Sherlock Imagines

Bestfriends. (MoriartyxReader)

Prompt: 38 ("How Can I hate them? You're the one that made the choice to cheat.")
Character: Moriarty or Sherlock (I just see Jim as more likely to cheat on his s/o)
Requested by: @HeroesOfOlympus287
A/N: THIS IS WAY WAY WAYYY OVERDO. IM SO SORRY.

The day had been just complete crap. You just needed to go over to your best friend's house, and talk crap about your coworkers. Besides, you were too upset with Jim to talk to him, and really didn't want to deal with him basically ignoring you. You loved the man, but sometimes he was much too much caught up in Sherlock Holmes and in work.
Snowflakes drifted down, kissing your skin with soft and purposeful movements. Taking out the spare key to her flat, you paused, feeling something was off. It didn't take long to figure out—a sleek, black car that was much too expensive for an area like this, and...it looked a lot like Jim's...
You circled the vehicle, looking closely at the driver's door and quickly finding what you were looking for. It was a small scratch, and Jim had paid to have it well covered, but you could still see it if you knew it was there. You frowned deeply, but shook it off. He probably had business in the area, it wasn't unusual to see the car in any part of town.
So, you returned to Molly's door, needing the relief of a nice cuppa and some time with your friend.

You shouldn't be here, his mind supplied unhelpfully. You shouldn't be with her, you'll get caught.
No, he wouldn't let that happen. This wasn't anything personal, it didn't mean a thing, it was just business. Even if y/n did find out, there was nothing really going on here. They would understand.
...right?
Will the five seconds you get to tease Sherlock Holmes be worth it?
"Jim?" The mouse of a woman pulled him from his thoughts, as she had seemingly caught on to his hesitation. It would play up the 'gay' angle, at least. But that was for later. He flashed her his most charming smile, kissing her sweetly as his hands roamed up her sides. Christ, this felt like being an inexperienced teenager...well, he supposed that fit Molly rather well, except for the teenager part.
"Right, Sorry, I got a little nervous," He excised smoothly, causing her to blush.
"No, it's fine..." She was so meek and timid, he could understand why she was trapped having a crush on a sociopathic detective. Pretty, but boring.
Even so, he went back to kissing her, only stopping when Molly's front door opened, shock settling in to them both.

"Oh—Christ, sorry, Molly, I didn't mean to interrupt or any—" your eyes settled onto the familiar black hair, which wasn't nearly as styled as it usually was, glancing over the thing stripes scarred onto his back. That absolute fucker.
"I'll leave you two alone," Your voice fell flat as your head spun in a thousand directions, ice overtaking your chest as you quickly hurried down the street. A part of you hoped he would follow you, at least try to fix this...you kept your pace slow, but he never came. You dialed Sebastian's number to have him pick you up, jaw locking into place the moment he picked up. You wouldn't let him see how this effected you, because he was certain to tell Jim. As sick as he was, he'd probably do anything in his power to make you feel worse.

"Car for y/n?" He grinned as he pulled up, rolling the window down. You smiled kindly, nodding as you climbed in next to the sniper.
"So, tell me, what's the partner of the world's most dangerous criminal doing way out here all alone?" He asked wryly, the question making your eyes burn with fresh pain. He doesn't know. He doesn't mean it.
"I was visiting a friend, and then finding out I'm being cheated on and lied to, so nothing unusual." The sudden slam on the brakes through you towards the windshield, but you recovered quickly.
"What?!"

To your surprise, Sebastian was acting a lot more loyal to you than to his boss and best friend. He made you tea so you could explain what happened (without giving any indication of how much it hurt), and even helped you start packing your bags. The only thing you could imagine being worse than discovering Jim's affair, would be to stay afterwards. It took an entire hour to here the sound of the door opening and shutting, with hurried steps rushing towards your room. No, his room. Just his.
"Y/n..? Look, I'm sorry that you had to see that, but you shouldn't hate Molly or anything, there's a perfectly reasonable explanation for—what are you doing?" He only seemed to now notice the cases being filled. Sebastian didn't give him the respect of pausing, just continued to pack.
"Jim, how can you possibly expect something like that?" You scoffed, noting that his ego probably told him that he wouldn't be losing either life today, "How can I hate Molly? You're the one that made the choice to cheat, she doesn't even know that we're together." You rolled your eyes, shoving more clothes into the bag. His throat tightened, every nerve in his body throwing itself into panic mode.
"No-! You don't understand, that is not what it looked like!"
"It looked like you were fucking my best friend on her sofa," You crosses your arms over your chest, raising a brow at him. His jaw clenched and he made a noise of struggle.
"Okay, so it is exactly what it looked like, but I have an explanation that'll fix it—"
"And I don't care enough to hear it."
"I'm just using her to get to Sherlock—it means nothing!"
Your eyes lit up with anger, jaw locking as you slammed your case shut, "So, let me get this straight—"
You're dead, James.
"You cheated on me with my best friend," He took a half-step back as you took one towards him, "played with her heart," your voice was sharp as you quickly closed the distance between you both, "and you think the involvement of your obsession excuses this!?" Your palm cracked across his jaw, making a sound so ear-piercing and sharp that even Sebastian winced.
"If you ever step foot into my life again, James Moriarty, I will kill you. That's a promise." And terrifying as fuck coming from someone who had dedicated their life to saving lives. He nodded sheepishly, staring at you in abject horror.
"Help me get my bags to the car, Seb?" He nodded in affirmation, licking two up as you grabbed the third. He still didn't look at Jim as he passed.
No one even seemed to notice the tear sliding down his bruising cheek.