Esther 9:15 records the Jews in Susa killing 300 more on the 14th, fulfilling Esther's request for a second day of action.

Esther 9:18 explains that because of the extra day in Susa (requested here), Jews there celebrate Purim on the 15th instead of the 14th.

Esther 9:25 summarizes that Haman's plot was overturned and his sons were hanged — directly alluding to the hanging requested here.

Esther 8:11 is the original edict granting Jews self-defense. Esther's request here extends that edict for another day in Susa.

Esther 5:11 records Haman boasting about his many sons. Here Esther asks to hang those same sons — a dramatic reversal from pride to shame.