Malec oneshots 2 + a little Shumdario

Crossover 3

There stood Sirius Lupin-Black and his husband Remus Lupin-Black, "Please tell me we didn't come all the way to kill two humans", Jace muttered to Alec apparently sad he couldn't kill some demons.

"I think I know who they are", Alec said, "Weapons down", he said and they all retracted their weapons glamouring them.

"Woah, that's cool", Sirius said walking in with his husband who was shaking his head, "You must be Sirius and Remus Lupin-Black", Alec said and they nodded surprised.

"How do you know we are married?", Remus asked, "The rings", Alec said gesturing to their wedding rings.

"I am-", Alec started, "We know all of you, you guys are famous", Sirius said and they smiled, "Sirius?", Harry said.

"Oh hey Prongslet", Sirius said, "Did you really need to come like that, I was excited about nothing", Jace said and Remus saw James and Sirius in him.

"Sorry, but that's how we usually enter", Sirius said, "How he usually enters", Remus said and they all smiled, "Wizards and witches, take a break", Alec said and they all sat down but still was listening to their conversation.

"I am sorry about your loss", Alec said meaning James and Lily, Sirius and Remus smiled sadly, "Thank you, but really we should be the ones saying that", Remus said.

He meant Max Lightwood, Jocelyn Fairchild, Ragnor Fell, Livvia Blackthorn, Raphael Santiago, Jordon Kyle, and many more.

"I mean our losses are nothing compared to yours", Sirius said and the Shadowhunters smiled sadly.

"It's not how much we lose, it's who we lose", Clary said, "Besides we are shadowhunters, we were trained for this", Jace said and they all shared a quick moment.

Suddenly one of the dummies fell forcefully to the floor with dark red magic and the shadowhunters looked shocked.

"What did you guys do?", Alec asked, "What do you mean?", Sirius asked looking everywhere else.

"I know my husband's magic, and that is very very angry magic", Alec said, "I wasn't involved in this", Remus quickly said glaring at Sirius.

"Ok ok, I may have put some things in Magnus's potion, which would burst and make Magnus's hair slimy and green", Sirius admitted.

The shadowhunters eyes widened, "We should run now", Jace said scared and Simon nodded, "Great idea", he said.

"SIRIUS ORION BLACK", Magnus shouted entering and all winced, "Alec please", Izzy said and Alec sighed and rushed to his husband.

"Magnus, honey", Alec started, "Don't Lightwood", Magnus said and Alec held Magnus's waist stopping him from charging towards Sirius.

"It's ok, you can change it back with magic", Alec said and Magnus went to protest, "Magnus", Alec said again and Magnus sighed and snapped his fingers making his hair normal again.

He again snapped making Sirius's hair short and turning its color blue, all started laughing, "That makes us even", Magnus said smirking.

"Hey", Sirius said, "Magnus", Alec said again, "Alexander", Magnus said, "We are Professors here", Alec said and Magnus sighed.

"Fine", he said and turned Sirius's hair back to normal, "By the way it's Lupin-Black now", Sirius said and Magnus's face lit up.

"Please don't say you knew it", Remus said and Magnus shrugged, "Everyone knew it except you two", Magnus said.

"Oh Merlin", Remus said, "That's right", Magnus said, "Fine, but we couldn't contact you for our marriage, where were you?", Sirius asked.

"Let's say not everything was good in our world", Magnus said looking at his family, "That's one way to put it", Jace scoffed.

"Ok, we should catch up, but we really have some work to do", Alec said gesturing to their students, "We would love to watch", Sirius said looking at Remus who nodded.

"You guys can sit and watch", Alec said chuckling, "Magnus, what about you?", Alec asked, "I finished my class, I have an hour's break", Magnus said and Alec nodded.

"Ok students, you are all doing well, does anyone have any doubts so far?", Alec asked, "How does an actual fight look like?", Ginny asked.

"Well, you can't explain it, but I think Alec and Jace can show you that", Izzy said smirking, "I don't think-", Alec started but they all started chanting for a fight.

Alec and Jace looked at each other and Alec nodded questioningly, Jace smirked and nodded, and both went to the middle of the stage.

"Both?", Alec asked, "Both", Jace confirmed and they de-glamoured their weapons and started fighting.

(Something similar to this)

"So are you planning on having any kids after Max?", Jace asked pinning Alec, "I don't know, Max is still young", Alec said mischievously, which Jace failed to grasp.

"I and Clary had Matthew when Alisha was 2, Max is turning 2, it's high time he has a brother or sister", Jace said as they continued fighting.

"Besides, Angel Raziel said you have to give birth to Angel Ithuriel, so when are you planning on having the little angel?", Jace asked.

"I think that's for me and Magnus to decide and you should worry about your fighting", Alec said pinning Jace who sighed and tapped out.

Alec smirked and helped Jace up, they turned to see the Wizarding people's jaws on the floor, "That was hot", Sirius said.

"That's my husband you are talking about", Magnus said, "But I agree, he is hot", Magnus continued.

"I meant the fight", Sirius said and Magnus rolled his eyes, "My husband is still hotter", Magnus said.

"Ookay, we are teaching here", Izzy said, although she was loving it, "That's what a fun fight looks like", Clary said.

"Fun fight? That was deadly, you could have died", Hermione said coming out of shock, "We do that all the time, besides that wasn't our full potential", Jace said boasting and Alec rolled his eyes and smacked Jace behind the head.

"Stop boasting", he said, "But yes as he said, that's similar to how we fight and you have to learn it", Alec said and all the students looked at him as if he was crazy.

Thankfully for them the bell rang at that time, "That's it for today, we'll meet you tomorrow", Alec said and they said thanks and left.

"So we have news", Sirius said to the shadowhunters who nodded, "We may have seen the demons and we have the picture of it", Remus said.

"That's great, that will help us", Clary said and Remus gave them the papers, no one knew what they were.

Alec saw it and felt as if he knew, "Magnus?", he called and the warlock stood next to his husband.

"Please tell me this is not the demon leader", he said gesturing to the biggest demon in the drawing, a little larger than an average human.

"We are not sure, but we think", Remus said, "You know who it is?", Jace asked and Magnus nodded.

"We all know him, the big bad, leader to all", Magnus said and the others groaned, "Please don't tell me it's him", Simon groaned.

"I am afraid it is", Magnus said, "Woah woah slow down, who is it?", Sirius asked, "Well...", Magnus trailed looking at others.