Disclaimer: J.K. ROWLING owns the Harry Potter world, as is known to everyone.
Quick intro before the actual story.
A HP fan named Jasira Culbert got sucked into the HP world in 1973. I started the story but decided to skip years later to when the Battle of Hogwarts would begin. She found out that the HP world is real and now, coupled with all her knowledge of Voldemort set out goals to change the course of everyone's lives by destroying the horcruxes and letting those who died survive. However, the prophecy is different and due to an incident that occured in 1979 it involves Jasira's entire family to defeat Voldemort once and for all.
It will be a bit confusing, but I have tried to kadd details to make it understandable.
PROLOGUE
Friday, January 11th, 1979.
"Why?" she asked hoarsely, her eyes sparkling with tears.
Everyone stood: the two Potters, Sirius, Marlene, Dimitri, Irena, Sam, Alice, Frank, avoiding her eyes as Jasira stood before them, eyes brimming with tears and fists clenched as she glared at them.
"Jas..." started Dimitri but Jasira slammed her hand on the table, making them flinch as she yelled," Don't! Don't you dare call me that! Not after what you did-what you did t-to him."
"Jasira please, it's not as though as he's dead!" said Irena, her expression frustrated before she instantly regretted her words.
Jasira's eyes darkened alarmingly, and everyone froze at the look on her face. Her usually twinkling eyes were darkening, her mouth was pressed thinly, and her voice was dangerously low as she hissed," You weren't there. You didn't see him! He can't even do anything except just stay in bed. What the hell am I supposed to be doing, Irena? Since you obviously seem to know everything about it!"
Irena flinched but didn't back down," We had to do it. We-"
Whatever last patience Jasira had snapped as she flicked her hand. Irena flew backwards and smashed into James and Sirius, the latter just barely catching her.
"Stop!" Sirius shouted, glaring at the both of them as Irena coughed.
Jasira's eyes flashed before she said in a mocking tone, "Had to do it. Had to do it! How sick can you get? Your own brother, your own triplet brother, and you go and end up making him paralyzed for the rest of his life. How can you even live with yourself? How can any of you live with the fact that you ruined two people's lives? On top of that, you don't have a single bloody reason to justify your actions! I'll tell you one thing:" She looked around with hurt eyes, eyes so full of deep hurt that the others couldn't bear looking at her. "You'll find it hard to earn forgiveness from me, not now, not ever."
None of them replied and the dark-haired woman, looking heartbroken, angry and betrayed, let a single tear fall before disappearing from the spot, leaving the shocked audience behind.