(Chapter 2 is now up and running)

Explanations:

McGee had regained his full strength after an hour since his brother's visit, Sarah had insisted on staying at Ncis, Gibbs, Tony and Ziva were waiting for an explanation for McGee's brother existence since it was not in his file, they all knew that McGee had a strained relation to his father while he hardly spoke about his family.

Ziva was positively more curious about everything but mainly she was worried about McGee's reaction to his brother's presence, director Vance had contacted the team and told them to form up in the conference room with McGee's sister, McGee knew what was coming and was ready for the questions… although it was going to be one hell of a long story.

"Special Agent McGee" Director Vance greeted pointing to the chair at the end of the desk next to where Sarah was sitting.

"I take it you all want to know" McGee said knowingly.

They all nodded in reply while McGee took a deep breath.

Sarah could tell he was nervous as hell so she decided to start him off "It all began when our mother was pregnant with Timothy…" their parents explained the story to her after their first encounter with Davis "Before Timothy began to develop into physical form, his genetic DNA make up began to break apart, The doctors had watched closely as soon there were 2 embryos inside our mother" Tony scratched his head "Twins?" McGee shook his head "No… where both the same guy but one of us is a genetic defect" his voice low.

"Why did McGee get sick around Davis" Ziva asked concerned.

"I don't know… When were kids whenever we got too close I would fall into a coma. The scar is a sign that tells us apart, he was born with it" McGee gulped "His brain is also… scarred, he's dangerous" he closed his eyes still feeling the effects of what happened the last time.

"McGee" Gibbs said curiously as he watched the young agent.

"Hmm" he looked at them all and sighed sadly before standing and heading to the door "Permission to take the rest of the day off?" he whispered "I need to time" Director Vance nodded in reply "Take the day off" Sarah got up but he stopped her "go to our parents place… you'll be safe" he told her before leaving them all behind.

Ziva and Tony sat at their desks thinking about McGee's situation, Abby had found out from them when she had gotten back from her conference on forensic evidence and she was feeling worried about McGee.

Ducky had heard the news too and did some research on the genetic split that caused this but could find no explanation on it so far, McGee drove home then went for a walk around the streets as the rain pounded him hard as the thunder became louder ringing in his ears.

His mind went back over the days that past throughout his life, the thing that hit him the most was Kate's death and more importantly Ziva David, his feelings for her was growing non-stop.

He prided himself on not sharing his personal life with anyone, he preferred to keep secrets for the protection of the ones he loves, and this secret was no different to him except he couldn't deal with it on his own this time unlike the last time, this time he had something to lose as well as something to fight for… Gibbs, Tony, Abby, Ducky, Palmer but mainly Ziva was the one he was willing to fight for.

Davis was standing on a nearby corner watching McGee with a wide grin "Oh brother… this time, it'll be your end" he said to the wind.

(Chapter 3: Sudden Change- coming soon)

Lycanboy666