Something in the Water (a johnlock fanfiction)

In this AU of Sherlock, John is a merman who is trapped in a lake nearby the university where Sherlock attends. One day they meet and both their lives are changed forever.

Daughter of Deduction

What if Sherlock and John had to take care of a child? Growing up in an environment with murder and mystery? (I own none of this except Katarina everyone else belongs to BBC)