There is no interruption from Moriarity, and Sherlock is sent away on the plane. Mycroft can't intervene in time, and Sherlock is killed.
A few months later, Mary's baby comes into the world as a pale, crying child with dark curls, blue eyes, and high cheekbones. (Baby can be male or female, I'm not picky - after all, Sherlock IS a girl's name...)
They name the child Sherlock in honor of the best friend they both lost, and for a while life is normal.
Then the child starts to grow up, and shows a strikingly familiar amount of cleverness - especially when it comes to solving mysteries. Sherlock has been reincarnated as their child, and John and Mary will do ANYTHING to protect him/her.
Sherlock reincarnated as John and Mary's child
A few months later, Mary's baby comes into the world as a pale, crying child with dark curls, blue eyes, and high cheekbones. (Baby can be male or female, I'm not picky - after all, Sherlock IS a girl's name...)
They name the child Sherlock in honor of the best friend they both lost, and for a while life is normal.
Then the child starts to grow up, and shows a strikingly familiar amount of cleverness - especially when it comes to solving mysteries. Sherlock has been reincarnated as their child, and John and Mary will do ANYTHING to protect him/her.