Your point of view~
Only one week before Killua's birthday. I had a great idea and i hope he'll like it.
"So when will you be leaving?" Gon asked.
"Tomorrow." I said.
"Awwww. I'm gonna miss the both of you. Does Killua know where you are taking him?"
"No, I don't want him to know." I replied.
"I'm sure he'll like your idea Y/n." Gon said.
"Hmm?" Killua asked when walking in the room. "What's going on?"
"Um..." I paused. "I want to take you somewhere special so we'll be leaving tomorrow." I smiled.
"Huh? Are you going to tell me where this place is?" He asked.
"N-No. It's a secret." I said.
"Huh?"
"Yeah, I will sadly not be joining you two love birds." Gon said.
"Now I'm even more confused." Killua said. "Are we going to see a movie or something?"
"I can't tell you. It's a secret."
"Why?" Killua started getting frustrated. I just started laughing.
"Killua, the other day when Kurapika and Y/n left, why didn't you even try spying on them?" Gon asked.
Killua's face turned red. "H-Huh? I-I...Didn't want too."
"But why?"
My face turned red as well. "No reason Gon." I said.
"Huh?" Gon said. "But, Killua is a protective boyfriend. Usually he'd go after you."
I remembered what I had whispered in his ear. "N-No reason, Gon."
Gon looked at us suspiciously. "Okay. Whatever you say."
"So, we leave to a place that I have no idea about tomorrow?" Killua asked.
I nodded. "I've already packed a few things." I said.
"Huh? We need to pack?" Killua asked.
"Huh? What do you mean? Of course. We'll be gone for quite a while." I said.
"I'll go to a place for over three years and be perfectly fine without packing." Killua said.
"Fine, do whatever you want but I've already packed a few things."
The next morning~
"When will you two be back?" Mito asked.
"In about a week or so. I promise we'll be safe." I smiled.
Mito smiled. "Right." She began to cry. Then she pulled me into a hug. "I'll miss you Y/n." She looks up at Killua. "You too. Take good care of each other." She let go of me.
"Don't worry. We will!" I said.
"I want a hug!" Gon shouted. He ran up to me and gave me a big hug. He started crying. "I'm going to be so lonely!"
"It's alright Gon, we'll be back soon." I smiled as I hugged him back.
Gon backed away and wiped his tears. "O-Okay." Then Gon ran up to Killua and gave him a big hug as well.
And so we were off to a New Journey. We got on the ship and I took off shortly afterwards.
"Where the hell are we going?" He asked.
"I still can't tell you." I said.
"Wwwwhhhhyyyyy?!" He let out a long sigh.
"Because it's a secret. We've been over this, silly." I smiled.
Killua's face turned red and he faced the other way. "Stop being cute." He murmured.
"Hmm? What was that?" I asked.
"Nothing." He said.
"Hey, it's just us. No Gon, Mito, Illumi, Hisoka or Kurapika or Leorio." I said. "Just the thought of us being the only two is kinda sad." I said.
That night~
I don't like sleeping on ships that are moving. So I sat in place and watched Killua sleep like and angel. His face looks so soft. I want to poke his pale face. I took my finger and put it up to Killua's lip when, Killua decided to lightly bite my finger. I instantly pulled my finger back. My face was red. Killua opened his eyes and started laughing.
"What were you trying to do?" He asked.
"H-Huh. I-I..." I paused.
"Hmm? What's that?" He asked.
"I j-just wanted to touch your adorable face." I said with a red face.
"Huh?" Killua paused and his face turned red too.
We looked away from each other. Then Killua looked back at me. "I want to t-touch your cute face too." He said. His face was still red. So, he picked up his hand and poked my cheek.
The next thing I notice is that the sun is coming up. And we are almost there. "Happy Birthday. Killua." I smiled.
"Huh?" He questioned.
The sun shines enough light for him to see the surprise. The Island that I first started out on.
I hope to see you soon too, mother.
To be continued...
Thanks for reading!!!!

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Gon's Sister? (Killua x Reader)
Fanfic[Completed] [Is currently being edited] (Please Note that you are 14 turning 15 in this story, you're not 12 like everyone thinks) (Sequel has been discontinued and unpublished) When Ging returned to the island, he never mention how many kids he had...