The Other Son (Christmas Bonus): A short-story length sequel for The Other Son

DO NOT READ THIS STORY if you haven’t read The Other Son yet. CONTAINS SPOILERS.

This is a mini-sequel to The Other Son, a little gift (short-story length - 40 printed pages) for all those readers who have been begging to know what happens next.
It will be offered free of charge for 5 days every quarter (the maximum permitted).