I don't wanna give away too much, but there is going to be a discovery from two different sides of the Hogwarts lake... Oh and if I make any major mistakes with the language -please tell me and I will correct them.
The Mermaids Prank
The blue tuggle-weed was never found at the bottom of the lake that was why I had come up in the first place. I found it quite quickly, hidden behind some stones and it wasn't hard to cut it either, even though the shell I used was already getting a little blunt. I stuffed the weed under the leather band that held my hair behind my ears and let the shell go. She wouldn't be much use anymore anyway.
Being done with my daily chores way too early, I went for a stroll and swam along the muddy walls of my home. I had never seen any other place than the lake of course, but then again I would probably never be able to get close to even see half of all the hidden mysteries of this gigantic pond. I had never felt like missing out on anything either. My whole life, my family and friends, everything I knew and everything I would ever need were to be found in the deep waters of the lake. I was happy here. I didn't swim so close to the lakes walls often and I was eager to touch every stone and plant I saw. Everything smelled so different, everything felt so different. I guess it was because I had swum up to the higher levels of the lake. Looking up I was surprised to even see a glimpse of light shining through hundreds of thick layers of seaweed and eelgrass. As I began to swim closer to the glittering light a rush of my hands made the seaweed move and a hole emerged inside the green wall over my head. Blinded I winced, pressing my hands over my eyes. This light was much too bright. Brighter than anything I had ever seen before. After a little while I dared to peek through my fingers. The gap was still there and so was the brightness. I knew what it was of course: the sun. I had seen it before, but never this close. We merpeople never swam this close to the end. Except for special occasions. But then again it wasn't actually forbidden to do so. Holding on to this thought I allowed myself to get drawn up by the sun even more. It was almost magical the way I felt. I really wanted to be there were all the light was. I just had to be there. Suddenly I was up close enough to just reach out my hand and touch the end. The end of our world, that was. I could see the light falling onto the water of the lake and how it changed up there. I pressed myself to the cold wall of mud and stretched out my hand, to feel whatever it was that lay behind the water.
The moment my finger was just an inch from leaving the water there was something moving up there, something was being put into the water, something in a strange color, but in a familiar shape. I winced again as I saw a finger, than a hand being stretched into my lake. The strangest color of skin I had ever seen and fingers that seemed to be made of much tougher flesh than mine. Entranced by the mystic vision I stretched out my hand once again and touched the strange finger with my own fingertip. Instantly the hand disappeared and I could hear strange sounds in a distance, shrieking in fear as it seemed. I swam away from the spot, but came back a minute later, waiting for something to happen. It took a little while, but there it was again. My mystical hand that shimmered in a nearly silvery color, stretching out. Reaching out for something in the water. Reaching out for me I realized. Unsure what to do I swam another circle around the alien hand. The silvery fingers moved in an unknown rhythm, as if to attract me. It worked. I really wanted to touch that hand again.
To feel that warm flesh one more time. I swam closer and closer, reaching out for the hand. Suddenly there was a noise below me, I turned my head just to see a fat goldfish passing by. I wanted to shoo it away, but I remembered the reason for my outstretched hand and while I was turning again, to look for the strange hand above me I saw it grab for my wrist, pulling it into a tight grip, tearing me upwards, out of the water.