So, thought I should update this when I remembered I have heaps written for it. Enjoy!

Characters/Parents:

Jace, 42/Clary, 41
- Finlay Jonathon Herondale, 17
- James Luke Herondale, 19
- Ayla Joyce Herondale, 15
- Kyle Herondale, 15

Simon, 43/Izzy, 42
- Michael Lewis, 19
- Olivia Lewis, 16
- Cheyenne Lewis, 13

Magnus/Alec, 43
- Henry Lightwood-Bane, 17 (shadowhunter)
- Chloe Lightwood-Bane, 9 (mundane who has the sight)
- Raphael Santiago Lightwood-Bane, 26
- Max Michael Lightwood-Bane, 24

Bat, 45/Maia, 42
- Xavier Roberts, 18
- Seth Roberts, 16

The first night where everyone came home from school was always a designated sleepover night. All the kids; including those who had moved out, and all the parents slept over at the institute. It was crazy fun, but Liv found herself dreading this night more than looking forward to it. Typically, once the parents had gone to sleep the kids all converged in the library and stayed up late playing games, drinking (only those above sixteen) and just catching up away from school.

The customary knock on her door let her know that someone (usually Max) had ensured the parents were asleep and the library was clear. The parents all slept down the opposite end of the second floor to where the library was so they rarely got caught. That, added to the fact that whoever built the institute all those years ago made sure the walls were relatively sound proof.

Olivia slipped out of bed and pulled a light sweatshirt over her tanktop, answering the door just as another knock sounded. This one came from Finn. She opened the door with a smile, reaching up to brush her lips against her boyfriends. Finn grinned against her lips and gently pushed a piece of hair behind her face when they broke away.

"Sorry about before, that could have gone better."

"No shit." Olivia groaned and buried her head into Finns chest. "They all hate me."

"They don't hate you Liv, Mike and your dad might just need time to come around. But don't worry, they will. And everyone else seemed okay with it."

"Yes apparently they've seen it coming. I didn't even see it coming until you grabbed me in the hallway and kissed me a few months back."
Finn chuckled. "I never was very subtle. You don't think we're actually…"

"…blood related?" Liv shivered a little in disgust. "No, I went to the library a few weeks back and looked up the linage and stuff to make sure. Apparently you have an ancestor called Will from like ages ago, and his sister married Gabriel Lightwood, my great great someone."

Finlay went pale. "Doesn't that mean that we share blood, even if it is a miniscule amount?"

Live wrinkled her nose. "No, I kept digging cause I didn't want to accept that as the end of our relationship," she said with a slight blush, "apparently, unknown to many, Cecily Herondale; Will Herondale's sister was adopted. So when she married Gabriel no Herondale blood was there." Olivia watched as the blood returned to Finns cheeks and she smiled broadly. "So no blood relation."

In happiness he ducked down and kissed her again, one hand moving down to rest on her waist and the other gently caressing her cheek. Her lips were soft against his and he tentatively pushed his tongue into her mouth where it was greeted by hers. Liv let out a soft moan but-

"What the hell are you guys doing, you're supposed to be downstairs."

Olivia stepped away from Finn and turned to glare at Michael. "I'm trying to get some, which maybe you should think about doing too so you're not so uptight all the time!" Finn barely managed to suppress his laughter and Michael gaped at the two of them.

"Let's go Finn!" She dragged him behind her and down the stairs to where the library was. Upon entering they found everyone spread across the room, talking and playing games. In the corner liv spied a rather large stash of alcohol she knew would be distributed once the younger kids went to sleep.

An hour and a half later James, ever the responsible one was trying to get the young ones to go to bed.

"Chey, it's just gone midnight, you should be getting to bed."

Chey rolled her eyes behind her glasses. "Please it's not like I don't know what you guys get up to here."

"Chey you're just reading anyway, you can do that in your room," Olivia pointed out to her younger sister.

"Can't I just stay down here? I don't like being the only one up there."

"You won't be, Chloe and the twins are also going up." Chloe was yawning sleepily and rubbing her eyes from where she was curled into her brother Henrys lap.

"We are not!" Kyle yelled from the table where he was playing poker with Seth and Finn. "We're old enough to stay!"

James rolled his eyes. "Kyle, you're only fifteen. You know you can't stay until you're sixteen."

"Please, all you guys do is play dumb drinking games. I'm not sure what things were like when you went to the Academy but we start the drinking a lot earlier these days."

"What? Kyle, are you kidding?"

"He's not, James." Ayla added on. "Of course it's mainly Kyle and his friends doing the drinking after curfew."

Kyle rolled his eyes at his twin. "Oh bullshit La, you know you've had your fair share as well."

Ayla smirked, refusing to give away any more information.

"Come on Chey, please? We've all had our turns of going to bed early. I'll come and help you get Chlo sorted if you want?" Henry pleaded.

Chey groaned. "You guys owe me! And it's alright, I can put her down." She gently picked up the sleeping girl who barely even noticed. Despite being seven she was light as a feather so Cheyenne had no trouble carrying the girl to her room.

The library door closed behind Chey with a click and immediately the alcohol was out on the table and shot glasses were being lined up.

"Alright Kyle, since you were so adamant on being included, you can go first. The rules are if you don't want to do something you have to take a shot. At the end of the night whoever refuses the most amount of dares will become the victim of the next week." Finlay started.

Kyle blinked. "That's how you decide that?" Every year someone was picked as the 'victim'. Basically, for a week the rest of the group could pull as many pranks and jokes on them as they wanted without repercussions from the victim; they weren't allowed to fight back. The pranks couldn't be harmful and if you got caught by the parents you had to deal with the consequences but you couldn't tell them about the game.

The rest of the group nodded and Kyle looked around with a smug expression on his face. "Give me your best."

The group huddled into a circle and deliberated for a few minutes before they broke apart.

"Alright, Kyle. Your dare is to go and find Isabelle, Clary, and Magnus's shampoo and replace them with hair removal."

"Hah, easy. Won't they be mad though? That can cause actual permanent consequences."

"Nah, we do it almost every year so they're expecting it, and Magnus can pull some magic shit to reverse it. The trick is to do it without being caught because like I said; they're expecting it." Kyle rolled his eyes. They were trying to spook him but he would prove them wrong; he could do this easy.

Michael pulled out three bottles of hair remover and handed them to Kyle who took them and stood to his feet.

"So I've just got to replace their shampoo with this?"

The group nodded, and Kyle set out on his way.

Once outside the library door, Kyle slipped his steele out of his pocket and quickly drew on silence runes. He padded carefully through the institute halls and tried not to jump every time he passed a mirror and saw his reflection. It was eerily quiet in the hallway. The small amount of noise heard from the library had long since died away and it was just him and his breaths. He finally came to the bedroom section and glanced carefully between the doors. On a whim he chose the first door on his right and had to hold in a sigh of relief when he realized he had chosen his parents room. While Jace would be angry if he caught Kyle, he knew what to expect from his dad. If Clary woke though, he'd probably be grounded until school went back.

He carefully walked into the room, trying his hardest to navigate in the pitch black. He'd had to close the door behind him to stop the light spilling in and run a higher risk of his parents waking. With only one slight stumble and a muffled curse he found his way into the ensuite and pulled the shower open. As silently as he could he grabbed his mums shampoo and placed the other bottle in. He was silently congratulating himself when the unthinkable happened.

His foot, which had been in the shower slipped on a bit of leftover water as he turned to leave. His foot went out behind him and he fell to the floor with a muffled crash (apparently the silence rune was still working), the bottles also falling around him with their own thuds. He cringed, expecting the worst but was pleasantly surprised when he didn't hear any sounds of people stirring from the bedroom. He suppressed a grin and stood up as quietly as possible, collected the other bottles and made his way back through the bedroom. He hurried, wanting to be out of there as soon as possible. Where he remembered the door to be he reached out for the handle and was surprised at the texture. It wasn't like that before was it? Suddenly, the 'door handle' moved a little and light flooded the room. Kyle realized he had just been poking around Jace's forearm in an attempt to find the door handle.

He recoiled from his father who was standing with his arms crossed and an annoyed look on his face.

"Kyle? Seriously. Why are you even involved in this, you're too young."

Kyle puffed his chest out smugly. "I convinced James to let me stay. And fair enough, I was doing fine until I slipped in the shower."

Jace rolled his eyes. "Kyle, I woke up the minute you started turning the door handle. We didn't live through and win a war for nothing. Of course we're going to realize when someone's in our room. Now, as much as we usually antagonize the person who fails-"

"Wait they always do this?"

"Yes it's been going for a while. The only people to get away with it on their first try was Liv, Xavier- don't ask me how as it was before he got his official marks, and Raph. He was the one who started it. I must admit I had hoped one of my own children would get it, I guess it's up to Ayla now. Is she in there too?"

Kyle nodded once, causing Jace to groan in annoyance. He was very, sometimes a little too much, protective over his only daughter.

Kyle sighed in defeat. "So I have to go back and tell them I was caught?"

Jace glanced over at Clary who was giving their husband 'the look'. "It's not counted as a failure if only one person catches you. If you can get through Iz and Mangus you'll still pass."

"Wait are you saying you know what happens in the library?"

Kyle heard his mum scoff behind him. "Of course we know, we're not stupid. We decide to let it go though."

Jace grinned and stepped aside to allow their son to pass. "Good luck, don't get caught; do me proud."

Kyle stepped once more into the silence of the hallway and glanced up and down. It appeared that no one else had woken up. He took a deep breath to refocus himself and walked to a door across the hallway. With another deep breath he slowly opened the door and made his way in; only to be frozen in shock.

His uncle Alec and Magnus were moaning and moving around under the duvet, were they-? Kyle had to fight down vomit when he realized that yes, they were in fact having sex. He cringed and tried to back out of the door quickly, but not before he heard his uncle Alec yell "Angel, Magnus keep going-harder!"

Kyle stumbled out of the room and shut the door tight, resting his hands on his knees and breathing deeply. Good Lord he was going to be sick. He tried desperately to forget what he had just seen, but knew that would never happen. Giving up on his mission entirely, he left the bottle behind and ran as fast as he could to the nearest toilet- where he promptly threw up. When he was only dry heaving he flushed the toilet, washed his hands and rinsed out his mouth. He went back to the room, paler than anyone thought possible; he did after all, have his dads golden skin.

"Kyle are you alright? You look like you've seen a ghost."

Kyle shuddered and moved quickly towards the table of alcohol. "I seriously need alcohol."

Back in their room, Alec pushed Magnus off of him. "I think they've gone."

Magnus rolled onto his back and smoothed out is pajama pants. "I wonder who the lucky person was."

"Lucky! It was either one of our children or one of our nieces of nephews. I can't believe I let you talk me into that."

"Serves them right! Trying to mess with my shampoo…honestly who do they think they are?" HE snuggled back down into his husbands embrace and placed a hand on his chest.

"I suppose it was a good way to get payback after all these years."

"Damn right. It's a pity they came when they did, I was starting to enjoy myself…" Magnus grinned into his husband's chest.

Alec slapped his chest affectionately. "Magnus!"

The next morning Kyle was the last person to make it down to the dining room. He entered with his head down and shoulders slouched, trying his hardest to remain invisible.
"Morning sweetheart! How did you sleep?"

Kyle made a vague noise at the back of his throat and sat down, piling his plate with toast and bacon.

"What's up with you?" Jace inquired, seeing his son slouching down and flushed cheeks.

"Nothing," he murmured, breaking off some bacon and shoving it in his mouth. Jace fought back a smirk as he turned to face the others.

"So, what did you guys make him do when he returned?"

Finn scowled. "He wouldn't do anything. He got back, drank about half of the liquor supply and went to bed."

Jace piqued an eyebrow. "Seriously? What happened?"

"Doesn't matter," Kyle mumbled, risking a glance at his Uncle Alec and turning even redder. Almost as red as Alec was. Alec turned to his husband with a glare, clearly seeing how they had traumatized the boy. Magnus, however, was far too amused and merely chuckled as he spread jam on his toast.

"So who was given the shampoo challenge last night? We didn't hear anyone come in." he commented, adding fuel to the fire.

"Kyle."

Jace narrowed his eyes between his son, his parabatai and Magnus. He held his head in his hands and let out a groan. "Please tell me you guys didn't."

Alec looked like a deer caught in headlights while Magnus didn't bother trying to fight back a grin.

"Serves them right."

"You've scarred him for life! Alec, how could you let him talk you into doing this?"

Alec just banged his head on the table in defeat.

"Wait, what happened?" Ayla asked, curious as to what had her twin and uncle so embarrassed. Jace looked at his daughter, and then around at everyone's curious faces.

"Well, it appears that Magnus and Alec decided to fake having sex to scare whoever was sent into their room off. And that was Kyle."

Isabelle laughed loudly at that, as did Finn and Clary. Everyone else, particularly Magnus and Alec's kids looked faintly sick.

"That's nasty!"
"What the hell!"

"You've scarred him for life!"

Magnus laughed harder and flung his arm around Alec's chair.

"Teaching you lot a lesson for trying to mess with my shampoo."

Alec couldn't make eye contact with anyone, especially not Kyle so instead turned his attention to his breakfast. Finally everyone calmed down, only a few comments here or there about what had happened when Chloe spoke up, effectively silencing everyone.

"Daddy, what's sex?"

A/N Please review! They motivate me to update (usually)

- Demonpoxjohnnyboy x