The rest of the week went on quickly, Harry's lessons in History of Magic were done for the week so she could focus on helping Sherlock and John. There were a lot of questions and the answers Harry gave only resulted into more questions. John and Sherlock spent all their times in the library with quick breaks for breakfast, lunch, dinner and some sleep. Harry could almost swear that Sherlock even slept in the library but the man always left his room when she had to go to the morning staff meeting. Harry helped with their learning as much as she could but she had her teacher duty's to do so she wasn't as much present as she wanted. This went on for three days until she had to work late one day, she was patrolling the corridors to look for student out of bed when she saw it, there was a soft light coming from the library. She quickly walked towards it to scold the offending student and retract a lot of points when she saw which part of the library the lantern light was coming from. The light was positioned in the forbidden section and she saw someone walking along the rows of books. Harry sneaked closer on quiet feet to investigate and she discovered no other than Sherlock browsing through the books. "You better have a good reason for being here Sherlock." She said and the man in question jumped somewhat in shock.

"Ehm-, uh-, Hariel, I didn't expect to see you here." The man said flabbergasted and Harry was quite astonished to see the man at a loss for words.

"Get your arse over here Sherlock, it is named the forbidden section for a reason." Harry said in a stern tone, she almost felt like Minerva in this moment and she had the urge to give sherlock quite the scolding.

"I was just resuming my research from the other day." Sherlock tried to explain.,

"I never brought you in here Sherlock, and the rules of the headmistress were clear. You are only allowed in there with me present," Harry said with a meaningful look, "does this mean that you have been in here the last few days?"

"I can neither confirm or deny that fact." Sherlock stated.

"Of course," Harry said with a sigh, "Lets just get back to bed, I'm tired and the defence against the dark arts lessons start tomorrow. We best get some sleep before it is to late." Sherlock nodded and put the books back were he found them.

The next day started early and breakfast was a blur, Harry normally didn't mind the early mornings but she definitely needed coffee right now so she wouldn't snap at her friends. The three of them walked towards the classroom in silence, this silence was shattered with the first steps they set in the classroom. The students were already present but also all over the place, most of them were talking loudly to each other but some were running around the classroom. Harry sighed and made herself present by walking to the front of the room with Sherlock and John following her. The students calmed down and Harry noticed Ethan Longbottom sitting in the front row. They were fourth year students and Harry had a special lesson planned for them, one she had gotten a long time ago herself when she was their age. She reached the front of the room and stood next to a large and old looking cabinet, she turned to look at the class when the cabinet shook somewhat as if something was trapped inside it. Sherlock and John looked startled while the class muttered amongst themselves. "Good morning class, I have a special lesson planned for you all today." Harry began, "Who amongst you knows what a boggart is?" Ethan was the first to put up his hand and Harry pointed him out.

"A boggart is a creacher that takes the form of the thing you fear most." Ethan answered.

"Well said, five points for Ravenclaw. Boggarts are amortal, this means that they were never alive to begin with so they can't die, it's a non-being. No one knows what a boggart really looks like because it takes the shape of the thing you fear most. The boggart has one weakness and that weakness is laughter." Harry explained, she went on to teach the class how to use the riddikulus charm while Sherlock and John kept looking at the cabinet besides Harry.

"Now," Harry began after all the explanations, "You all have noticed this cabinet and most of you must have figured out that a boggart resides inside it. I want you all to focus on your worst fear and then turn it in something comical so we can practice the spell."

The students were talking amongst themselves to discuss what each of them should do when Harry took Sherlock and John aside and out of earshot of the class. She shot a look at the children to make sure they couldn't overhear them. "You two need to stay away from that boggart, you don't have any protection from it and I don't need Moriarty to step out of that cabinet." She said with a stern look.

"It can do that?" John asked

"Yes it can, and you two can't cast a spell to protect yourself from it. Just observe but don't get cocky, I don't want to explain your fears to the class."

John and Sherlock nodded and Harry smiled at them. "This will be a fun lesson for the kids, I remember the first time my class faced a boggart." Harry said and trailed off at the thought of Snape in a dress, it was still a funny sight to remember.

"You had this lesson too?" Sherlock asked.

"Yes, the best friend of my father taught it even though I didn't know he had known my parents at the time. That year was kind of confusing." Harry mused.

"How so?" John asked.

"Well, my godfather had escaped from the most dangerous prison in the magical world. He was another of my father's best friends and he came to Hogwarts to kill the third friend who had betrayed my parents, he was the rat of my best friend."

"A rat?"

"Oh, that isn't weird at all. My father could change into a stag." Harry said in a matter of fact tone.

John and Sherlock looked at each other and John gave a shrug, as if to say: it's magic mate, what can you do about it?

The class had discussed their fears and were standing in a line before the cabinet, Harry stood at the back of the line to make sure the boggart wouldn't take the form of a dementor, that would be quite problematic. The first student stepped forward and the cabinet shook a few times before the doors slammed open and the first fear stepped in front of them. It was a clown, not very original but still logical. The student trembled a little when he saw the clown in front of him but he quickly casted the spell. The clown's nose swelled and swelled until it burst with a pop, the whole class was laughing and the boggart stumbled back a little.

"Alright, next in line." Harry called above the laughter and the students followed her orders. The next twenty minutes was full of laughter and antics as the students became more and more creative with their solutions to their fears. Harry saw the obvious spider that was turned into a bouncing ball and the snake with a knot in his body. The class was enjoying itself and Harry turned to look at John who was apparently studying her with a little frown on his face. Harry walked over to him "What is wrong captain?" Harry said with a little smile.

John smiled back at the sound of his rank from his army days. "I noticed that you keep away from that boggart just as much as me. Why do that?" He asked

"My biggest fear isn't something to share with fourth year students." Harry answered.

"Is is Voldemort?"

"No, my biggest fear is fear itself."

"How does that work?"

"You will see in the next period, I will teach some seventh year students then."

John nodded but didn't understand fully but he knew his questions would be answered in due time. Then he noticed that Sherlock wasn't standing next to him anymore, he looked around for his friend and froze. Sherlock was almost standing in front of the cabinet behind a student who was casting his spell over the boggart. The student laughed at his rendition of his mummy, it had stumbled backward into the cabinet when he made it trip over it's own bonds. The student walked away from the line which left Sherlock in front of the cabinet.

John watched in horror as he saw a hand emerge from the darkness in the cabinet, it was a normal hand but there was a certain vibe about it. The class went silent and Harry looked over only to see a man in a suit walk out of the closet, but it wasn't just some man, it was Sherlock. There was something wrong though, Sherlock looked at his boggart with a frown. Then it began to talk and everything made sense.

"You are wondering who I am, aren't you?" The fake Sherlock asked but his voice was high and full of glee, nothing like the bored tone of Sherlock's voice. The detective had put two and two together and was staring at his biggest fear, that was the moment Harry saw it too. She had seen that sort of body language before and it was quite obvious. The fake Sherlock was wearing a Westwood suit with a shit eating grin to match, the tone of the voice and the vibe made sense. Sherlock's biggest fear was turning into Moriarty and it was awful to see it, the boggart looked like a cold and broken version of her friend the detective.

John acted before Harry could, she was still shocked to see such a cold side of her friend but John shook if off and ran towards his friend. Sherlock was frozen, he didn't look scared exactly but there was a spark in his eyes that spoke of the unexpected. He hadn't expected this turn of events but now that he saw it, it made sense. John reached Sherlock's side and pushed him out of the way as if to shield Sherlock from his own shadow. This wasn't the best course of action and Harry could tell that he hadn't thought it through. She made to run at him but froze at the same time as John did.

The boggart was changing again with a bang, suddenly there was the smell of blood in the room as a corpse lay on the ground. John stared at Sherlock as he lay dead before him in a puddle of his own blood, his body was broken and his eyes stared at nothing. John stumbled a step backwards as he looked at his dead friend. John's face was full of pain as he looked on, shaking his head as if denial could make the vision go away, Harry made a small sound of pain but she regretted it instantly.
The sound made John focus on her voice and the boggart changed again, this time it wasn't made up, this time the boggart changed into a memory. It was still a corpse, Harry's corpse. It lay there with the same staring eyes Sherlock's corpse had, the bullet holes in her neck and shoulder were prominent as a pool of blood gathered beneath her corpse. John was now ashen with shock and couldn't walk away, the only thing he could do is shake his head and constantly mutter the words "No" and "Not again" as he saw her lying there.

This was the time when Harry finally snapped into action, she marched towards her friends and glared at the boggart. She cast the spell over the boggart and the spell was so powerful that it didn't even change form into something funny, the boggart was blasted back into the cabinet and she locked it with a flick of her wand. Harry didn't even give a second glance at it and quickly turned around to look at her friends. Sherlock stood next to John but was mostly fine, he was more shocked about John's boggart than by his own. John was still staring at the ground where both of his friend's corpses laid just a few second before.

"John?" Harry asked but there was no reaction from him. "John?" she asked again but she couldn't make contact with the man before her. She grabbed John with both hands, his face between her hands and she forced him to look her in the eyes. "Sherlock lives and I am not dead John. I am much harder to kill than that and Moriarty can try all he wants but I am to stubborn to die, I always was to stubborn." Harry insisted and she seemed to have gotten through to him.

"But you… It was so real…" John sputtered.

"Your fears always seem so real, until you face them. They will always exist but you can learn to live with them."

John nodded weakly and Harry let his face go and turned to the students. They had seen and heard everything and were now looking at their teachers with a different look, a look that showed respect.

"Class is dismissed, go have lunch early." Harry said and the students flowed out of the room after her dismissal.

"Moriarty can still kill you." John said when the students were gone.

Harry sighed and looked at her friends, "He can… but there are just a few ways in which I can truly die."

"What if he figures them out?" John asked in a slightly higher voice than normal.

"I doubt it John, I know only one way in which I can die and that is when I give up being master of Death."

"But there are other ways?" Sherlock asked.

"There are, Death knows a few but physical harm can't kill me as far as I know."

"What if he decides to behead you, or tries to blow you up?" John asked franticly as he was still upset to see her corpse lying on the ground.

"I will survive both of those things, it will take longer than normal but I will live." Harry said in a calm tone.

John sighed in a defeated tone and sat down heavily on one of the benches the students normally sit on. "I just-" He began but stopped before he could finish the sentence. He began again a minute later after he had rethought his statement, "I can't bare the thought of you two dead, especially you Harry." He looked up at his two friends and saw their looks of concern. "I have lost so many of my friends when I was in the army and I would have thought I was used to it but just the thought of you two dead in front of me makes me nauseous."

"We would never expect you to get over that fear John." Sherlock said as he patted John's shoulder in a rare act of compassion.

"You were in the army John," Harry said as she put her hand of his other shoulder. "This means you have fought for your friends around you."

John chuckled, "Most people would say that I have fought for my country." He said.

"Most people are stupid." Sherlock said with a smirk.

"He is right," Harry said, "You might have gone there for your country but you fought with your friends. I can tell from experience that those friends were more important than your country ever was."

John looked up at Harry, he had forgotten how she had fought too. She had saved the world but he could see now that the world wasn't as important to her than her friends had been. He could see her tear the world apart to keep the ones close to her safe. She was truly a woman to be reckoned with. Then he looked at Sherlock and he could see the worry in his eyes even though the man tried to hide it and he could see him do everything he could for John without asking anything in return.

He smiled to himself as he looked at the two in font of him and thanked the heavens that he could call those two extraordinary people his friends, he would do anything in his power to keep those two safe.