Cast part uno

What happens when the golden trio go back in time? More specifically the Marauders time. What happens when they find out someone existed that he didn't know existed. Secrets are unraveled and shocking new revealed.
Find out those secrets reading 'The Slytherin Heir'

Disclaimer I do not own any of the characters except for Elizabeth. All other characters and settings belong to J.K. Rowling the original author. And everything else belongs to its rightfully to its original owner. And this is my first book so it's obviously cringe, so yeah just don't read it.

(Edited)
(Regulus Black x OC)
(Not a slow burn)
(Will eventually be re-written)