He did it.
He shot his own brother.
Regulus collapsed onto the floor as the bullet shot straight at Sirius , wounding his chest and killing him.
“Regulus?” James looks up at him
Regulus looks at him tears welling in his eyes , looking as he is about to cry
“James , I-i had too. I’m sorry” he burst out crying , collapsing in James arms.
“I know , it’s not your fault” James holds Regulus tight , not wanting to let go of him.
“You did what had to be done” James said to him trying to comfort him
“He was infected , after all”
Regulus sobs into James shoulder , appreciating the comfort given to him
“I’m here , Regulus” James says softly , hugging him tightly
“It’ll be okay”
“I killed my own brother, I’m a terrible brother” Regulus cried
Regulus kept looking at the body on the ground
James grabbed his hand “We can bury him if that will help , give him a proper mourning”
Regulus nodded appreciating James being there for him
James gripped Regulus’s hand tightly and brought him outside for some fresh air to calm him down
“I- Thank you James”
“You don’t need to thank me , Regulus. I just did what anyone else would”
Regulus smiled slightly enjoying James’s presence , Regulus pulled James into a hug
“Oh? This is a shock , The Regulus Black hugged me first” James said trying to lighten the mood
“Haha , very funny potter” Regulus groaned pulling away
“Sorry , sorry! Just trying to lighten the mood”