The Forgotten Eighth Sin (Reader x Meliodas)

You are the Forgotten Eighth Sin, The Fish Sin of Forgetfulness. Everyone had forgotten the forgetful sin, no one, including the other seven sins and yourself remember you are a sin. In fact you don't remember anything except the past ten years of your life. The sins remember you but they don't remember how. After ten long years you are reunited with the sins and slowly you begin to remember the past, the good times and the painful times.