[This imagine was requested by DICKIPLIER , and I hope I do it justice. Enjoy!❤]

Jack recently hit 16 million subscribers, and he wanted to throw a party at the house and invite all his YouTube buddies. You didn't complain, you were friends with them too and were so happy for Jack. You made the invitations and sent them out two weeks before the party. You and Jack went shopping for the party probably way too early. You two were just so excited to see everyone again. Soon, that anticipated day was here. Everyone arrived a day before but stayed in hotels the night before. You decorated the house and hooked up the speakers. You played music as you set up the snacks and drinks. You and Jack made sure you got plenty of alcohol, but also soda and juice for Mark. The doorbell rang and you two excitedly ran to the door. To your disappointment, it was the pizza delivery guy. You paid the guy and Jack took the pizza into the kitchen.

The doorbell rang again and you answered it. You gasped when you saw Mark. You squealed as you hugged Mark and he reciprocated your excitement. You led him inside. You caught up with him as Jack continued whatever he was doing in the kitchen. Little did you know how angry he was. As more people began to enter, the party slowly kicked off. You gave a toast to Jack and everyone chugged their drink. Soon, everyone was dancing and having a great time. Mark had been hanging around you all night, which you didn't mind. You had been friends with Mark for what felt like forever and he was your best friend. You did notice how he kept trying to hold your hand and made little comments here and there. At one point in the night, there were no seats and Mark motioned for you to sit on his lap. You declined and awkwardly stood to the side. The dancing began again, but you decided to watch this time. You sipped your drink as Mark slid next to you.

"Hey! Wanna dance?" He had to almost yell over the music.

"No, thanks. I'm kinda tired plus I'm waiting for Jack to come back from the bathroom."

"You sure you don't wanna dance with this hot bod?" He motioned down his body and you laughed.

"No, thanks. I've got a different hot bod to dance with," you shot him a wink.

"Okay well suit yourself."

You stayed by the wall as he made his way into the crowd. Where the hell is Jack? He should be back by now. Ten minutes passed and you decided to dance.

"Hey so you decided to take up my offer?" Mark asked as he danced by you.

"I'm riding solo."

"Aw, cmon. One dance won't kill ya."

Well, Jack left me alone and it's just one dance. "Alright, fine. You win."

"Yay!" Mark said as he began to dance with you. He spun you around and dipped you, causing you to giggle. He then placed his hands on your waist and began to slowly grind on you. You didn't mind it at first until he began to grind faster and harder. You soon pushed him away and walked away.

"(Y/N)! Wait!" Mark yelled as he followed you. You continued walking forward and out the backdoor to where the pool was.

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(Jack's P.O.V.)

I saw everything. The attempted hand grabs, the awkward gestures. I heard the comments he made, and it made me infuriated. I watched from a distance the whole night, fueling my anger each time I saw him. I don't know if it was the alcohol or extreme jealousy over (Y/N) that made me do it, but I followed Mark around all night and waited for my moment to strike. I lost him once, and only once. I soon found him out the backdoor kissing (Y/N)? Now I was livid. No one touches my girlfriend except me. I slid  the glass door open and threw Mark away from her.

"Hey, Jack! What's up, buddy?" I slammed my fist into his face. He stumbled back and held his face. "What the hell dude?"

"Don't touch my girlfriend."

"What the hell are you talking about?"
I punched him again. "She was totally enjoying herself."

I looked over at (Y/N). She looked scared at my actions, but also disgusted at Mark.

"I thought you were my best friend, Mark." I spat at him.

"I am."

"Best friends don't kiss each other's girlfriends."

"Why are you so pissed at me? She was asking for it." I punched him one more time before turning to (Y/N).

"Did you?"

"No, Jack, I swear. He tried to grind on me when we were dancing and he followed me out here and then kissed me."

I turned back to Mark who was on the ground. I kicked him once before picking him back up. He looked at me, confused.

"Don't you ever touch her again or god forbid I will kill you." The words dripped out of my mouth like venom. He nodded and I smiled. "Let's get you cleaned up, shall we?"

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Jack had always been the overprotective and jealous type. You never thought he would ever act upon it, though. When he found you outside with Mark, you could practically feel the anger radiating off of his body. He looked scary and intimidating. You watched him bang up Mark a couple of times before taking him inside. Damn, it was so hot when he was jealous. But you wouldn't dare tell him that. It would only make him more protective to the point where even if another male looked at you he'd be up their a*s. You just followed him inside and offered to help clean up Mark. You shooed Jack away and he reluctantly left. You dabbed a cool and wet towel on Mark's swollen face.

"(Y/N), I'm sorry. I don't know what got into me."

"It's okay, Mark, but I don't think you should be apologizing to me."

"I've never seen Sean get so worked up before. He was so pissed!"

"Me either."

"I guess that means he really likes you then."

"Can I tell you something, Mark?"

"Of course."

"I thought it was hot when Jack was super jealous."

"Really?"

"Yes, but don't tell him. I don't need him watching my every move."

"Your secret's safe with me."

"Good, your face looks better now."

"Gee, thanks."

You just laughed and walked out of the bathroom. Jack was soon by your side with his arm around your waist. Soon, everyone left and it was just you and Jack.

"Hey, sorry for being so overprotective earlier. I shouldn't hurt Mark so bad."

"It's alright, Jack. I'm honestly kinda glad you were there."

"I could tell I scared you, though."

"Just a little bit. I just thought that I would have to stop you if you kept on punching him."

"I'm sorry, (Y/N). I just get so jealous when I see other men look at you and touch you. I just realize how lucky I am to have you and I don't want anyone to take you away from me."

"Don't worry, Jack. You couldn't get rid of me if you tried to."