"Hey, don't cry. Crying won't solve anything. Actually it's not as hard as you imagine. You only need to satisfy my three conditions and then I will promise you that I won't tell anyone about you being a half demon."
"What are they?" Erza expected very harsh conditions. She had a heavy expression on her face.
"The first one is you need to tell me everything about yourself. I should always know what you are up to, no lying or hiding anything."
"The second condition is you have to follow everything that I say, even if it's against your will. If I say to kill someone, then you just need to kill that person. No question should be asked."
Erza forehead was full of black lines. As expected, his conditions were very harsh. If she accepted those conditions, she would lose her privacy and freedom. She would basically become his servant. Even if he asked her to warm his bed in the future, she would need to obey. Still, she controlled herself and waited until Beel finished with all of his three conditions.
"The last one is quite simple. You just need to call me Big Brother going forward."
"Is it all clear? Are you able to accept all of those three conditions and make a Blood Oath?" Beel concluded his conditions.
Erza shuddered. Blood Oath! It was a very serious oath one could make. The person would be consumed by his own blood if he broke his oath. In other words, he would die.
"Can we put a time limit on those conditions? Let's say until my graduation day from the academy?" Erza braved herself to start negotiating the terms with Beel.
"Your graduation day? Hmm… Fine!" Beel thought for a while before he agreed with her proposal. To be honest, he did not expect Erza to agree at all. He thought that Erza would beg him to reconsider his conditions. After all, the first two were very harsh.
"Also, for the second condition, your requests must not bring harms to those whom I love. Of course, warming your bed is also out of question. I would like to keep my purity intact. My first time has to be with someone I love."
"Deal." Beel was amused.
"Deal." Erza sighed heavily. She then swore the blood oath to obey Beel's three conditions, added with her own terms, for the following years until the day she graduated from the academy.
Beel laughed inwardly as he saw her making the blood oath.
"It must feel good to deceive a clueless girl, huh?" A stern middle-aged man voice reverberating in Beel's mind.
"Dad!" Beel shuddered. He forgot that his father would always know what was happening inside this room. The grand formation would definitely prevent an outsider to know what was happening in the room, even if he was a God. However, it was a different story when it came to the creator.
"I won't disturb your play. But remember, you must protect her well. She is such a poor girl and she would face even tougher times as she grows older. Unlike you, she grew up with the absence of her parents presence."
"I know. Trust me, Dad."
"Good. Take a good care of her. Be nice." Beel sighed in relief. He thought his father was done with his talking.
"Oh by the way, I won't forget that you have made her cry. I will teach you a lesson on her behalf when you are home." The voice then completely disappeared from Beel's mind.
As for Beel, he just stood there with a hopeless smile on his face. Looked like he would have to avoid going back home for a short while.
"Big Brother!" Erza gritted her teeth. Soon, Beel was back to his cheerful self.
"Aawww.. My cute little sister." Beel teased her. Erza could only bear with her shame.
"Now, let's start with the practice. Take out your Cloak of Aztaroth and wear it on yourself." Beel said seriously. Erza followed his instructions and wore the cloak.
"Good. Now start applying your demonic power to the cloak."
"Do you feel anything?" Beel asked. Erza shook her head. She really did not feel any difference other than the cloak was taking her demonic power bit by bit.
"Take out a mirror and look if you could see yourself."
Erza then took out a mirror and she was surprised that she could not see herself! "Is this…?"
"Yes, Cloak of Aztaroth would hide its user presence. In fact, currently, I could not see or detect your presence at all." Erza was pleasantly surprised with his answer. She was invisible!
She then put a great strength to her fist and punched Beel in the stomach. Beel truly did not see it coming. He was sent flying few metres away, crouching on the floor, coughing in pain.
Before waiting for him to explode, Erza quickly spoke "It's truly as you said. Don't get angry. Consider it as a love punch from your cute little sister." She did not forget to emphasize on the words 'love punch' and 'your cute little sister'. Erza felt better after letting out some of her anger.
"Fine." Beel gritted his teeth.
"So, how good is the cloak in hiding my presence?"
"Very good. It would hide your presence from those experts on a higher realm than you. Let's say, currently you are a knight, then the cloak would be able to hide your presence from those King realm experts. The stronger you become, the stronger its effect."
"Is that mean when I reach the Saint realm, even a God would not be able to notice my presence?"
"Yes." Erza was thoroughly stunned. What an overpowered treasure!
"Don't need to be surprised. This cloak was the best treasure of Aztaroth. Using this cloak, Aztaroth managed to reign in terror for countless ages. He killed his enemies without them knowing who was the killer."
"In fact, during the First Realms War, all human leaders had to join forces together and forced Aztaroth into a trap before managed to kill him. They were all afraid of him."
"It was funny that they did not know that the cloak was the main cause and treated it as a trash. You are very lucky to obtain it. But you also need to be careful. Don't let the devils and the demons know that you possess the cloak. They will surely hunt you down to the end of the world."
"How do you know all of these?" Erza was amazed with his knowledge.
"I read a lot."
Erza just snorted in return. She was not a fool.
"Enough with the chitchat. You better start to familiarize yourself with the cloak. Try to move around with it and make your attacks. I'll be here if you have any question. Of course, do not make me as your practice target."
Erza was disappointed to hear the last part but she knew that she better did not go overboard. Both youths then decided to skip their lunch and dinner, each focusing on their own practices.
Without him knowing it, Erza was actually taking a peek at Beel ripped muscles. She was very shy at first but she still did it in the end because she knew that Beel would not notice it. Beel was shirtless as he was practicing his movement skills. He did not want his shirt got wet.
"Are you planning to practice until the dawn or you want some rest? Need a room?" Beel suddenly asked Erza.
"Do you know the way to Seven Colour Pagoda clan from here?"
"I know. Why?"