Addicted? No, of course not

One- Valentines day

[A/N] I know Valentine's day finished ages ago but I've been busy so I decided to do a VD themed chapter now instead. Sorry it's a bit late. This chapter will be a little bit smutty.
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Jace's hand shook slightly as he knocked on the door to Simon and Jordan's apartment for what felt like the 100th time. But this time, it felt different. It was Valentine's day which meant that Jace got bored of watching every couple in the institute get all 'lovey dovey' and kiss passionately in the halls. Frankly, Valentine's Day disgusted him. But this year, something was off. Jace had a sudden urge to see Simon. He presumed it was due to the fact he's addicted to Simon's venom. But, as he patiently waited for the door, a different emotion had risen up in him. He recognised this feeling slightly. He felt when he'd knocked on the door of Clary's bedroom the day they had kissed in the greenhouse. His stomach was fluttering, making him feel sick and his whole body was shaking. Was he.... nervous? "Jace?" Simon's voice cut through his thoughts, "Jace, are you okay?"

"Hmm? Yeah, I'm fine." Jace responded

"Okay then." Simon said, eyebrows creased in worry, "What do you want? Because I'd rather not bite you two days in a row. You know what I'm like, I just-"

"Simon!" Jace interrupted, "It's okay. I don't want you to bite me."

"Oh. Not to be rude, but, why are you here?"

"Can I not come and say hi to my friend?"

"We're friends?" Simon arched an eyebrow. Jace opened his mouth to say we're more than friends but hastily closed it again.

"I guess so." They just stared into each other's eyes for a second too long before Simon looked down at his feet.

"Do you- do you, uh, want to come in?" Simon gestured inside with his hands. Jace just nodded and slipped inside. He hung his jacket on the hanger next to the door and slipped his shoes off. He padded barefoot into the living room and collapsed onto the couch. He hadn't realised he had closed his eyes until he heard Simon's voice. "Long day?"

"You know it." Jace replied, opening his eyes and sitting up, "Everywhere I went there was someone either making out, having sex or just being generally disgusting."

"People had sex in front of you?"

"You'd be surprised." Simon sat down next to Jace with a huff, the couch dipping inward. Simon had really gained more muscle recently. Jace let his eyes wander to Simon's bare chest. The muscles were more defined and he most certainly had some impressive biceps. Jace's mind drifted towards what Simon could do to him with his biceps. He felt a recognisable strain in his groin so he pushed these thoughts away. He didn't want a boner in front of Simon

"Like what you see?" Jace jumped and realised he had been staring at Simon's abs for too long. He had noticed. Shit shit shit shit fucking shit Jace panicked. He felt his face getting warmer as Simon grinned at him.

"Shit." Jace whispered under his breath as he scrubbed a hand across his face

"So why did you really come here?" Jace relaxed. Simon thankfully didn't want to talk about what just happened. Jace pushed that awkward moment to the back of his mind for now

"Because I missed your excitable personality and stunning smile." Simon arched an eyebrow. Jace huffed. "Because it's Valentine's Day and I don't have anyone else. Plus, I missed your cheesy movies and stupid dad jokes." Jace said exasperatedly. Simon chuckled

"I never thought I'd see the day." Simon was grinning like a maniac

"What?"

"I got to you. I actually penetrated through that tough shell of a noggin." Simon said, laughing hysterically.

"What's so funny about that?"

"Nothing, nothing. I just can't believe this is actually happening." Simon replied when he got his breath back. I'm such a fucking dick Jace realised with a start. He sank back into the cushions behind him. "Hey, are you okay?" Jace sighed

"Yeah."

"Are you sure?" Jace arched an eyebrow, "I'm serious. If there's anything you need to talk about, even those disgusting monthly orgies." Jace smirked. Simon knew him well

"Orgies? Me? Never." Jace replied sarcastically

"Jace."

"What?" Simon raised his eyebrows. Jace huffed, "Look, Simon. I appreciate the sentiment bu- " Jace was cut of by Simon's lips crashing into his. He hesitated. Simon pulled away and covered his mouth with his hands, eyes wide.

"Oh my g- " Simon huffed "I am so sorry. I know that you aren't gay and I'm pan and I couldn't resist, like really couldn't- " Simon was cut of by Jace's soft lips back on his. Simon paused a for a second before returning the kiss passionately, Jace's hand reaching up to cup the back of his head. Jace felt Simon's fingers graze his jaw and he shivered involuntarily. He pulled Simon on top of him and laid back into the couch. Simon bit Jace's lip and he gasped in surprise. Simon slid his tongue into his mouth and he groaned. Simon pulled away

"Touch me." Simon gasped. Jace paused for a second before nodding. He let his fingers roam the expanse of Simon's back, silently celebrating when he shivered and kissed Jace harder. Jace bucked his hips up to meet Simon's, making the latter tear Jace's shirt down the middle. He pulled away to stare at the vampire in astonishment, golden eyes wide. "Sorry." Simon mumbled, blushing.

"You have no idea how hot that was." Jace said, slightly breathless. He flipped them over so that Simon was now on the bottom and peeled the remains of his shirt off his body. He leaned down, feeling Simon's bare torso on his. His kissed along the line of Simon's jaw, bit a trail of marks down his neck, licked his collarbone and kissed his way back back up again. Simon was writhing beneath him and delicious gasps and moans were spilling from his swollen lips.

"And I thought I was the vampire," Simon commented breathlessly. Jace winked. He sat up again, straddling Simon's hips. He grazed his fingers around the soft skin just above the line of Simon's jeans and the vampire gasped. Jace smirked. "Just-just Please loose the fucking jeans." He knew that he had full control now, that Simon trusted him to provide pleasure. Jace snapped Simon's belt buckle open and slowly pulled the jeans off his body. "Your turn," Simon panted. So Jace slid off Simon's torso and stood in front of him. He slowly dragged his jeans down his legs and kicked them off. He sat down on Simon's waist again. He smirked when Simon's fingers snaked up his thighs and reached to cup the back of his legs. He actually liked the feeling. Male hands were warm and large. But Jace isn't gay right? Or was he? He jumped when Simon's fingers found the waistband on his underwear. The vampire started to slide them down Jace's legs. His eyes widened when he'd slid them down enough to see his- "Wow." Jace chuckled and Simon moaned. Obviously he had chosen the right place to sit. Jace moved his legs a little so that Simon could slide his underwear off his legs before returning to his original position. He felt Simon's eyes on him like fire. Everywhere his glazed eyes gazed felt hot. Simon's fangs snapped out and Jace felt a tightening in his groin

"Like what you see?" Jace teased

"Definitely." Simon breathed before removing his own boxers. Simon jerked his hips up and Jace felt pleasure spark through his body. He bit his lip, he couldn't loose control just yet...

[A/N] Sorry to disappoint but this is the end of the chapter. I'm sorry it took so long. I made this one a longer chapter to make up for the long break. But, I hope you enjoyed it anyway. This is my first time writing smut so please try to be nice. Also, Jace and Simon will switch in between being the top and the bottom because I don't believe in stereotypes. Happy reading ;)