My Brother's Best Friend (Luke Hemmings/5SOS Fanfic)

Chapter 1

"ADDIE! I'M HOME"The firmiliar voice of my brother called from downstairs, I screamed a highpitch scream and ran down the stairs, nearly falling as I did. 
"ASHTON!"I yelled as I tackled him in a hug. His kinda highpitched laugh eachoed in my ears, as he hugged me back. "I missed my older brother, got a problem?"I asked, letting him free of the hug, and leaning against the table beside me. 
"Why would I have a problem with you missing me? I missed you too, Adds"He said, ruffling my hair. I screamed and hit him, my face probably looking weird as I did so. He laughed at my wimpyness.  
"Love you too, Ashton"I replied, bluntly to his laugh, as he walked to the door, opening it to reveal two boys that I did like, and one not so much. "CALCAL! MIKEY!"I shouted, jumping on them, they caught me before they could fall. 
"ADDIE!"Calum yelled back, laughing at me. "Cute, Adds."I stuck my tongue out at him, laughed, as they put me down. 
"Luke"I said, bluntly, nearly glaring at him. 
"Addison"He said, using my full name. 
"It's Addie, I don't like Addison, please."I groaned, walking back inside and going to the kitchen to find some food to eat. 
"And I like Addison better than Addie, because you get mad"He said, with a smirk lingering on his lips. 
"Fuck you"
"ADDIE! You've never talked like that!"Mikey cooed, I rolled my eyes, not a bit angery. 
"I'm going to my room, see ya"I said, kissing Mikey, Cal and Ashton's cheeks and running to my room, not expecting anyone to follow me. I opened the door, closing it behind me, ploping on my bed, sighing, but smiling. My brother came home, I missed him so much. Oh yeah, I didn't go with him because I didn't want the fame, so I am the unknown sister. Lauren and Harry are well known to the 5SOS FAMILY,me however, not one bit. I do appear in the background a few times, only because I was outside when they were recording by the window. I do somewhat look like Ashton, same color hair, my eyes are the same color, but I am a girl and my hair is stick staight all the time. Hearing my door creak, slightky, I threw a pillow at who opened it.
"Shit"Luke yelled. 
"What do you want?"I groaned in frustration.
"Ashton sent me, food"He said, as soon as he had said foo, I was out the door and running downstairs. 
"FOOOOOOOOOOOOOOOOOOOOOOOOD!"I yelled through the house, Ashton laughing at me and my excitement for food. "EVEN BETTER PIZZZAAAAAAAA!"I yelled, grabbing the box, Ashton was handing me and eating it. 
"Ashton, what is wrong with your sister?"Calum asked, watching me as I ate. 
"Everything, but I'm related to him, so yeah"I laughed, as Ashton looked at me. 
"Hey! Love you too sissy"He called me 'sissy'
"Dear lordy. I hate you, Ashy"I replied, smirking a tad, then carrying on to eat my pizza. Finishing the whole eight peices. 
"HOLY FUCK! SHE ATE MORE THAN I DID! BEFORE ME!"Michael shouted, I laughed. 
"I'm just that awesome, and I get really hungry, and yet I don't gain weight"I laughed, walking back to my room. I noticed someone following me close behind. 
"PIKACHU!"I yelled, making them fall over, as I turned around I saw Luke, I rolled my eyes, closing and locking my door. 

LUKE'S POV

Damn her. I have to fgure that one out. I was about to knock on her door, when my phone rang. 
"Hello?"
"Hi Luke"
"Hey Henry"I smiled, my manager, not good.
"So, I need to talk to you. The other boys have been getting more popular than you, we have a plan. You are getting a girlfriend, real or fake, it doesn't matter. You get to choose her." Oh this is gonna be good. 
"Hold on Henry."I said, walking out of the house, "Ok, I already have one in mind. Addison Irwin"I said into the phone, as clearly as possible. 
"Irwin? We didn't know Ashton had another sister."
"No one does, yet."I smirked, looking back at the house, seeing Addie dancing in her room, singing to whatever she had playing, I laughed. 
"Ok, we'll see. If she doesn't work out, try to find one, OK? Bye, Luke"Henry said hanging up. I smirked going into the house, sitting next to Ashton. 
"Hey, what was that about?"
"Henry wants me to find a girlfriend,  real or fake. I chose fake, and I was able to pick."I stated, shrugging. 
"Who did you chose?"Ashton saounded worried. 
"Your sister"I said simply. 
"WHY!"He yelled.
"SHHH! We can't have her knowing. It's not real, calm down Ash. I don't even like her that way."I said, chuckling.