Hey I'm probably updating too much but when I'm bored I write so... here is a little bit of Sizzy, this chapter will be a lot more nice and romantic almost, but afterwards tell me if you prefer fluffy lemons or darker themed lemons. This will be set after City of Heavenly Fire where Simon is training to become a shadowhunter. Hope you enjoy!

All characters belong to the wonderful Cassandra Clare =]

Simon was tired. Tired of having to do so much extra work in order to be able to catch up with a twelve year old, tired of all the early mornings and late nights, tired of the constant strain in his mind as he tried to remember events of the past... He had all these worries that he would never be a good enough shadowhunter and they were keeping him up at night. As he lay on the bed with Isabelle curled into his side, her black hair feathered out across the pillow so that it tickled his shoulder, he turned to look at the clock by their bed. It was just past three in the morning he noted, and he groaned quietly, frustrated. He had to be up in three hours if he wanted to get to the institute on time. His groan was louder than he meant it to be, and Isabelle stirred next to him. In the darkness he could see her eyes flutter open.

"Simon?" She said sleepily. "What time is it?"

Simon smiled at her and stroked her cheek gently, "It's late. Or early - go back to sleep."

Isabelle wasn't one to do as she was told though, she wriggled to a sitting position and leaned over to switch on the lamp, blinding the pair of them with the sudden bright light. Squinting at her boyfriend, Isabelle yawned and pushed her black mess of hair behind her ear. Her eyes flicked to the clock and back to him.

"Si, it's three in the morning, what are you doing awake?" She asked, "You've been so tired lately..."

Simon considered telling her about his nagging anxiety and the insomnia he was dealing with, but he knew that shadowhunters didn't really believe in that sort of stuff.

"I just can't sleep, it's okay."

Isabelle nibbled at her lip nervously, her dark brows furrowed together and even then, only just woken up and still half asleep, she looked so beautiful to Simon. Her eyes were serious as she studied Simon.

"You look worried, Simon." She shuffled closer to him, wrapping the duvet around them both. "Talk to me."

Simon couldn't help it but he was always so drawn to her, he had made a habit of always touching her in the smallest ways, in this instance it was to twirl a strand of her hair around his finger. He didn't really want to tell her about how he was struggling because that would mean she would feel guilty for being the one that talked him into it and he would never regret deciding to become a shadowhunter as it meant he could be with her.

"I'm okay, I promise you, it's just one night when I can't sleep."

Isabelle knew he was lying, he could tell, but she wasn't going to push it.

"If you can't sleep then I'll keep you company." She said, her voice gentle. "We've barely been spending any time together recently unless we're training."

Simon smiled and stroked her jaw bone with his finger, and then Isabelle took his hand in hers and kissed it softly. She proceeded to kiss up his arm and then his bare chest and then, his lips. It was a passionate kiss when she got to his lips, and the force of it made Simon fall back against the pillows, taking Isabelle with him. They both giggled quietly, like their laughs were whispers in the night. She made her way back down his body with her lips, as she moved down him she gently pushed his pyjama pants down, revealing his manhood. Even seeing her like that, kissing him desperately with her eyes sometimes squeezed shut but then flicking back to him, staring deeply into his mind, made him go hard.

"I love you, my beautiful Izzy." he said softly.

"I love you." She murmured, ducking her head to kiss the tip of his member.

"I love you." He said again.

She just smiled against his treasure* and then, opening her mouth, she began to suck it carefully and slowly, her eyes never leaving his. It was so lustful the way she did it like the way she did everything, it drove Simon crazy. As her head started to move faster and faster he couldn't help but groan, keeping eye contact with her the whole time.

"You're so beautiful." he breathed, "Isabelle, I'm going to come."

Isabelle smiled, still sucking, and she only removed her lips from him when he thought he was going to explode.

"Don't come yet," she whispered and giggled again, they were acting like they were scared of being caught despite them now living alone.

She rolled onto her back beside him and he immediately got the message, in his desperation to be inside her Simon moved quickly to hover over her. He inserted himself into her and she whimpered as he breached her entrance. Her hands clawed at his curls as he moved, his breath made her spine tingle as he buried his face into the pillow she lay her head on.

"I love you." He said again, mumbling into the pillow case. "I love you forever."

"I love you forever." Isabelle gasped, speaking the words as soon as Simon came, his juices now flowing inside of her. They didn't have to say anything else, Simon moved to the side and curled his body around her, smelling her hair and pulling her into his chest so that he could be as close to her as possible. He had the best sleep then, the best sleep that he had had for months.

*Yes I called it 'treasure'. It's hard to think of a way to say cock in a fluffy fanfic so that it doesn't seem too dirty XD This one is a bit shorter than my others but it's okay I hope! I'm not going to write anymore tonight as it is 1 in the morning now but hopefully I'll have more for you tomorrow... I'm thinking some Clizzy or maybe another gangbang? Let me know! Thanks for reading x