The medicinal botanics greenhouse of course

As Adrian decided to go to the more medicinal touched part of the gardens, he was greeted by the usual smell of the magic flora and fauna seemingly dancing with the wind. The strong scents caused a lot of bees and other insects to flock to the schools famous consortium of plants.

As Adrian followed the little signs, he soon spotted the row of plants. Marked with a little wodden sign that was simply stating "Nesseln. For Professional use. Please consult teacher.".

I mean, technically I am here on a kind of teachers notice... I know a lot about plants and I am guessing I can just... pick those nesseln up? Meh, whatever

Adrian moved closer to the little green leafs forming out of the rich soil. They seemed to be moving slightly back and forth - in no connection to the wind around them. As he tried to grab one of the leafs and pull them out - no matter how hard he pulled - neither the plant nor the soil moved an inch.

What the fuck? Do I need to cut them? really? Maybe I really should ask Sprout. But then again... she is probably too busy anyway.

In that moment, the leaf bend itself around his hand. Adrian jumped up a bit with a squeak, but found himself trapped by his hands onto the thick leafs that had bound him. As soon as he had calmed down and mustered as much strength as he could, he heard slight cracking behind him. When he looked back, he could see another pair of green leafs extending and bending around his legs. Hugging them tightly.

"Fuck, let me go! What in Merlins bloody Panties is happening??"

With immense speed that Adrian hadnt thought possible a plant could achieve, a third Nessel-plant had sprung forward and laid itself onto his mouth - practically gagging the young wizard and making him unable to call out for help.

A slow fear crawled up Adrians body, as he found himself not able to either move or get help. His wand was snug into his waistband, and with no way to get to it, he feared what was going to happen to him. How long till someone would find him? and what could the plants be doi...
but it wasnt fear that was crawling up his legs. It was one of the thick roots of the big Nessel slowly extending and creeping up his pants leg, already having moved the wizards robe aside.

This cant be happening

The Nessel Root had reached his hips and, with a sensible twist and turn, ripped open the front of them - letting his pants fall lose and his wand roll some half a meter away on the lose soil.

*It's not going to... it's a plant.. it's surely no.."

... but it already did. With immense strength the root had ripped apart his underwear and moved him onto his stomache. Adrian had closed his eyes - trying desperately to remain calm and to think of a way out. He had never read about Nesseln doing such a thing before. Given that he only ever heard about them by Madam Pomfrey using them as kind of magical bandages, but still - no way would a dangerous plant be left near the student body.

Adrian took too long - and without finding any resistance, the wet, clean and glossy white root had found his back entrance and with no hesitation had started pushing in. Adrian bend his back a little - the immense sharp pain he had just witnessed bringing him to cry out into the leave in front of his mouth.
The root had fully penetrated him in seconds, and soon started moving in and out, slightly spasming and wiggling when inside.
Adrians backdoor was blown open, and the pain, although persistent, soon found itself partnered with a warm and horny sensation. The root must have found his prostate, and had started massaging during every thrust.
Without Adrian noticing, another set of roots had moved under his hips and lifted him - His ass up and his face down. He was starting to moan deeply. Unknown sensations coming over him.

His whole body was being thrusted forward with every push of the root. Adrian was starting to grow hard. His erection dangling.

As the Nessel continued its ****, Adrian started to wonder in between his moans. Why was it that the Nessel had started to ... fuck... him? Didnt Madam Pomfrey know this would happen?

Adrian was thrust forward in one big push. The root filling up his backdoor completly, and adding a unfamiliar warmth in consistent spurs. The plant seemed to have orgasmed inside of Adrian. Slowly it retreated outwards - its botanical cum leaking down his asshole in slow white drops. The leaves bend back, letting Adrian fall to the ground and onto his back. His hard on reaching into the air while he was blacking out.