into it, and once it departs, the wound will be entirely healed. The host will sleep then, as the chemicals flush from its system and the tiny vascular tubes running throughout its body vanish. He will wake in the morning, very sore, and lost in the forest, but the larva will have, as sort of a final thank you, sprayed the concentrated pheromone about the area to protect it's father from predators in the night - though after carrying it, he will not be affected. His body will return to normal, somewhat stronger even from the final enzyme the larva leaves him with to return his muscle mass and other... parts... to normal. After that, he is free to go on his way, though perhaps extremely puzzled as to why he had such strange dreams of being... pregnant, of all things...
Additional Information
Okay, I know this is weird as hell, and i promise I wont post too many submissions that are this disturbing, but it is an idea I had that refused to leave me alone for the past... oh, year at least. Besides that, I recommend it if you have a male player that is either far too concerned with his masculinity, is far too cocky, a sexist... or anything along those lines.
Finally, I leave you with the thought that I based this off a parasite that exists on our earth today, in the pacific ocean, that does almost this exact thing to male crabs. Sleep well, guys. ^_^