Harry knocked on Dumbledore's office door.
"Sir? Professor Dumbledore, we need to talk, it's Harry," he said the calmest he could manage.
"Come in Harry," Dumbledore replied.
Harry entered the office. It had paintings of old headmasters on every wall, silver instruments everywhere, and Fawkes sitting on a perch by Dumbledore's desk. Dumbledore was sitting behind desk petting Fawkes.
"Sit down Harry," Dumbledore said as he gestured to a chair sitting across from him. Harry sat down while trying not to yell about his discovery.
"Harry, aren't you supposed to be getting lessons from Professor Snape right now?"
"Well you see, sir, I was."
"Why have you come then?"
"Well, I was getting lessons with Snape when Malfoy came in looking for Snape. Snape had to leave and he told me to wait in his office for him to return."
"Then why aren't you there right now Harry?"
Harry was trying not to cry from anger and confusion.
"Sir, I was looking at all of the interesting artifacts in Snape's office, when I came across a small jar that had my name on it. I recognized the substance inside to be a memory."
Dumbledore's calm facial expression switched to deep interest and understanding.
"I assume, sir, that you know what I come across?" Harry asked Dumbledore.
"I do Harry."
"Why have I never know of this until now?!" Harry could no longer hold in his anger. "Why does Snape not know?! Why have you kept this from me?! Why is it, Snape?!"
Harry was now standing but was interrupted by a large crash. He instantly turned around quickly.
Snape was standing there holding the door wide open. His face looked as if he ran a mile and was quite panicked.
"Dumbledore! We need to speak now! It's Urgent!" Snape's eyes panned over to Harry then he quickly let go of the door and stood more properly. Snape did not expect to see Harry there.
"Ah, Severus. I'm guessing you now know. Please, have a seat."
Snape walked over to the chair next to Harry and carefully made sure he didn't look at Harry. He sat awkwardly, almost like he was trying to sit far away from him.
"I'm sure both of you want to know what is going on."
Snape and Harry didn't say a word.
"As you know, about sixteen years ago Lily invited Severus over to her and James's house. They wanted a child but could not do so. Their solution was to get Severus to give his seed to Lily, and of course, as you saw, James didn't think a mask was enough to keep Severus away, so he obliviated him."
"Why did you never tell me?!" Harry jumped. He had never heard Snape yell before.
"Severus, I couldn't just tell you that you are a father when you wake up from being obliviated!"
"But sir! You could have shown me the memory!"
"I didn't want to get involved in your personal life! So, instead, I put the memory in your office! It's your fault, Severus, that you never looked at that memory until now, after Harry saw it."
"But why Potter?"
"We both know why Severus."
"No, we don't!"
"Wait! Are you telling me that greasy git is my father?!" Harry finally interrupted and was once again, standing.
"Harry!" Dumbledore said.
"No! I refuse to believe this! There is no way, we don't even look alike!"
"I agree! How could I be the father of Potter? We don't look alike!" Snape said.
"I thought we should talk about that. Harry, please take a seat."
Harry forgot he was standing and sat down.
"Lily and James used a masking charm on Harry once he was born to make him look like James. You see, mask charms don't last long, and somehow James and Lily were able to make a powerful mask charm that was five hundred times stronger than the average one. The masking charm took away Severus's physical features and replaced them with James's. There is only one problem, the mask only lasts around fifteen and a half years, so that means it's started wearing off recently. I think you and Harry should put your differences behind you because soon everyone will know."
"Why can't we just reapply the charm?" said Harry. He was quite worried that he would also look like a greasy-haired git with a hooked nose.
"We can't, Harry. Since James isn't alive we can't use his DNA to reapply the mask."
"Great, that Potter boy is going to look like me?" Snape asked.
"I'm afraid so, Severus, he is your son."
Snape looked at Harry for the first time since they found out the truth. He stared at him with a puzzled expression. He studied Harry's face for a few seconds and then looked at his hair, then turned back to Dumbledore.
"He hasn't changed yet, sir. He still looks exactly like James."
"That's good. We should watch Harry's appearance closely to make sure he doesn't change quickly."
"Wait." Harry began. "Why did Snape even agree to this? How did he know my mother?"
"Your mother and I were childhood friends... that's all you need to know." Snape said in a very monotone voice.
"Okay, but why did you so clearly hate my father?"
"It doesn't matter Potter!" Snape snapped.
"Okay, I was just wondering!"
"Harry, you should be off now, but you must remember something very important," Dumbledore said.
"What is it?"
"You must not tell anyone! Even Ron and Hermionie."
"But why?"
"In case you forgot Potter, I'm still spying for Dumbledore," Snape said coolly.
"Right, I guess I should go now."
Harry got up quickly and left, he decided to head for his dormitories to avoid Ron and Hermionie.