For eons the plant life of this world has been silent, relenting, quiescent... now, with the world in the shape it's in, the plant community has decided it needs a seeing, thinking, moving representative.
The seedpod in your anus pumps mutanagenic chemicals into your body as it stimulates you sexually; as you writhe in pleasure, within your cocoon, your body changes. You are becoming a fusion of plant life and human intelligence.
Your bones are replaced by hard, high tensile strength wood. Your organs change and some disappear. As a plant, there is no need for you to have a liver or kidneys. Your heart is needed to pump the thin sap that replaces your blood and it is enlarged to be more efficient. It is rebuilt from strong cellulose fibers, much more durable than muscle. You retain a stomach, but this is a back up food processing device. If there is no sun, you may eat as you used to do and gain energy that way. Your lungs grow larger and barrel out your chest. Your entire wooden frame grows making you between seven and eight foot tall. Strong fibrous sinew replaces your muscles and they bulge with strength in green glory. Your skin becomes thick and leathery and very green to absorb sunlight. Your hair is replaced by green leaves and you grow a bushy green leaf beard. In the places you would have body hair, slender green leaves grow, looking like some strange form of grass. Your thick plant muscles are corded with strong vine-like veins. Between your legs you also retain a now magnificent set of reproductive organs. They function very much as your original set did, except now you may mate with any plant and produce intelligent offspring. All you need do is spread your seed within any flower and a hybrid of yourself and that plant will grow from a pod. Your huge spongy rod has a hollow wooden core; your balls fused into one and grew to the size of a lemon. You will derive much pleasure from having these new organs stimulated.
Last to change is your brain. Your body has been bombarded with pleasurable stimuli during the whole process and the drugs that have been pumped into your animal brain have been reprogramming it with simple pleasure stimuli. When you think a right thought, the plant floods your brain with pleasure of orgasmic proportions. You are silently instructed as to what your new function is. You are to speak for the trees, the algae, and the grass. You are the voice of the wood and as long as any part of you remains, you are eternal for you will sprout again. You can reseed yourself as many times as necessary, mating with yourself to create a seed pod that will germinate if you are completely destroyed. The knowledge you gain is transmitted back to that pod through the vegetative consciousness so that the pod and the embryonic clone within will know all you know and be all that you are. Your mind is in communion with the world plant consciousness. You know what the old growth forest knows and have the wisdom of the green ages past.
You are the plant messiah and your message is peaceful, respectful co-habitation with the animals of the world... BUT, if this is not to be, if the voice of the green is ignored, the world can return to the green and all life on the planet will become vegetative life.
Your seedpod has grown huge, but brittle and on a night, a month after the vines took you, your brittle pod burst open, revealing a new life form. You stand for the first time beneath the full moon. You are tall, muscular, bipedal, intelligent and gentle. Your green eyes glitter beneath the moon. You take in your first breath and the trees greet you.
You are the Green Man, Lord of the Forest and Voice of the Plant Kingdom.