Kiss Ten: (Time: 4 pm)

Sherlock noticed another person in the brownstone as soon as he approached the door.

He slowly unlocked it and pushed it open, laughter flooding out of the residence as the door was swung open.

It was Joan and... a man's laughter.

Sherlock slammed the door shut. He walked in, the living room becoming silent upon his entrance.

Joan sat on the couch, and next to her was a...colleague? No, too close for that. At least a friend. Probably more.

Sherlock felt a weird twist in his stomach as that thought played in his mind. Something... more? Was I not adequate enough for her to be in search of another man? But last night... He smiled at the memory of waking up next to Joan, her listening to his heartbeat as Sherlock absentmindedly stroked her hair.

Joan glanced at Sherlock with a grin.

"Sherlock! This is-"

"Mark Morstan," he cut in. Mark stuck out his hand, waiting for it to be shaken by Sherlock. It wasn't.

Mark coolly brought his hand back and combed it through his hair- fixed it for a special occasion- as he said, "So, you're the famous 'Sherlock Holmes'. Heard a lot about you from Joanie here."

She blushed and elbowed Mark as she stuttered, "I didn't talk about you that much. I just said some things here and there..."

Mark laughed as he draped his arm around her and pulled her even closer.

"I think Joanie here has got a little crush."

Sherlock's gaze snapped to him, and then flickered to Joan. Her turned face was all he needed to look at to know. Joan didn't need to tell him.

He got mad –or maybe it was the jealous side of him taking over- and did something irrational.

Sherlock pulled Joan off of the couch, wrapped an arm tightly around her waist, and gave her a hot, passionate kiss. When they broke free, Mark looked uncomfortable and Joan was flustered. Sherlock was smug, as always.

"Watson's crush is reciprocated."

Mark rubbed the back of his neck as he muttered, "I didn't know you were dating someone."

Sherlock smirked.

"... But! Still doesn't mean I can't take you out to dinner," he finished. Mark gave his most charming smile, which made Sherlock want to rip him in half.

Joan gazed at Sherlock, asking him a silent 'Are you okay with this?'

He tightened his jaw, and huffed out a small 'whatever' before storming upstairs.

She made a move to go up to Sherlock, but a hand on her shoulder stopped her.

"He'll be fine," Mark said offhandedly, "let's just go."

After one final glance to the second floor, Joan followed Mark out of the front door.

o0o

Sherlock heard the door slam shut.

"She left," he stated to no one.

"Of course she left, you bloody idiot. You gave her permission to," Sherlock retorted to himself.

He sat down on the bed and covered his face with his hands.

"Bloody idiot."

A/N: Oh my gosh guys I am really sorry! This is so late...