Hey guys!

So after I read The Infernal Devices – and cried my heart out – I totally fell in love with Tessa, Jem, and Will. After reading a few fanfictions, I decided to write one myself and suddenly it popped into my head: why not write one with both the characters of the Mortal Instruments AND the Infernal Devices?

Happy reading!

Disclaimer: I do not own the Mortal Instruments or the Infernal Devices.

"So it's gonna be forever, or it's gonna go down in flames. You can tell me when it's over, if the high was worth the pain. Got a long list of ex-lovers, they'll tell you I'm insane. Cos you know I love the players, and you love the game."

- Blank Space, Taylor Swift

Prologue

Tessa Gray did not consider herself a hot-tempered person.

In fact, she rather prided herself on her ability to keep her cool in any situation, no matter how tense. She was the peacemaker, the calm one, the collected one. Tessa had never met someone she couldn't handle before.

And then she had the great misfortune to meet Will Herondale.

Otherwise known as the bane of her existence.

In all honesty, Tessa didn't think there was anyone – apart from Jem – who could walk away from a conversation with Will without wanting to tear their hair out and scream from pure frustration.

So she felt it was perfectly justified to slap him in the middle of the cafeteria.

"Was it something I said?" Will asked mildly, not looking fazed in the least. His midnight blue eyes sparkled with amusement - the same eyes that so many girls swooned over. It was too bad, Tessa thought, that the beauty could not mask the terrible personality.

"God, Will!" Tessa yelled. "Just go!"

"Go where, if you please?" Will inquired, as if asking the time.

"Go to France, go to Russia, go wherever you want! Just go far away from me!"

"You wound me, Tess," he cried dramatically. "Right here." He placed his hand over his heart, looking for all the world as if she had just stabbed him with a sword.

Before Tessa could retaliate, someone else stepped forward, someone with blonde hair and a charming smile, and clapped a hand on Will's shoulder. "Must be losing your touch, bro," Jace drawled. "Finally willing to admit defeat and accept that I have a better way with the ladies?"

Will scoffed. "Please. Like you could do any better."

Without missing a beat, Jace turned to the red-haired girl who stood by Tessa's side, her emerald eyes widening with horror as Jace's gaze landed on her. Don't you dare, Herondale.

"Clary darling," Jace smiled flirtatiously, "go out with me this Saturday, will you?"

"In your dreams," Clary retorted, grabbing Tessa's arm and pulling her away. "Come on, Tessa, let's go. It's no use. These two will never change."

The two girls walked away as whispers broke out across the cafeteria like little hissing fires. The students of Shadowhunter High had just found a new topic of gossip for the next few days - Tessa and Clary.

"Every single time man," Jace sighed, dropping his hand. "What is it with the two of them?"

"I don't know," Will scowled, "but I certainly don't like it. It's like they're immune to us or something."

"A word of advice," Jem offered, stepping forward. "If you really want to win them over, why don't you stop flirting with every girl you meet and focus on them. Show them that you've changed."

Both brothers stared at him like he had just told them that he was going to strip naked and dance in the middle of the cafeteria.

Suddenly, Jace's golden eyes lit up.

"That's it!" He clapped Jem hard on the back. "Dude, you are a genius!"

"Oh shit," Alec sighed. "This is going to be bad."

"Hey!" Jace stopped, looking affronted. "My ideas are not bad!"

"Really?" Alec raised an eyebrow. "What about that time you decided it would be fun to try to jump into the pool from the treehouse?"

"Or when you drank all that tequila - underage, might I add - and ran down the street naked?"

"Or when you tried to feed the poultry pie to the ducks to see if you could breed a race of cannibal mallards?"

"That one was Will's idea!" Jace protested.

"But you executed it," Jem reminded him.

"They ate it too," Will reminisced. "Bloodthirsty little beasts."

"Can we get back to the point here?" Jace asked impatiently. "Clary and Tessa. Man, if we can get them – we'd be known as the ultimate sex gods."

Alec and Jem exchanged commiserating glances. Being friends with the Herondales was an exhausting job, one that required them to work 24/7 and buy medical insurance.

"So, what about this plan of yours?" Will asked.

"Just like Jem said," Jace explained. "We make them believe that we've changed. We stop flirting with every other girl and focus solely on them, and treat them so well that they fall for us. Then we'll have played them good and well. Problem solved!"

"Whoa, whoa, time-out," Jem interjected. "Jace, that's low - even for you. I haven't said anything before because the Angel knows it's impossible to get you to change. But this is different. You aren't just going to break their hearts; you're lying to them, making them believe that you changed. Can you really live with that on your conscience?"

"Jem," Will said seriously. "It's just a bit of fun. Back off, will you?"

Jem looked to Alec for support. The dark-haired boy sighed, knowing it was futile even as he spoke. "Think about Cecily," he started, voice cajoling. "How would you feel if someone treated her that way? If someone broke her heart?"

Jace and Will hesitated. "Cecy's a tough girl," Jace shrugged. "I'd like to see the guy who can play her. It'll be fine, guys. Relax."

Jem and Alec knew there was nothing more they could say to change the minds of the two Herondales. They were like freight trains; they wouldn't stop until they reached their destination.

"No flirting or hook-ups, though," Will groaned. "That's going to be hard."

"It's just for a few weeks," Jace shrugged. "A month, max. How hard can it be to fall in love with us?"

"Those Herondale boys are the limit!" Tessa raged, pacing up and down. "They think the whole world is just dying to fall at their feet!"

"I know!" Clary burst, her green eyes blazing with anger. "And Jace has the nerve to ask me out – asshole thinks he's God's gift to women!"

"If Will vanished off the face of the Earth, I'd throw a party! Honestly, his head is so big I'm surprised it doesn't burst!"

Isabelle and Sophie sighed as they watched their friends. They weren't surprised; this outburst was tame compared to some of the others they had endured. Isabelle looked at her watch – this one had lasted twenty minutes and by the looks of it, it would go on much longer.

She gave Sophie a covert nudge, which meant: Who's going to break up their little rant fest?

Sophie nudged back. I did it last time; it's your turn.

Isabelle sighed. Damn it.

She got to her feet rather half-heartedly. "Tessa, it's time for English Lit."

Normally, the mention of English Lit would have drawn Tessa's attention. For some reason Isabelle couldn't understand, Tessa loved old English novels – Charles Dickens, William Shakespeare and the like. When Mr Wayland had announced that they would be studying A Tale of Two Cities, Isabelle had thought that Tessa might jump up in class and start doing the Macarena.

Today, however, the mention of English Lit just caused Tessa to keep going.

"No way!" Tessa shrieked. "I know he's just waiting for me to come so that he can torture me."

"Tessa," Isabelle explained patiently. "You have to go to English Lit. It's mandatory. If you don't, you'll get a detention. Is that really what you want?"

Tessa stopped in her tracks, frowning at Isabelle. "Fine. But if he even dares to try anything, I'll – "

Clary snapped her fingers. "That's it! I've got it!"

All three girls looked at her. "Got what?" Sophie questioned. "Clary, please don't tell me you've cooked up some crazy plan for revenge."

Clary grinned at the brunette. "Actually, I have. But it's not crazy."

"What is it?" Tessa asked warily, crossing her arms over her chest.

"We beat them at their own game," Clary announced. "We reel them in and make them fall hook, line and sinker for us. We make them believe that we love them too - and then break their hearts."

Sophie looked uncertain. "Clary, I know they're completely infuriating. I know you hate them. But are you really sure you can pull that off? Do that to them?"

"Why not?" Clary demanded. "They do it, Sophie. It's like a game to them. They play girls and break their hearts and then they laugh about it. Do you know how much hurt they've caused? How many girls cry because of them? But they don't even care, Soph. They only care about themselves."

"I'm with Clary," Tessa added. "Let them have a taste of their own medicine for once."

Isabelle looked unconvinced. "You do know the number one rule in playing a player, don't you?"

"And what rule is that?" Clary asked.

"Never fall in love with him."

Both Tessa and Clary shot Isabelle incredulous looks.

"Who, us?" Tessa laughed. "Fall in love with them? No chance."

"It's impossible," Clary agreed. "We're going to make them fall for us. So Tessa, are you ready to play the players?"

Tessa nodded firmly. "How hard can it be, after all?"

Oh darlings, you have no idea what you're in for.

So, there you have the premise of the story. Tessa and Clary – and Jace and Will – have the same goals: to make the other two fall in love with them. And you know this is going to lead to a whole load of trouble.

Till next time!