Yandere Killua X Fem reader

At the mall

     Later that day you found out you were both going out with Gon. All three of you were going to  the mall to do some shopping and hang out. You just finished getting ready coming out of the closet in your favorite outfit.
"I love that outfit on you." He said looking you up and down. You smiled and did a little spin.
"I knew you would." you said.
"Gon said he's way there so we should get going." He said grabbing your hand and leading you out of the room. You both made your way to the mall and waited to meet up with Gon at the food court. Killua was looking at his phone.
"Alright, he said he's here." Killua said looking up, trying to spot Gon through the crowd of people.
"There he is." You said in an exited voice, pointing at Gon.
"Ahh I see him." Killua said, but you didn't even listen you were already rushing towards Gon.
"Gon, i missed you so much." You said hugging him tightly.
Y/n! I missed you too, I haven't seen you in so long." He said hugging you back.
Suddenly you felt a strong aura behind you, and hands your waist. Someone pulled you away from Gon. You turned around to see killua, who was glaring at Gon.
"Killua, stop." You said pulling your hands off him and stepping towards Gon.
"So where do you wanna go first?" You asked as you started walking next to Gon, away from killua.

     You guys were having so much fun laughing and talking about stuff that's happened in the time you were with killua. Killua was walking behind you both and you could feel him glaring at the both of you intensely, but you didn't really care. You were having to much fun with Gon to even notice killua.

     You both went into a store killua wasn't interested in so he waited outside, keeping a close eye on you both through the glass. You had gone into the dressing room to try on a dress but the zipper got stuck. Killua wasn't in the store to help so you callled for Gon instead.
"Gon, can you help me with the zipper, it's stuck." You said from inside the dressing room.
"Sure." He said coming in and helping. (You were fully covered, it's not like the dress was super revealing) killua must have seen Gon go into the dressing room with you because a second later he swung the curtain right open. (It wasn't a door dressing room, they were curtains) He suddenly grabbed Gon and pulled him away from you.
"What the hell is going on here!?" He yelled. You turned to him, angry by about his reaction.
"Killua!?" You yelled.
"Why did you do that!?"
"Because Gon was in here with you." He said, angry.
"The only reason Gon was in here with me was because my zipper was stuck, and this wouldn't have happened if you would've just came in with us instead of waiting outside because you don't like this store." You said as you pushed him out of the dressing room and shut the curtain to change out of the dress and back into your normal clothes.
When you were done you walked out and grabbed Gons hand. You just wanted to hang out with Gon for one day without killua being jealous and making a big fuss.

     After you left the store killua was still walking behind you but farther away.
"I'm sorry, I don't know why he reacted that way." You said to Gon.
"No it's fine, he's just a bit jealous. Wanna go get a big pretzel?" He said as you pasted a Wetzels Pretzels. You chuckled.
"Yeah."

     You both got one pretzel to share, since they're pretty big. The prezel was really good but you didn't get to finish it because killua came up behind you and pulled you away from Gon again.
"We're leaving." He said in a cold voice.
"What!? Why?" You said confused.
"Because I said so." He said. You were about to protest when you noticed his cold glare and then suddenly felt to scared.
"I'm sorry Gon, I guess we have to go." You said hugging him goodbye. He hugged you back.
"It's okay." He said before killua grabbed your hand, leading you out of the mall.

     When you got back to killua house, he shoved you into his room.
"What the hell!?" He yelled slamming the door behind him.
"What!?" You asked confused.
"Why did you act like that with Gon!?" He yelled, really angry.
"Like what!?"
"Like what!? Like a slut!" He yelled. His words caught you off guard and you just stayed silent.
"Calling him into the dressing room with you while you were changing! Like what the hell!?" He yelled.
"Sharing food! The nonstop hugging! Not letting me touch you!" He yelled at you and you started to feel scared.
"Well I hadn't seen him in awhile, because it's kinda hard to do that when you get kidnapped by a fucking crazy psychopath!" You yell. When suddenly you feel a sharp pain in your face and you fall to the ground. Killua just...slapped you. You grab your face in shock and start to cry.
"Oh my god, I'm so sorry I didn't mean to. Something came over me, I was just really angry." Killua said kneeling down, reaching for your hand. You slapped his hand away and ran into the bathroom, locking the door. You just sat there and cried. He started knocking on the door and trying to get in.
"Y/n I'm sorry please open the door." He says in an apologetic manner. You ignored him and sit in the bathroom alone. You sat there crying and wondering if you even liked staying with him. You wanted to escape and go back to your old life. When you lived with your mom and went to school with your friends. You wanted to live your life again.