Molly's face broke into an unconscious grin as she rounded the corner to come face to face with Sherlock and John. Sometimes she wondered whether she would ever get over her joy at having him back in her life.
Her smile reflected in his eyes and she had to remind herself to breathe, "I was just on my way to get a coffee, would you like some?" she asked.
"Coffee would be great, thanks Molly," John told her with a smile, shooting a curious glance at his silent companion.
"We'll be in the morgue," Sherlock added as they continued on their way, she nodded in acknowledgement as she hurried off, missing him turn slightly to watch her go.
A few minutes later, Molly returned to the morgue to find John sitting off to the side, absently texting someone, whilst Sherlock worked on the microscope.
After handing John his coffee, Molly carefully placed Sherlock's within arm's reach and moved to take her own back to her desk. John stopped her with a hand on her elbow.
"You'd better swap them before he notices," John whispered to her.
Molly's brow creased in confusion, until she looked down at the mug in her hand and realised what she'd done.
"I didn't-it…I-" she stammered, looking back desperately to the mug in question.
"What are you two whispering about?" Sherlock huffed, turning away from the microscope and picking up his coffee, "It's distracting."
"Obviously," John quipped, "you're coffee's wrong and you didn't even notice," he continued, shooting Molly an apologetic look but deeming it better Sherlock knew before he took a sip.
Sherlock froze with the mug halfway to his mouth and looked down: white, no sugar. His eyes flicked up to Molly, who had turned pink and was chewing her bottom lip as she looked down at her own mug with a hint of guilt. He knew without even looking what she held in her hands: black, two sugars.
She looked up and their eyes met.
He resisted the urge to look away, knowing that she would be able to see as easily through him as he could her. When Molly's eyes widened he knew she'd figured it out.
John cleared his throat, breaking the moment, "It's a coffee order, it's not like it's the end of the world," he told them. When neither of them moved, John sighed and swapped the mugs over himself. "There, see? It never happened," he said, returning to his seat and picking up his phone.
Despite being grateful in this instance, Sherlock couldn't help being a little amused that John had once again seen without observing. He and Molly hadn't noticed that they had the wrong drinks not because they were distracted, but because they had both gotten used to drinking the other's preference.
He shared an amused look with Molly, silently saluting her with his coffee. She bit back a nervous giggle, looking a little unsure of herself, as she did the same before continuing on her way to her desk.
Sherlock took a sip of his coffee as he watched her leave; yes, he decided, he definitely needed to talk to her.