Hello everyone! This is my first Sherlock fic so please be nice. Also warning this is completely written on my phone and written in the middle of the night with little sleep. If you see any mistakes please tell me I would love to know.

Read and Review thank you!

Anyways I own nothing I just play around in the sandbox from time to time.

Could Be Dangerous

Chapter One

"Watson!"

John turned his head hearing his name being called from across the courtyard. He smiled softly as he saw his high school friend walking towards him. "Greg! How are you?" He asked once the other man was next to him.

"Good, tired was up doing homework all night." Greg answered before looking back at john smiling.

"It's only been a week since the semester started and you already behind? What the hell are you doing past the week?!" John asked laughing as he shook his as they walked slowly to accommodate john's limp.

"I've been doing my work! Have this one professor he's a hard ass. He has been assigning homework every day." Greg said shaking his head. "I swear sometimes I hate that I decided to go to Uni."

John clapped him on the shoulder. "I'm sure everything will get better and that he'll let up soon enough." He said and looked around watching other students rush about to get to class on time. "I'm not slowing you down am I?" He asked worried about making his friend late.

"No we are all good. Professor Holmes' class doesn't start for another 15 minutes." Greg said and smiled at john. "Why don't you sit in on the class? We can go out for lunch afterwards. I'm sure Holmes won't mind."

John frowned softly and looked towards the building they were walking towards. "I don't know Greg..." He said slowly and stopped at the look he got from his friend. He sighed and rolled his eyes. "Fine. I'll go. But only because I want to see if you actually work in you classes." He said and smirked at the happy grin he revived.

"You won't regret it I promise. Plus I bet your leg could do with a bit of a rest." Greg said as they entered the building. "I'll talk to Holmes and get him to agree you just stand by the door okay?" He said as they go to the lecture room.

John waved his hand in a 'yeah yeah' response as he looked over the room. 'Professor Holmes.' He thought as he looked over towards the board seeing neat handwriting of the days lecture. 'Must be older.' He thought to himself before he saw who Greg was talking to.

The man was tall lanky but overly so that it was awkward. His black hair was in disarray but his clothes looked expensive and tailored just for him. He watched as the man carefully unraveled his scarf from his neck and laid is on the desk as if it was a prized possession. Next thing he knew he was staring into blue eyes. Blue like the ocean after a tropic storm. So clear and perfect he nearly stopped breathing when they leaned on him. 'This might not be so bad after all.' His mind proved him as he looked the man over. 'Not gay...' He tried to remind himself even as his body was on the verge of betraying it's self while his mind already had.

Greg waved him over towards them and it took him a second to get his legs moving again. He walked to them slowly watching both of them closely. His training telling him to be care of people he didn't know. "Professor Holmes has agreed to let you sit in the class. Professor this is my friend John Watson. John, Professor Holmes" Greg said introducing them to each other.

John extended his hand out in greeting, his shirt sleeve raising up slightly. "Hello. Thank you for allowing me to do this I promise not to be a distraction." He said to the obviously younger man in front of him. 'How is he a professor? He's maybe 23.'

"Afghanistan or Iraq?"

Taken aback John instantly took a step away from the professor. "I'm sorry what?"

"Afghanistan or Iraq? Simple question." The professor said again watching John closely.

"Afghanistan... Wait how did you know I was..." John started to ask but was cut off when the professor turned away from him calling the class to order. Greg grabbed his shirt sleeve and pulled him to the back of the room. His thigh gave protest and shot pain down his leg as they walked as if the mention of Afghanistan made the wound worse.

"You okay?" Greg asked quietly as they sat down.

"Fine. I'm fine. Just a bit sore." John said trying to easy his friends worry as he looked to the front of the classroom. "How did he know? Did you tell him?"

"I would never do that. And I have no idea how he knows. He just sorta knows things about people just by looin' at them. Like on the first day of class he told me that I would make an excellent investigator one day though I have only told you that I wanted a job like that." He said looking towards the professor.

John gave a low hum and let Greg concentrate in the class. He even paid attention through most of it but his leg distracted him every so often.

He was in the British military for almost 9 years having signed up when he was 18. He did one tour or Iraq and two in Afghanistan. On his second tour to Afghanistan though his platoon was attacked and captured. It was two weeks before they made their escape mostly unharmed but as they escaped he was shot. He was honorably discharged. That was two months ago and by now he was mostly healed but his leg and shoulder still gave him pain.

"WRONG!"

His head jerked up quickly hearing the outburst and he stared at the professor.

"Wrong, wrong, wrong. Absolutely wrong. Look again and tell me what happened in these pictures." Professor Holmes said looking at the class as the student he had just told was wrong looked down quietly.

One picture was of a door the next of the kitchen small so it was flat not a house. There was broken glass all on the floor. The last was of a woman lying on the floor of a hallway bruising around her neck. Strangled.

John looked around the class seeing no one was answering, even Greg had his head down trying to not be noticeable.

"Come on this is simple even your little brains can see this!" Holmes said loudly trying to get even just one of his students to answer him.

John looked around again before raising his hand slowly.

"What is it Watson?" Holmes asked staring at him.

'Maybe this is a bad idea.' He thought before he started speaking. "She knew her attacker." He said staring back into the man eyes that made him nervous about his answer. He silently hoped he was right but if he was Erin that was okay to.

"Correct! Now tell me how you figured that out" Holmes said in an excited fashion as he waved to the screen for John to explain each picture.

"Well... The door was not splintered so not kicked in and there are no scratches in the lock so it wasn't picked. She opened the door and let him it. There is too much glass shared to be just one so she made him and herself a drink. There are no defensive wounds on her so she didn't fight him off, she was surprised he attacked her." He said explaining what he saw in the pictures to draw that conclusion.

"Very right Watson." Holmes said giving his approval before turning his attention back to the class. "You all should have seen that. He's not even in this class and caught it. You all should be ashamed." He said shaking his head. "I have posted several pictures of scenes like this on my website. I want you to choose three scenes and tell me what happened in each of them. It will due by next class. You all are dismissed."

All of the students started pain up there things slowly filing out of the classroom. "That was brilliant!" Greg said looking at john as he packed up his notes. "No one has been able to answer his question without him explaining it beforehand." He said to him and john smiled. "I'm glad to have impressed you. But it really was just all there..." John said shrugging.

"No. Mr. Lestrade is very right Watson. You noticed things that not many other would have seen." He heard behind in him and John turned around seeing Holmes leaning against the table in front of his and Greg's. "You did very well for someone who hasn't been in my class before. I look forward to the next time you decide to sit in." The other male said before walking off without another word.

John blinked watching as he gathered his stuff from his desk and left the room before he looked at Greg. Greg smiled at him light.

"So... Do you want to help me with my homework tonight?"