Chapter 1

"Two most powerful wizards dueled" read the newspaper headline. Daily Prophet, a wizarding newspaper, just published a new story in their paper. "Yesterday, two greatest wizards fought and the Dark Lord has finally killed of Professor Dumbledore, who…" the article continued although the man who was reading the paper put it on the floor and closed his eyes. Many things occurred recently in his life, some of which he wished he could have changed.

Severus Snape still remembered his love, Lily Evans, and how he told her a rude remark, which destroyed their friendship. Snape also hated the fact that Lily married that bully Potter, as he liked to think of him. He took another glass of Firewhiskey and continued thinking.

As Severus Snape was thinking, he received a knock on his door. The man stood up and went to check who that was. After he opened the door, he saw Professor McGonagall standing at the doorstep.

"Hello Professor, how may I help you?" asked Snape

"Severus, I brought terrible news. After Headmaster's death, You Know Who got reckless and went after Potters. James and Lily are dead and the Dark Lord has disappeared, many claim he is dead. However, Potter's son survived. This is still fresh news and the story did not reach the newspapers yet."

"And why did you come to me?" asked Severus with a questioning look

"I found out a letter in Potter's house written by Lily, which was addressed to you"

Snape took the letter and opened it. He instantly recognized the writing of his precious Lily and started reading.

"Sev, if you ever receive this letter, that means I died. First, I would like to tell you that I forgave you for calling me that word. I know you have some good left in you. I am sorry how all ended up but I love James a lot. Sev, please take care of my baby and raise him to the best of your abilities." After that Snape looked at the Professor and only now noticed a small baby, which was sleeping in her arms.

"This is young Potter?"

"Yes, his name is Harry James Potter. Will you take him as Lily asked?"

Snape thought about the situation. On one hand, he hated Potter's guts for everything he did to him and on the other he wanted to fulfill Lily's last request. Snape hesitated and looked at Harry. The child was sleeping peacefully and the young man saw the boy's eyes. He looked at them and saw Lily's green eyes.

"I will take care of him Minerva. Is there anything else you need to tell me?"

"Yes, there is one more thing. Lily requested that you move to Potter's mansion and train young Harry there as your apprentice. I agree with Lily on that as the Death Eaters may soon overtake the Ministry and Harry could be in danger."

Snape hesitated as he did not want to move in to the house of his enemy but eventually decided that he will as he remembered the promise he made to Lily to look over her son. Professor McGonagall gave him the key to Potter Vaults and then apparated away.

Snape looked at the baby he held in his hands. He saw that Harry in his sleep yawned and then tried to hug his neck. Snape carried the infant to the bedroom and put him in the bed. The young Death Eater had confusing thoughts.

"I cannot believe they took you from me, Lily. I begged Voldemort to spare you but he did not." Then, he realized what he would do. "I would avenge you Lily, I will kill any Death Eater who will try to harm your son." With those thoughts, he breathed easier. He knew that someday he will start punishing Death Eaters for their crimes but as of know, he needed to take care of the infant, which peacefully slept in his bed.

A/N: this is not really a crossover but basically Snape will become Batman like figure and Harry - Robin. I was thinking of bringing Hermione here as well as third member of this vigelante group, but she would appear later.

Who would you want to be Snape's primary archenemy be?