Rabbit

There was a moment of clarity for Regulus one New Year's Eve, in foolish stubbornness the rest of the family would have associated only with his older brother.

Disclaimer - I do not own Harry Potter. This fulfills the monthly Froday challenge for March 2022 which involved writing a story based on a TV or Movie quote and I picked the "Bond, James Bond" quote. It also fills a prompt for the Harry Potter Prompt Meme.