the key and the lock

Once in a life time some might know there was a key given to a girl who had to keep it on her at all times if it was lost or stolen she would evaporate with in 4 days as songs will haunt her at night drawing little by little her sanity little by little till she drops and evaporate leaving everything unsolved. then there was a lock given to a boy that if he lost it he would begin to slowly be turn into dust and weather away within 4 days and every night he would be even more tired then when he went to bed