Author's Note:

So, I see you have decided to read McGee's Surprise. This is the very first story I have written using NCIS and I haven't watched too many of the episodes. I know this story happens after Kate and Jenny died but, as I have no clue how old McGee is, I'm going to say he's twenty-eight. It's AU of both NCIS and Harry Potter and I really hope you like it! Also, I might switch over to first person after this chapter. I find that I can slip into a character's mind set a lot easier if I pretend to be them. Third person just seemed to work better this time than first.

Chapter One: The Letter

Special Agent Timothy McGee hadn't been expecting anything unusual today. He had expected the normal head slap Gibbs gave to Tony after a smart aleck comment. He had expected Ziva to threaten to kill Tony with a paper clip. Hell, he had even expected Abby to come flying from the elevator to tackle him after she learned that he taken a small fall last night that resulted in a surprisingly large cut on his forehead.

The last thing he had expected was a letter from his ex-girlfriend's sister.

When he had arrived at his apartment and found the letter in Jethro's mouth he had thought it had been another letter from his publisher to get his ass moving on his next book. He had half-heartedly fought with the German Shepard to hand over the letter before the dog, surprisingly, put it on the coffee table and went to take a nap on the couch. Tim tiredly ran his hand through his hair and picked up the drool-covered letter. Dear God, he prayed, this better be nothing important!

His heart practically stopped when he saw the return address. Petunia Dursley nee Evans, sister of a summer fling he had that happened in England a little over four years ago. That summer, and until the beginning of December, had been the best time of his life. He gave a small smile when he remembered Lily, the nineteen, almost twenty, year old that had stolen his heart a few months before his twenty third birthday. They had spent nearly every day together. Tim remembered taking her to fairs and carnivals. He remembered the one night they went all the way, sometime in the last week of November. He remembered breaking down to her a few weeks before that night, telling her that he was an American wizard. He remembered her laughing and telling him that it was alright, that she was a witch. Then came the night that Lily told Tim that she was married, that she had to stop seeing him before her husband found out about the affair, and, even if she did divorce her husband, she couldn't live with herself if she put him in danger of being killed by You-Know-Who because she was with him. He had let her go peacefully, but deep inside he had been absolutely devastated.

Had something happened to Lily? If something had happened, why was Petunia writing him instead of Lily? Was Lily hurt or, Merlin forbid, dead?

Tim opened the letter hurriedly and his heart dropped, than it rose a little, then the shock, and finally an anger he hadn't felt since he was eighteen and learned that his sister's boyfriend had punched her after she refused to go on a date with him since he was drunk. Merlin, why hadn't Lily told him! He would have handled it like a grown adult! He looked at the letter again and had to hold back the bile that was starting to rise in his throat.

Dear Timothy,

This is your problem McGee, not mine! It's not my fault my freak of a sister got herself killed by that madman, Voldemort, along with her husband! I don't need to put my family's life in danger just because my sister and her good for nothing husband died! That old coot didn't even leave me with a choice all those years ago! Expected me to just take the tot and love it like my own! Well, I've got another thing coming for him! I've spent two years raising that ungrateful brat and I refuse to spend another year doing so!

I know you slept with Lily that November. She came crying to me a few months afterwards, saying she was pregnant and didn't know who the father was. Well, too bad for her! I'm going to be blunt McGee, I think Lily's baby is yours and I want you to do one of those D.N.A. test things. If the baby is yours, I'm signing custody over to you, if he's not yours I'm leaving him in some orphanage in America.

I refuse to keep a dirty little freak in my house! I won't let him contaminate my sweet little Dudders with his freakishness! I'll arrive in America on December 6th, that'll give you enough time to prepare for a child. I have no doubt he's yours, looks just like you, at least he looks like you did in that picture Lily had. Here's to you not getting blown up like my idiot sister.

Sincerely,

Petunia Dursley nee Evans

Tim collapsed into a heap on the floor. Lily and her husband were dead, killed by the man that he and the other kids at Salem Academy had only heard rumors about. Voldemort, he didn't even know half of the things the monster had done and the name still made him shiver with fright, had killed the woman he had loved and the man she had married, leaving their son orphaned. But that might not even be true; he might be the little guy's father! He needed help and he needed it quick. He'd have to call Abby and see if she could do the D.N.A. test for him. But first, he needed to talk to his boss.

He carefully picked himself off the floor, trying his hardest not the fall back down from the shock of it all. Jethro watched him with rapt attention, waiting to see if his master would fall back down and if he needed his help. Tim gave a smile at the dog as he sat next to him, feeling comforted when the dog rested his head in his lap. He gave a worried frown as he stared at his, very reluctantly at first, loyal friend. Would Jethro try to attack the little boy if he did turn out to be his son? Would he be forced to give up his furry companion in order to keep his own flesh and blood? Tim knew what he'd do if it came down to it. It didn't make it any easier imagining his life without his dog.

Tim reached into the envelope and plucked out the remaining items. One was the little boy's birth certificate, which recorded his name as Harry James Potter, born the 31st of July as of three years ago. It was a possibility that he could be the child's father. The two other sheets were photos. One was of him and Lily at the beach one afternoon, watching the sunset. The other was of a small, dark haired child. He assumed it was Harry and he could see what Petunia was talking about. The child's eyes were shaped like his mother's, but appeared to be a mixed of his grass green and her emerald eyes. They appeared to have the same nose and, if he was looking correctly, the little boy was a southpaw too. The boy's hair was only a few shades darker than his and he looked fairly small for his age, Tim knew he had been a runt until he turned fifteen, and then he had sprung up a little. Maybe Harry would be like that too.

He gently put the pictures on the coffee table and pick up his cell phone before looking at the time. 2300, his boss should still be awake; he normally stayed up till 0100 working on his boat. He sighed and dialed the number, feeling slightly apprehensive.

"Gibbs."

"Boss, I need your help."

There was silence on the other end of the line and Tim was afraid that his boss had hung up on him. It wasn't any surprise that Tim rarely came to Gibbs for help, he wasn't exactly sure if he deserved it after growing up with his father, but he really didn't know what to do now. A child's whole life could become dependent on him and he had no clue how to be a parent! "What's the problem McGee?"

"Long story short, I met a girl a few years back, we had a little fling, told me she was married a week after we went all the way, and I just found out that she was pregnant and murdered about a year after she had the baby. And it might be mine…"

"… I was expecting to get this kind of call from DiNozzo, not you McGee."

"I know Boss."

"How long ago was this?"

"What, the fling? That happened a little over four years ago. Lily and her husband were murdered around three years ago. The baby, I think his name is Harry, should be around three years old now."

"How exactly is this playing out McGee?"

"Petunia, Lily's sister, is coming to America on the sixth. She wants me to get a D.N.A. test done and, if Harry is mine, she's signing over custody to me. If not, she said that she was going to drop him off at an orphanage here. She didn't say which one though."

"She say anything else?"

"Things that I shouldn't repeat because they make me want to puke."

There was a moment of silence. "… Mind if I ask a question?"

"Go ahead Boss."

"Does this Lily person have anything to do with the part of your file that is missing? I know you said the fling was four years ago, but we can't find anything on you after you turned eleven until you turned sixteen. Director Vance is getting a little antsy about it."

McGee could hear the silent 'and I am too' at the end. "Yeah, in a way, she does."

"Are you going to explain it to me tomorrow?"

"I've got one phone call to make before then. As soon as I get the all clear I promise I'll tell you everything."

"I'm holding you to that McGee." The line went dead.

Tim sighed and dropped his head into his hands. It was bad enough that he had to tell his boss about, possibly, being a father, now he had to reveal a secret his family had been keeping since the Revolutionary War. He knew he would have to answer about the missing years in his file eventually, but he had been hoping that he still had time. Dear Merlin he was royally screwed!

A quick glance at his clock showed that the time was inching closer to 2330 now. The Mage-in-Chief Vincent Smith, also Tim's best friend growing up, was currently in California on business. In California, the time should be around 2030, enough time for Tim to explain his dilemma to his old friend if he wasn't too busy.

Tim removed Jethro from his lap before rushing to his room to find the old two-way mirror he and Vince had used in Salem. He smiled when his hand connected with the hilt of the mirror. Vince and him had used these mirrors to coordinate a lot of small pranks and secret meetings growing up, something neither of them had fully grown out of. "Wisdom and Courage make a mighty team." Tim whispered to the mirror before the glass began to ripple.

A few moments passed before the familiar face of Vincent appeared on the surface. Vince was older than Tim by only three months, but often looked older than he was because his once silvery blonde hair was streaked with a dark gray. Vince's brown eyes looked weary and worn, but instantly brightened once they met Tim's. "Timmy, old pal! I hadn't been expecting a call from you for a few more weeks!" Vince exclaimed. Then he noticed the worried look in Tim's eyes. "Okay McGee, what kind of trouble did you get into this time?"

Tim gave a weak chuckle before rubbing the back of his neck. "You remember that summer I spent in Europe after I got transferred out of Norfolk but before I joined NCIS?" he asked, feeling like a child caught stealing a cookie from the cookie jar.

"Yeah, that was the summer you told me you'd only be there until August and you ended up staying until early December. What about it?"

"Well there was this girl…"

"And…?"

"We hit off pretty well and were together for a few months…"

"Then what happened?"

"She told me she was married."

"Ouch."

"Yeah, then I got a letter from her sister earlier tonight."

"Why would her sister want to talk to you?"

"Lily and her husband were killed a few years back."

"… Holy shit…"

"Turns out Lily's only son survived… and the kid might be mine."

There was a long moment of silence before Vincent burst into laughter. "Only you McGee! This would only happen to you!"

Tim rolled his eyes at his friend. In all retrospect, he could safely say that this would only happen to him. "That's not even the best part Vince."

"How could this get any more complicated?"

"My boss wants to know why he can't find any records on me from when I turned eleven till I turned sixteen."

"…Timmy, I swear you have the worst luck out of anybody I know."

"What am I supposed to do Vince? Gibbs is a muggle, and if I tell him, I'm going to have to tell everyone on my team!"

"Then go ahead and tell them!"

"…What?"

Tim was completely shocked. Vince was going to let him tell the team? Wasn't that against the Statue of Secrecy?

"They deserve to know Tim." Vince said his voice suddenly soft, "I'd rather a few muggles know then lose a good man and agent because he was too afraid to use something that could save his life, along with his fellow agent's lives."

"Thanks Vince."

"Anytime. Oh, before I forget, I have a question for you."

"And that would be?"

"If this kid is yours, can I be the godfather?"

Tim gave a small chuckle. "Who else would I ask? That snotty British exchange student we got in fifth year? What was his name again?"

"Malfoy, Lucius Malfoy was his name. So, I'm taking that as a yes?"

"Of course you are, stupid."

Tim watched as the president of the Wizarding half of the United States did a small victory dance. Vincent Smith might have been a man that had a lot of power, but he was still a child at heart. Tim always savored the moments that he could make his best friend happy. This chat alone was making him feel less nervous about his possible entry to parenthood.

"Hey Tim!

Tim turned his attention back to the mirror.

"I'll be at NCIS tomorrow. Maybe I can help your team get an affinity for magic."

"Thank Vince. You have no idea how much this means to me."

"Anything for an old friend."

With that, Vince faded from view. He shook his head at his friend's plan and hoped to Merlin and God that his team took it well. With that, McGee crawled into bed, dreaming the moment his head hit the pillow.

The whole night was filled of a dark haired boy playing with a sandy haired man, both being watched by graying grandfather in the background.