A story about the end of love in the worst possible form, with no salvation whatsoever.

A story where no one is saved. Viewer discretion advised. The protagonist still treasures their first love to this day. They continue to maintain a family-level relationship with this first love. One day, the first love's child is taken a fancy to by royalty of a suzerain state and is about to be abducted as a slave. What will the protagonist do upon witnessing this? Also posted on Alphapolis.