This is a fan fiction of the, The Mortal Instruments, set after the events of TMI: City of Heavenly Fire. This will be a sizzy based fanfic explaining their life after Sebastian's death and Simon becoming a Shadow Hunter.

DISCLAIMER: The Mortal Instruments series and the characters presented are all owned by Cassandra Clare. MASSIVE SPOILERS FOR EVERY BOOK IN THE TMI SERIES.

"So first we are going to start with regular armed combat." Isabelle stood some distance from Simon in the training hall. There were rooms that held different training equipment. One room had rock and rope climbing, to train people in appropriate and speedy climbing methods in dangerous situations. Others had targets for archery or knife throwing; however the one Isabelle and him were using was the largest room in the center of the hall: the combat room. This room could be used for regular hand to hand combat or armed combat.

"Choose any weapon you'd like." Isabelle slid the duffel bag fill with different weapons of different shapes and sizes. Simon picked up two seraph blades and six throwing knives. Simon was in the usual shadow hunter gear and strapped the weapons to their respective places: the seraph blades were at his back and the throwing knives on the outer sides of his thighs. The gear had a way of showing off all of Simon's new found muscle definition; which he gained through tough weeks of basic training. While getting prepared Simon recalled his first lessons in training, that he would have to apply in combat.

For the beginning of Simon's training, when he first ascended to a Shadow Hunter, he trained his balance and wall climbing skills with Jace. Simon has always been clumsy, so needless to say when he was forced to stand and often run on tiny platforms that floated ten, twenty, or more feet off the ground, Simon often fell. Every five minutes Jace would have to use iratze on him, just for him to stand back up and continue training. It became a routine for them, try to balance, fall, use iratze, then try again, like a never ending loop. Luckily, despite Jace's infuriating "Jaceness", he actually knew what he was talking about. How to shift his weight to the right places, or how to spread his toes to get a good foundation, and with in a few weeks Simon finished his balance training. After his balance training was done, he needed to work on his endurance and climbing training which took even longer, due to the lack of upper and lower body endurance Simon had.

Alec then helped Simon with his knowledge of practically everything that had to do with weapons. How they are made, the different types, and how to use every single one of them, and the different styles that goes with each one. He began to realize that he was a fan of dual wielding seraph blades. Next Alec assessed Simon's current skill level in combat. From there countless number of bouts and use of manikins Alec deduced that due to Simon previously being a vampire he tends to stick with low battle stances and quick smooth take downs, such as blows to the temple, or slicing the sides of the neck with seraph blades. Alec also realized that Simon's speed was outstanding as well, however easily dealt with. Simon's had no technique. He did not know how to apply his balance training into combat, which made it very easy to knock him off his feet and subdue him. Not to mention his tolerance for pain was very very low. For the next couple of weeks Simon and Alec trained in hand to hand and armed combat, mainly focusing on battle strategy and technique. Sadly Simon wasn't a very quick learner and ended up getting injured, A LOT. Once Simon broke his hand throwing a punch and having it connect with the wall. Needless to say they ended that training session early that day for Simon to recover.

Now it was Isabelle's turn to train him in combat. Simon finished with his preparations and pulled out both seraph blades and held them down at his sides waiting for Isabelle to grab her weapon of choice; which he thought would obviously be her whip. When izzy moved to grab the duffel bag and moved it to the side without taking a weapon Simon became confused. "Aren't you going to grab your whip?"

"Nope, I think I'll do just fine without it." Izzy said smiling.

"Okaaaay now I know that you are a very good fighter but, even Alec had to use a seraph blade when training me. I don't want to seriously hurt you." As soon as he said it he knew he over stepped his boundary, and wished he could take his words back.

Isabelle scoffed, "You? Hurt me?'" She gave a waving gesture for him to attack her, "let's just see you try."

Simon dashed towards raising his arms that held his weapons and sliced down at her in a diagonal motion towards to right side of her neck. Isabelle ducked her head while spinning towards his strike put her foot behind his grabbed his neck and pushed him allowing him to trip over the foot she had planted behind his. Simon then found himself plummeting to the ground, head first, then landing hard. He closed his eyes in preparation for the incredible impact. When he opened his eyes he saw izzy smiling at him, "What did you say about hurting me? Now who's hurting who?" She leaned down and kissed him on the cheek, then helped him back to his feet. "Simon the good thing about having two weapons is that you don't have to use both at the same time. What you should have done was throw a faint with one sword causing me to dodge or block, then strike me while I'm off guard. Also, be aware of your surroundings. It should not be that easy to take you your feet, if you are on the floor you are dead. Okay babe." Simon barely heard her over the ringing in his ears and the banging of his head, but he did feel her lips on his as she kissed and told him to go back and try again.

Simon retreated to gain some distance and think of a place to strike. He slowly reduced the distance between Isabelle and himself, and when he was close enough to strike he sliced his blade horizontally towards Izzy's torso causing her to jump back only for Simon to slice his other blade downward through the air towards her. She spins out of the way and begins to run away, while running she turns and blows a kiss towards Simon egging him on. Simon realizes that she is just playing with him and runs after her. Wanting her to take him seriously he begins to slash at her lower body to knock her off balance, but Isabelle is just to fast and he only slices air. Simon stops, beginning to feel winded and feels something hitting his chest causing him to fly backwards onto the floor and release and air he had left in his lungs. The pain was excruciating, like needles jabbing his lungs. He was blinded with pain and everything was fuzzy around him. Isabelle helped him to his feet patting his back, "Aw my poor baby, that is why you don't waste energy. When you get winded your movements begin to lag leaving openings for you opponent to strike you at full power." She was talking to him very slowly, like how one would speak to a small toddler, making sure they her every word clearly.

Angry and humiliated Simon stood up and pushed past Isabelle, "I'm done for today. I'm sorry but I don't feel like being humiliated and abused today." He almost made it to the door when something wrapped around his right ankle knocking him the floor and began sliding away from the door back towards Isabelle. He turned to see a whip wrapped tightly around his ankle and Isabelle dragging him back.

"I told you this morning that you were going to pay for mocking me, now man up and learn your lesson. Today is my day to train you and as trainer what I say goes. No one is coming in or out of this room unless I say so." By the time she finished Simon was directly below her. She leaned down her face directly in front of his, "Okay?" In response Simon nodded his head. I am actually going to die, Simon thought, I'm going to to be killed by a mad women.

"Now I think I have given you enough pointers in armed combat so let's switch to hand to hand combat." Simon gave a reluctant and went to put the seraph blades and throwing knives back into the bag."I think I know why you're having a hard time learning combat: you're lacking motivation. Now how about this with every blow you land on me you will be rewarded. And as an added bonus, we can stop your training for today." Simon did not exactly know what these "rewards" would be but nevertheless he wanted to find out. Alec had taught him the basic guard stance when in hand to hand combat, so to start Simon got into the that stance. He decided to wait for Izzy to strike first. Isabelle dashed forward throwing a straight right, and Simon put up and guard to block it but it vanished from sight and he felt himself once again being knocked to the ground. Isabelle threw the straight as a faint and when Simon was focused on it she knelt down and kick his feet right from under him.

"Hmm. I see what you did there, but waiting for someone to strike is stupid unless you are prepared for everything they will throw at you; which obviously you weren't. And remember what I said about faints, well you must learn how to spot one depending where our opponents body weight is positioned. Get up and try again."

Simon stood and threw a right jab of his own but izzy caught it and pulled him close twisting herself around towards his back, still holding his arm, and made it so that his arm was around his own neck strangling him. She blew into his ear saying, "Nice try". Simon broke free and gained distance between them. He rushed towards he and tried to use his superior height and build to knock her off her feet, but was simply caught in a head lock. Isabelle grunted," Ooooh, now you're thinking, using your natural height and build against a smaller opponent, very smart. However if I position myself a certain way I can lessen your advantage." She began to knee him in the gut. As one of her knees struck him again Simon grabbed onto the knee finally knocking her off her balance lifting her up, then slamming her back onto the floor with his shoulder ramming into her gut. He could her the wind knock out of her as she gasped for air. He too was out of breath and just laid on top of her, hoping his weight would stop her from getting free. He thought wrong, once Isabelle gained her breath she threw Simon to the side and mounted him. She put her left forearm on his throat and lifted her fist into the air ready to strike.

"Wait wait, you said if I land a blow in you we could stop training for today, remember." Simon sounded as if he was pleading for her to stop.

Isabelle stood and walked towards the door leaving Simon there laying on the floor. "Some training," he said to himself and lifted himself off the ground and limped towards Isabelle. "Wait Izzy what about some iratze for my injuries?"

Isabelle looked back at him and said,"Nope you're going to heal like a human," and walked out of the room.

Simon stood there with his mouth parted in disbelief of his her words,"yeah can't look back now," he said remembering the words he spoke to Clary. He walked out of the room shutting off the lights watching the room go dark.

AUTHOR'S NOTE: This one was a really long one. I will post Simon's "Reward" next as a very very small chapter. I'll try to keep it very rated T, if you know what mean. lol XD