Here's something else to go along with the plant changes theme with the roses and the tree. My choice of plants is a little obvious i know.

The lesser Freyan picture plant grows only in the realms of Freya. It bears many similarities to the comon picture plant in terms of colour and shape although its method of enticing its primary prey, travelers, differs a little. Its also despite its name considerably larger than a regular picture plant. Its bell like flower could happily accomodate a large adult male.

The plant has an incredible, some would say magical, ability to demoisturise large areas of the surrounding forest or jungle. It sucks the moisture right out of the air for miles around and traps it underground in its vast root complex. It plums itself into the nearby plant life however, so as to keep them hydrated enough to survive. Thus it maintains protection from the elements and an environment to remain hidden in.

However no streams flow through areas where the picture plants grow. Dew doesn't collect on leaves and plants that do grow in the areas around tend to be quite woody and hardy, offering little in the way of water when crushed or rendered down. Even rain seems to dissapear when it falls into the picture plants region.

Thus any unwary travelers passing within a picture plants area of effect usually finds himself getting gradually more dehydrated. Often they are mad with thirst by the time they come across a picture plant but if they are not the plant has a clever way of further ensnaring its prey.

Even the most foolish traveler would recognise the flower of a picture plant for what it is and stay away. So the lesser Freyan Picture Plant instead has large leaves that form basins. Into these basins it secretes a water like fluid that tempts unwary travelers by looking cool and clear as fresh due.
However drinking this liquid is similar to drinking seawater. The victim is driven mad with thirst. They quickly finish off the small pools of water in the leaves leaving the only source of liquid left within the flower itself.

No longer able to think straight the victims climb into the flower sliding down its slippery sides to find the lid sealing shut behind them. The transformative fluids inside then go to work on them.
However rather than a digestive stomach the flower acts more like a womb. The mana produced by the transformation is actually what the flower feeds off.

Inside the flower the traveler undergoes many internal changes however the outward changes largely depend on the gender of the victim. Any men that are unluckly enough to fall inside are gradually changed into women, while women seemingly just suffer a swelling of the genitals. The plant then rehydrates the Victim using its vast water reserves and eventually releases her to wander away dazed and confused.

Back in society they find that the change has caused an increased libido and they often wind up in the sex trade or simply becoming addicted, begging for sex where they can. Their puffy swollen genitals usually prove fairly popular and they never want for sex.
The changes continue inside them however and their genitals continue to grow as they have more sex. Its usually at this point they wind up in the bizzarre sex scene selling their services to brothels that cater to more unusual tastes.

A very few actually research the changes and find out what is slowly happening to them from past reports of it happening to others. Some of these even go on to practice abstinence in an attempt to stave off their trasnformation. They are a small group however usually made up of people outside of freyas realm that fell victim while travelling. The group have actually formed a nunnery of sorts just outside freya's realm. They work to care for victims of this particular transformation while helping eachother to acheive abstinence. They also work to raise awareness of the various transformative dangers in the wilds of Freya's realm aswell as seek out people they believe could be suffering the same changes as themselves.

Their work is in someways futile however. Any contact that that arrouses them will advance the changes in their bodies, albeit much more slowly than intercourse. The heightened sensitivity of their puffy swollen genitals means that even the touch of clothing or the act of bathing will cause them some degree of arousal. Thus slowly all the women of the order are slowly changing. The more they change the more easily aroused they get. Large labia rubbing against their thighs as they walk accelerates it as does the time spent sleeping where they are susceptable to rubbing against the cot they lie on.

Their numbers are constantly replenished by new recruits however and before their change completely takes them each member stipulates wether they want to remain in the order and be cared for or if they want to be ultimately sold to help the order with its monitary needs.

Eventually all the transformee's genitals become larger than their bodies. They wind up as huge bloated pussies with slowly atrophying bodies attached.

By the time the changes are finished their arms legs and head become nothing more than a collection of useless writhing tentacles at the back of a large nearly two metre wide ball of flesh with a huge pussy at the front. They usually have gigantic labia and a huge swollen clitoris that hangs down like a pseudo penis.

These gigantic balls of flesh are continually quivering and the massive amount of muscles that makes it up constantly rubs the inner walls together while the labia are constantly writhing and rubbing against eachother and the hanging clit.

The result being that they are permanently aroused and regulary ejaculate huge amounts of fluid, usually creating small ponds out in front of them before they are found. The fluid is unusual for ejaculate in that it is mostly water and has vary little of what makes normal ejaculate sticky viscous. The fluid is sweet and refreshing and has no known transformative abilities in itself. They draw the water they need from the aptmosphere and feed purely on mana. In very damp areas they are incredibly active ejaculating vast quantities while in more arid areas they still produce a relatively large amount but are more docile.

Because of this these balls of flesh are a permanent source of drinkable fluid and are often sold to desert comunities, helping to supplement their water supplies or to factories that bottle and sell the sweet tasting liquid they produce. Some brothels keep them on even at this advanced stage as there are a few clients that like to sit bodily inside the giant vagina's and let it give them the ultimate massage. There are always people on hand to make sure no suffocation accidents occur though.