She first saw him when she was 22 years old, and injured on a mission. He was 10 years old, and visiting an aquarium. Percy Jackson looked into Natasha Romanoff's weary but determined eyes, and decided to help her. And so, he pulled a lever, spilling his class and her enemies into a tank. That was not the last she saw of him. By the time several years pass, the two green-eyed siblings by bond will be known as heroes, albeit of different worlds. Perhaps they don't know everything about each other. But they do know that they will always have each other's backs. He helps her out when her missions don't go the way they planned, which doesn't happen too often. She teaches him how to be a good spy, although that isn't the intention when they start the lessons. And they become very close, just as close as true siblings, in fact. So when Natasha finds herself in a complicated position during the Avengers' Civil War, Percy decides to interfere. And the Avengers are extremely surprised when they meet Natasha's younger brother. Plans are made and set in motion, alliances are completely misconstrued, friendships are tested and broken, and the two siblings find themselves on their own side against the world. However, there's something bigger in the works for the Avengers, and they'll need all the help they can get to face it. Including the two green-eyed siblings in everything but blood. This is largely Marvel canon compliant up until Captain America: Civil War, with Percy's interaction with Natasha being a background to the PJO books. Cover by @cajoling - she's awesome, honestly I'd check out her work as well lol

It's Drarry. Need I say more?

Harry Potter stolen away from his relatives house, and Draco Malfoy the only witness. There would be some explaining to do, if Severus managed to save the brat in time.

If Severus could just keep Harry from dying in the night, then maybe they could both experience a life better than the one they had lived so far. Sequel to The Art of Forgetting. Springfest 2016

A truly horrible thought occurred to Severus, if Petunia had failed to give her nephew the most basic necessities, what else had she withheld? Springfest 2016.

Six year old Harry Potter was running away. And this time, no body was going to stop him... Severitus/ AU. Childfic, fluff. Disclaimer: I don't own the world of Harry Potter.

Every year it was the same, Severus Snape cleared his face of all emotion, apparated to Privet Drive and visited a little boy whose only desire in the entire world was to have someone that would love him. Potions and Snitches Halloween fest 2014 Winner

When Severus Snape first sees Harry Potter, he believes him to be a "Perfect Little Daddy's Boy," [despite Harry never meeting his father before], with a perfect life. When an accident occurs in the first potions class, Snape is shown how wrong he was. ❁ WARNING FOR IMPLIED ABUSE

Dumbledore, Trusted mentor. Wrong Dumbledore senile old man is more like it. After finding out that Dumbledore and his friends are keeping secrets from him he goes home to 4 Privet drive. There Harry Potter goes through a creature inheritance and finds out that he isn't Harry Potter at all but Hadrian Riddle, the stolen son of Tom Riddle. He finds out that his mate is none other than Draco Malfoy.

This is a father son relationship between Severus Snape and Harry Potter. This takes place in first year.