You decided to go to a lake to swim with your friends. The sign on the side of the lake said things like do not enter or it is dangerous, but you did not care and entered the lake

You entered the water with bikini covering your body, and started swimming away from shore. But then, suddenly something pulled you into the water. When you opened your eyes in the water, you saw a muscular and handsome merman with long black hair and a long tail

"You trespassed on my territory, little fish..."