Knowing everything he did now, Gon looked at his friends, wondering how he got to so lucky. Yeah, it's been 3 years and Killua and him were 15, while Leorio was 22 and Kurapika 20, but none of them forgot each other. Kurapika finally avenged his clan, and killed off all the members of the Phantom Troupe and collected the eyes of his fallen clan. Leorio became a doctor and helped people, all with no charge. Gon found his father, and told him everything about his friends and taking the Hunter Exam along with traveling with Killua.
"So," Gon started, looking around the train cart. "What do you guys want to do?''
Killua had started traveling with his younger sibling Alluka, and after a while, sent the sibling back home and went to find Gon. Then he took the Hunter Exam again and became a Hunter. But Gon, Leorio and Kurapika realized something, the day the three went to pick Killua up from the train station in Kukuroo Mountain, he seemed different. He lacked something that he once had when they first met him.
"Nothing." Killua snapped, looking out the window.
"Oh come ON!" Gon groaned, laying back on the soft couch. "Why not?! It's so boring in here!"
"Gon, no one wants to do anything. Especially with you!" He yelled, facing at his friend.
"But-"
"But nothing! If you wanna do something, go do it yourself!"
Gon didn't say anything after that. 'What's wrong with him? He's been like this for days.' Kurapika thought, looking at the white haired boy, then looking back down at his book.
"Hey, do you guys wanna get some food?'' Leorio asked, getting up.
Leorio joined Gon and Kurapika after he finished medical school, so now he travels around and helps anyone who needs it, along with maintaining his friendship with Kurapika, Gon and Killua.
"Sure." Gon smiled, looking at the man from his spot from the couch.
He then got up and looked at Killua and Kurapika.
"I'll come too." Kurapika smiled, putting his book on the coffee table.
"What about you Killua?'' Leorio asked, looking at the ex-assassin.
"No thanks." The white haired boy snapped, not even facing them.
"Ok, we'll bring you something back then." Gon smiled, opening the door to the cart.
Then Kurapika and Leorio followed, leaving the ex-assassin alone in the cart. Killua sighed and walked to the room him and Gon shared, then opened his bag. He took out a picture of him, Milluki and Illumi with their mother. He was about 3, Milluki was 10 and Illumi was 15, Kalluto and Alluka weren't in the picture because when they were young, their father didn't want pictures of the two being taken. Killua looked at Illumi and sighed.
"There was a time we got along," He muttered. "You messed it up."
He sniffled, and sat on the bed, letting tears slide down his cheeks. He quickly wiped them away with his sleeve and thought back to that day, the day when Illumi brought him to the Heaven's Fighting Arena. Ever since that day, he held a strong hatred for his 27 year old brother, he hated all of his family except his younger sibling Alluka.
Flashback;
"Ok Kil, you're going to be staying here for a while." Illumi sighed, sitting a 6 year old Killua on the ground.
"Why Umi?'' The young Killua asked.
"Father said for you to finish your training here." He explained, ruffling his brothers messy white hair.
"B-But, I-I don't wanna be here!" Killua started crying, and he looked at his brother with tears in his dark blue eyes.
"I'm sorry Kil, but you don't have a choice." Illumi sighed, bent down next to his brother. "I'll be back."
"R-really?'' Killua asked, wiping the tears away with his sleeve.
"Yeah, I'll come visit you everyday and watch all of your matches, so you better not let me down." Illumi smiled slightly.
"Promise?'' He asked, holding out his small pinkie.
"I promise." His brother smiled, and held out his big pinkie.
They then pinkie promised, and Illumi hugged Killua, then left. Killua watched as his older brother walked away, he brushed a few tears off his face and walked into the arena. The next day, he started fighting, and looked in the crowd to find his brother but sadly, never saw him. He won his first fight, and looked for Illumi but still no luck. The same thing went on for days, eventually weeks then months. Finally, Killua stopped looking and started focusing on his fights.
5 Years Later;
Killua skated to his mansion on his skate board, passing trees and Mike on the way there. Once he got inside, he was greeted by his younger sibling Alluka.
"Killua!" Alluka greeted, hugging him. "It's been forever since I've seen you!"
Killua smiled, and hugged back.
"Dido." Killua laughed.
Then they let go and parted, Killua started skating down the hallways of the big mansion, and once he got tired of skating, he started walking. On his way to his old room, he passed a face that he knew. Illumi. His older brother looked at him, and he looked back, finally, Killua looked away and walked to his room, leaving his older brother.
"He broke his promise." Killua whispered, locking his bedroom door. "And I'll never forget it."
End of flashback;
Eventually, one thing lead to the next, Illumi and Killua re-united at last years Hunters Exam. Illumi tricked Killua, and he went home without a license. Illumi tricked him, broke him and violated him all at the same time, and with the same, boring, emotionless face. Truth be told, he was never like that.
"You broke your promise." Killua muttered, putting the picture back into his bag.
That's how his strong hatred started for his oldest brother, Milluki was a whole different story. That fat bastard always hated Killua, all because he was the next heir and mother like him more. Then the hatred for his younger brother, Kalluto, was because he was apart of the Phantom Troupe, yeah he stopped Kurapika from killing his younger brother, but he still hated him. But hating Illumi was a different thing, he broke Killua. And not to mention, a promise. Recently, after dropping Alluka off at home, he had a run in with his older brother, and they had no interaction what-so-ever, all they did was stare at each other.
"KILLUA!" Someone yelled from outside the room.
Killua quickly put his bag down walked out, seeing Gon, Leorio and Kurapika looking concerned.
"Could you not scream like that?" Killua snapped, sitting on the soft couch.
"Sorry," Gon handed him his food, which was in a container. "I just guessed."
"Well I'm not really hungry." He replied, sitting the container on the table in front of him. "But thanks anyway."
"Ok, I am sick and tired of this bullshit!" Leorio snapped. "What is your problem? You've been acting like a spoiled brat ever since we picked you up last week!''
"I'm acting like a spoiled brat huh?!" Killua got up and started yelling too. "EVERYTHING IS MY FUCKING PROBLEM!"
"WELL YOU BETTER START SHAPING UP OR ELSE WE'RE TAKING YOU BACK TO KUKUROO MOUNTAIN!" He yelled back, getting into the ex-assassins face.
"NO YOUR NOT! THERE IS NO WAY I AM GOING BACK TO THAT HELL HOLE AND HAVING TO SEE HIM!" He screamed, making the whole cart shake.
Leorio didn't yell back.
"Killua, what's going on?'' Kurapika asked, walking slowly to the un-approachable white haired boy.
He didn't answer, he just looked down and made his hair cover his eyes.
"You can tell us." Gon smiled, walking to his friend.
Then he put his head under Killua's head, so he could see the boy's face.
"Hi." He smirked and wiggled his eyebrows.
"No, just leave me alone." Killua snapped.
"Killua." Kurapika snapped.
"No." He replied, raising his voice. "You wouldn't understand."
Then he pushed Gon away gently, leaving the dark haired boy with a confused face.
"What's not to understand?'' He asked, looking at his best friend.
"All of it," Killua snapped. "Now leave me alone."
"No way! I am not going to let a friend of mine keep being an ass! Tell us or else I'm taking all of your money to you can't buy candy." Kurapika replied, crossing his arms.
"Hell no! You can't do that!" He yelled, facing the blonde.
"I can do whatever I want."
Killua's glared at the adult, and then sighed.
''I'm mad at my brother." He sighed, sitting down.
"Milluki?'' Leorio guessed.
Killua shoot his head.
"Alluka?'' Kurapika guessed.
"Alluka has an unknown gender, so don't bring the child into this." Killua snapped.
"Kalluto?" Gon asked. "I mean, he's a little cutie!"
"What's so cute about a little boy being apart of the now extinct Phantom Troupe?'' Kurapika asked, glaring at the boy.
"I dunno." He shrugged. "He just is."
"No." Killua shook his head. "Not him."
"Then who?! Do you guys have some unknown sibling that I should know about? I mean if we're going to get married, I wanna know who's in my partners family!" Gon replied.
"Eh?!" He asked, looking at his friend.
"Nothing!" The dark haired boy lied. "It was nothing."
"Mk." Leorio eyed Gon suspiciously. "Who is it Killua?"
"It's Illumi." Killua sighed.
"We know you hate him, and we can understand why." Kurapika laughed nervously, sitting next to the ex-assassin.
"It's not just about what happened during last years Hunter Exam, or when he tried to stop Alluka from healing Gon, it's something way different." He explained, looking at the blonde.
"Then what is it?'' Leorio asked, sitting across from him on the other couch.
"You're seriously going to find this hard to believe, but me and Illumi actually used to get along just fine." He shrugged. "I just don't know what hurts more, the fact that he broke our promise or that he never apologized for it."
"Promise?'' Gon asked, jumping on the couch Leorio was on. "What promise? Was it a pinkie promise?"
"When I went to the Heaven's Arena my first time, he brought me there. He told me it was only for a little while and promised he'd come back and watch my matches. But the next day I tried looking for him, and he never came. Same as the next day and the next, eventually I stopped looking for him." He sighed, looking out the window. "Honestly, I just think he never really cared for me."
"That's..." Kurapika trailed off.
"Sad!" Gon cried, going to hug Killua. "Why don't you share your life with me dear best friend?''
"Because you do stuff like this!" Killua screamed, letting Gon hug him tightly.
"You're sad, so I must hug you!" He replied, hugging the ex-assassin tighter.
"Let go!" He yelped.
"Never!" Gon cheered. "I am going to make sure you and your brother get along again!"
"But he tried to kill you!" Leorio yelled, looking at Gon.
"And? I want my future partner to be happy, and for us to be able to spend christmas over there." He smiled.
"What?!" Killua asked, blushing.
"Nothing!" Gon yelled. "I'm going to make you and your brother love each other again!"
Then he let Killua go and ran out of the train cart.
"He's going to get himself killed." Leorio sighed. "And Illumi isn't going to be the one to do it."
Kurapika looked over at Killua, the boy was trying hard not to go after Gon.
"Go to him." Kurapika nodded.
The ex-assassin nodded and went after his idiot friend.