This is Sirius's side of the story, The Difference Between the Past and the Future, It is a short one but I thought it was cute.
Enjoy!
Disclaimer- I own nothing
Sirius's side
She was beautiful. There was no question about it. Everyone noticed, well except James but he had only eyes for Lily. But her eyes caught Sirius's attention. They confused him. Her eyes held the story of something beyond their time. She looked at everyone as if she would never see them again. She looked around and seemed almost ready to burst into tears. More than once she had, she had either ran to Lily, or to the Library. Sirius had, the first night after they had met her, decided that she needed to learn a lesson in who ran the school. His animagus form looked an awful lot like the Grim so it was the perfect opportunity to get her back for raising her wand against James. He had waited for her until she saw her down in the corridor, a little wandless magic took care of the torches. But instead of running away she walked past him. Sirius would never forget what she had said.
"I know it's you, Padfoot." He thought about it the whole two weeks she was there. How did she know? How did she figure it out? He watched her with a frown, that is when he had noticed her eyes. They were to haunted as if she had seen too much. James had waved off his observations and worked on Lily. Sirius watched her with open curiosity. She had looked at him and then James one day and burst into tears. Sirius had followed her. She had stopped in the Library and into the arms of one Severus Snape. Sirius had frowned but watched curiously.
"It's just they are all so happy! I want to tell them! I want to!? But we both know I can't." Sirius had wondered around thinking about what she had said. The two weeks were up and she left. Snivillus became more sour and bitter and if Sirius didn't know better he would have said that the angry boy was in love.
Years past and the rise and fall of Voldemort and more importantly his incarceration in Azkaban. He felt his joy being drained and that his soul was empty. He waited and waited before managing to escape.
Then he had saw her again. The Ms. Hermosa Ange. There was no recognition in her eyes as she looked at him. She was younger too and her eyes were filled with the innocence of youth. He thought about what she had said in the library. 'It's just they are all so happy! I want to tell them! I want to!? But we both know I can't.' She was a time traveler. That explained everything. Her haunted eyes, her tears, the strange looks. But this girl wasn't Hermosa. Her eyes were fresh adn new. They didn't know the dangers of the world. He would have to inform her.
At Number 12 Grimmald Place, he had cornered her and was going to lecture her about the use of powerful magical objects but he stopped for a moment and told her he was proud of how she helped Harry through everything. He told her that her decisions would always change her future and the futures of those around her. That no matter what she did he would be proud of her, always. Why he didn't tell her about time traveling, he had no idea. He didn't get another chance because a few days later, caught in the middle of a fight at the Ministry of Magic, he died.
Well what did you think? I know I know it was really short but I couldn't figure what else to write with it. But please feel free to tell me what you thought.