Harry Potter

Harry was in his fifth year. Right now he was in his room, looking in the mirror, but he wasn't seeing his reflection; he was seeing his parents' past thanks to a spell he'd found.

For some reason, there is one person who is always, without fail, behind James and Lily, a beautiful ethereal woman with straight black hair as night and pale skin without looking sick, apparently she is a Slytherin given her robes.

That woman always looked sadly at James and Lily. Harry's memory flashes back to the past; in that memory, James was with that woman on his lap, they seemed very happy and in love.

Harry was confused and waved his wand to see a future memory, where that woman was holding a baby and James was with her.

"I'm sorry, but I love Lily," James said simply, and the woman looked at him incredulously.

"But James, Harry is our son, you can't do this now," the woman begins to cry.

"Well, Lily's going to adopt him, but I don't want to see you anymore. You were just a fling for me." James takes the baby, and he starts to cry. "Now he'll be called Harry Potter Evans."

Harry quickly moved on to the next future memory, where that woman was crying. He wants to see another memory, but his head starts to hurt, so he decides to continue tomorrow and go to sleep.

While she slept, she sensed a change in the atmosphere, but she didn't think much of it, assuming it was her owl that had opened the window. But when she woke up, she was no longer in her room; she was in a more rustic version of it.

He leaves confused, going to the common room, noticing the slight change in the decor. He goes outside and starts walking through the corridors, stopping when he sees someone in the distance, that beautiful woman, only thinking one thing he said out loud, but in a whisper.

"Mom?..." Watching her from afar laughing with her Slytherin friends, she realized what had happened.

He traveled back in time, more specifically to before that woman became pregnant with his child and before she dated his father.