Sherlock;
Molly working at Bart's with you was both a blessing and a curse to the detective. For one, while Molly would give him whatever he needed with just a few sweet words, you needed the documentation, first, because there was no way in hell you were doing it. So that was his positive to the mousey pathologist working there. But, on the other hand, it meant he had to share your time. He didn't exactly know why it bothered him so much, though, he suspected it had to do with how he felt towards you.
"Morning, y/n-... and Molly..." He hesitated, and stopped when he saw Molly. Moving past his 'surprise' he continued onto see the corpse. He naturally chose to go to your side, and Molly seemed to ponder it only for a second, while you showed Sherlock what you'd found, not hiding the excitement from your voice. Wen you turned to look at him he had one of the few genuine smiles you'd seen if his, and, more to the point, was only centimeters away from you. And, of course, Molly just had to open her big mouth.
"You two would be really cute together." It sounded more like a reassurance than a gush, but she put on her best pretend smile afterwards... Not that it was very convincing. Fully disturbed, and embarrassed, you nodded to the pathologist and went back to the corpse.
"Thank you, Molly, I assure you, it's being taken into full consideration." Sherlock added, snarky tone and all. You couldn't help the small snort that came from you on Molly's behalf.

John;
A fellow doctor friend of yours went with you and John to grab a coffee over break. After ordering your complex latte order with, not one, not two, nor three, but five shots of espresso after a very late night, you rejoined your comrades at the small metal table, and immediately started gushing about Alex's crush on Aiden. John, lately, had only been reading to what page you got to, and never less either. He quipped back every time you spoke, clearly as invested in the teen novel as you were.
"But Aiden's a pure, y/n! It's like you want her to die!" He teased, laughing a bit about it at the end. You slapped him on the shoulder, but laughed right along with him.
"Hey! They're trying to change that law, so maybe they could be in love!" You fought back, adding a romanticized sigh at the end, being very comical with a dramatic swoon. John and your other coworker laughed. John didn't have a problem with the tag along, but he'd really been looking forward to spending the hour with you. And it was completely infuriating the way he looked into those passionate eyes, not tearing his gaze away. No. Those were supposed to be what only he got to see on these special days. He wanted to scream.
"You two would be one of the cutest couples ever, you know that?" He casually added, taking another drink from his coffee. You visibly froze, but soon began ranting again. John wasn't quite as invested, but still argued your every point. Maybe Nick wasn't so bad...

Mycroft;
Umm .... No, he doesn't share his time with you with anyone. It's not allowed. No ones even allowed to bother him when he's with you, and if they do, he'll send them to Kenya. He's made that very clear to all his employees. Plus, you don't get enough time with Mycroft as it is, why spoil it by adding some idiot?

Moriarty;
As Jim's best friend and personal body guard, Sebastian had practically insisted on meeting you. When Jim came around you were still watching YouTube, Jacksepticeye, to be exact. So, the three of you sat watching the green-haired Irishman send you on an emotional roller coaster through his Undertale Genocide run. Of course, neither you or Jim thought to tone down your playful flirting between the commercials.
"My god- HIS ACCENT THOUGH!" You practically screeched, clutching a hand over your heart as your legs laid limp over Jim's. He chuckled a bit, before collecting himself.
"Into Irishmen, hm? Think the accent is orgasmic?" He heavier it up to a nearly impossible degree, and you further clutched your heart.
"My god, yes!" Sending you both tumbling into a fit of laughter, and Jim only caught a glimpse of Sebastian giving him 'the look'. Ignoring the taller man, he settled down to watch the rest of the video. Sans battle. You couldn't contain the feels as Sans tried to stay strong, ending up as nothing more than dust.
"NOT YOU, SANS!" You cried, desperately clutching a pillow. Jim rubbed your leg sympathetically.
"Tsk. I know, my dear. He lived a pun-y life, that one." You smiled a tiny bit and nodded. Again, neither of you had noticed Sebastian was there, and that he was concentrated on the two of you.
"My god, just become a bloody couple already!" You can guess how embarrassing it was for Jim, but you just laughed it off, albeit a bit awkwardly, and started the next video. Sebastian got the death glare, until they got back to the car and he was full-on screaming at his sniper.