It was midnight - cold windy night. Harry decided to take a midnight swim in the lake...splash, he jumped into the water, gasping as the cold, icy water surrounded him and then accidentally shallowing a mouthful of water down his throat. He quickly shut his mouth and drained the rest of it down his throat though the taste of it was not so pleasurable as drinking a nice, clean fresh water from a tap. The water tasted more dirtier and more saltier, it had little gunk of broken-off seaweed that made it taste even worse and slimier. Push, stroke, kick it was all he needed to do to be able to swim, he pushed himself deeper into the water and explored everything around him; bubble forming and flowing out of his nose and popping as the pressure of the water was pressed onto it.
Harry continued to look around, still trying to keep himself afloat in his position and saw a ruin down below. To his dismay he turned around and saw a tail whipping in front of him. It took only a few second for him to realize what it was -- it was a female merperson or whatever they called when it was only one merpeople, cause to him it sounded like the plural. All of a sudden a quite, musical voice filled up his ears it sounded like a lullaby; the merpeople were playing a lullaby and it was so lovely he forgotten to breath so after a few second he realized he wasn't breathing and felt like his lung was not functioning anymore because of it lack of air. Quickly, he swam back up to the surface and when he got there he gasped and ran his hand up his face and through his hair, pulling it back.