Okay back to this story, the way I've been updating I feel like it is being done in order of which story I like best it really is infrequent and for that I apologise it is also partly due to having a plan for the next chapter and then forget what it was as is for a few of my stories, there's that and a constant stream of new ideas I want to write about. Anyway hope you enjoy this chapter
Natsu had a great time with the Rose family, it may have only been a short dinner party sort of thing and lasted to around 7pm but he still had a great time with the family "Natsu do you really aweehave to go?" Alexa asked tiredly as she rubbed her eyes while clutching a teddy that she decided was her favourite from the bundle Natsu gave her. "Sorry Alexa but if I stay any longer I probably won't end up leaving to really late plus I have school tomorrow but don't worry we more or less live in the same neighbourhood I'm sure we'll see each other soon kay?" Natsu said while patting the child on the head causing her to pout. "See tomorrow at school Yuki" Natsu waved at the girl as he walked his way home, surprisingly the sun had yet to fully set.
Natsu was almost all the way back to his place when he picked up a familiar scent "Yuuma" the slayer grew suspicious and began to follow it but decided it would be better to conceal his presence. Using his advanced senses Natsu could make out the figure of Yuuma standing near a fountain in front of a brown haired kid that was around the same as himself he couldn't exactly make out what they were saying but then he heard the words "would you die for me" come out of Yuuma's mouth before she jumped and was enveloped in a purple light that when faded revealed a very different woman, Yuuma's hair was longer her eyes were darker, she was taller his breasts and thighs were larger and she had a pair of black feathery wings.
Natsu then acted on instinct and charged right in when he saw Yuuma fly up into the sky with what appeared to be a spear made of light in her hand. "YUUMA!" was all the brown haired guy heard before he felt immense pain in stomach as he turned around to the source before blacking out unable to see the cause. The cause was Natsu's fist who was unaware of how fragile people's bodies were here and how he hit him which he only noticed from the blood that was leaking from the side of his mouth.
"Natsu?" 'Yuuma' froze at the sound of his voice and further more at his appearance, the way he was looking at her it almost made her want to die "Tell 'Yuuma' who are you really?" Natsu asked in a neutral tone but the piercing glare in his eyes had a completely different tone to them. "My name isn't Yuuma, my name is Rayanare…" "Rayanare Yuuma, I don't care what your name is I want to know who you really are." Natsu interrupted this time his voice just a tad more serious as he noticed multiple magical signatures appear around similar to the other although nothing to worry about because none were above what would considered a C-class mage.
"I'm a fallen Angel, an angel who fell from heaven for doing something they shouldn't have, I simply want back into heaven and I have been tasked with the mission to observe two individuals who could prove to be problems in the future. So I will use my judgement and determine whether I shall simply observe the induvial or remove them, this boy is one such individual and he will be removed although it appears you already did a number on him" Rayanare replied in a calm tone although her eyes weren't hiding how she felt.
"And you think you can take his life so easily because to me it doesn't look like you want" Natsu replied in a dead neutral voice causing Rayanare to flinch, "How's he doing this to me, he's just human" "You don't know what it like, I didn't deserve this I did nothing wrong!" she screamed in a frightened voice before aimlessly throwing a light spear which Natsu didn't even attempt to dodge knowing it was going to miss.
"I take it was one of your targets then as well?" Natsu asked in the same neutral tone before he paused "does that mean that the day we spent together was a bunch of lies, that everything we did together was fake, were all the memories we made together fake? Was the smile on your face fake huh Rayanare?" Natsu the continued to ask in a more serious tone this time causing the now known fallen angel to tear up a bit "no but I don't a choice or I'll die" she could only whisper to herself in response but it was still loud enough for his advanced hearing to pick up, Natsu knew the tone of is voice sounded harsh and it isn't exactly how he wanted it to come across but right know he was angry, someone was forcing her to do this at the cost of her life if she fails and Natsu would make the bastard pay when he found out who.
"Cause they sure as hell weren't fake for me" Natsu said with a grin while pointing to himself, before anyone could do anything else they all noticed a large red circle glow with what had the Gremory family crest on which caused Natsu to notice that Rayanare and all the other magical signatures had fled. Natsu looked down towards the brown haired teen he had punched and saw that he may have indeed punched him harder than anticipated but if this was a member of the Gremory household the kid should be fine, so albeit reluctantly before he was accused of something Natsu took off and left the scene without a trace of there being a scuffle, well except for Rayanare's light spear lodged in the ground.
The next day 2 hours after school started
"CRAP, CRAP, CRAP!" Natsu shouted as he sped down the hallways of Kuoh academy searching for his classroom while drawing quite a lot of attention to himself from other classrooms of 1st, 2nd and 3rd year classes. Thanks to a newly revealed fallen angel who occupied much of his thoughts (and dreams) he wasn't able to get much sleep last night as all his thoughts were set on ways of trying to figure out what to do about her sadly he came up with squat. Finally the pinkette found his class, "Hey sorry I'm late I was uh sick this morning but I'm better now" he lied confidently as he walked rushed into the classroom before taking his seat. "Seeing as you're still relatively new and this is the first time I'll give you the benefit of the doubt , now open your mathematics text book at page 253 section 3" the tutor said before she returned to teacher the class going over the equation on the board.
The day went by like normal after that until the end of class, when class finished and the bell sounded for lunch. "Oh right I have to meet with Rias and her Peerage, eh it can wait a few minutes I need to figure out what to do about Rayanare" the slayer thought to himself as he got up from his chair and slung his bag over his shoulder before making his way to the cafeteria before he would meet with Rias and her friends.
With Rias and her peerage
Meanwhile Rias was tapping her fingers impatiently on the arm of a chair with what could be considered a pissed off expression on her face. She figured Natsu would be somewhat late a few minutes at most but it had be almost half an hour now. "My, my Rias I have seen you have such a scary expression on your face in years" Akeno said while setting down a cup of tea before taking a seat on the sofa next to her best friend.
"My brother allowed this guy into the school, his grades are just above average and apart from athletic ability he doesn't seem to be anything special so of course I'm suspicious. However even if I'm just over thinking things and he is a normal student my brother let him into the school so of course I'd want to meet him in person after he had settled in of course…but" Rias replied but her voice grew irritated towards the end "The fact that he is making me one of the most influential people in this school wait for half an hour really says a lot about his character doesn't it?" Rias asked her peerage.
"How dare he make the president wait torch him!" a brown haired teenage boy who also happened to be the same guy from yesterday said with a deranged look on his face due to him thinking something else "With him out of the way it will mean less competition for me, I might not have seen him but if the rumours are true he's even better looking than Kiba. If I'm not careful he'll snatch up Rias and Akeno before I have a chance" "Issei don't you think you're going a bit far, I heard from someone in his maths class that he was sick this morning that's why he was late to school today. Maybe he started feeling ill again and went to the nurse" Akeno said snapping the now known Issei out of his thoughts "Akeno don't tell you're in love with him already?" Issei asked before he started crying anime tears complaining how life wasn't fair causing the Raven haired woman to giggle.
Before anyone could say something further the door of the research club room burst open "Yo sorry I'm late, I had a lot on my mind. So why am I here" Natsu barged in sporting his usual grin. It was at this point Issei decided that maybe he was better off dead because then he wouldn't have to compete with that. Natsu noticed the bawling teen and recognised him as the guy he heavily injured the day previous, seeing him here with Sirszech's sister caused him to internally breathe a sigh of relief.
"Natsu please take a seat I want to get this over with seeing as you've already wasted enough of my time" Rias spoke up very much still annoyed but even more so at the teen's lack of manners. "I don't know who or where you think you are but here manners are very important, you don't just barge into somewhere without knocking, nor do you keep someone waiting when a meeting is scheduled" Rias started to say but ended up scolding the slayer who just scoffed "Great that's exactly what I need another Erza" Natsu muttered under his breath.
"I may be fairly new here and that doesn't mean I can do what I want but just because your brother is tightly involved in this school don't go acting like some spoilt brat who thinks she can parade around the school like she owns it or that she should be treated like a queen" the dragonslayer said in a neutral tone shocking everyone in the room. "Now if there isn't anything else I'll be going Natsu said before getting up to leave but before he could leave he spun around and caught a fist.
"How dare you talk to pres like that!" Issei shouted causing Natsu to smirk, if this kid ad been brought back as a devil then maybe he would be a bit stronger but if this is the person Sirszech told him about that Rias was putting all her hopes onto them this kid was gonna have to get stronger and fast. "Not bad but you're gonna have to do a lot better than that, I've been hit a lot harder than the pathetic punch you threw at me" Natsu mocked as he pushed the teen back, "I honestly don't want to make any enemies at this school but I was just stating that Rias shouldn't let her families position within the school rule her, now if you'll excuse me I have quite a lot of things to figure out" Natsu said before he continued walking out of the clubroom, that is until
RING, RING, RING
Natsu took out his phone and when he saw the caller ID he thought he could mess with group a little long "Yo Grayfia what's up?!" Natsu asked in an extra loud voice to get the attention of Rias' group whose jaws all hit the floor except Issei who was wondering what the big deal was but the rest of the group were all thinking "It can't be that Grayfia!"
"But Fia I don't want to, aw don't get like that Fia I know you like my pet name for you" Natsu said once in an extra loud tone while wondering if this was going to be worth the hospitalizing he'd get from the devil when he got back to his place. Meanwhile Rias, Akeno, Kiba and Koneko were still in shock that Natsu was talking to the strongest Queen in the Underworld so casually let alone gave her a pet name "Okay bye, bye Fia" when Natsu turned around to face Rias and her peerage and saw their faces he internally smirked "Yep worth it!" "Hey Rias, Grayfia hello and something about if you see Sirszech to contact her immediately" Natsu said before closing the door after him leaving a quite dumbfounded group.
"What the hell was that?!" Rias almost shouted while clutching her heads not only did this Natsu guy seem like a prick but he knew Grayfia and she also had to look out for her brother who had most likely snuck out to get out of doing paper work or to see her. Akeno adopted a thinking pose with her head tilted slightly to the side and her index finger against her chin. "Well I suppose it's likely that he met with your brother beforehand about coming to this school and Grayfia was with him maybe they became friends" Akeno suggested before walking off to prepare some more tea Leaving Rias to her thoughts. "Great now I have to worry about my idiot of a big brother screwing something up but I have to worry about the increased activities of fallen angels" the red head thought to herself with a sigh while looking over towards Issei.
Hours later at Natsu's place
"Well that's one day down only four more to go before I can…crap" Natsu said in an bored tone as he entered his house until he felt a presence that made him realise he was forgetting something. "Oh hey Grayfia fancy meeting you here" the pinkette said sweating nervously while backing away trying to reach for the door handle. "Ho, don't you mean Fia?" Grayfia asked menacingly cracking her knuckles while a cold aura surrounded her. Knowing there was now hope of escape or persuading the woman in front of him Natsu did the only thing that could…beg "Please be gentle with me Grayfiaaaaaaaaaaaaaah!" he started to beg but as soon as he finished her name he experienced one of the most mind numbing pains he ever had in his life and well let's just say specific body parts were frozen and the slayer could easily see that Grayfia was some sort of super sadist deep down.
Later that week
The school week had went by pretty much the same as it had previously except it became apparent to everyone that Rias and Issei Hyoudo dubbed one of the perverted trio of the academy didn't like Natsu very much which was reflected in Issei's actions towards the pin haired teen as every time he saw him Issei would start or try to land a punch on Natsu who never bothered to retaliate against even if the brown haired teen would taunt away at him calling Natsu a coward for not fighting back. This however just lowered the already low opinion the other students had of Issei and made their opinion of Natsu skyrocket, specifically the female populace which was the majority of the school.
Although the everyday taunting and attempts to strike him Natsu pushed it aside as he had other problems in the last couple of days he hadn't been able to find Rayanare's scent to find the fallen angel. He was compelled to find her she was a good person deep down Natsu heard her for himself, she had done something to get kicked out of heaven so what even if it was bad he would still help her because she was scared, frightened out her own mind and he didn't really need a reason to help someone in need.
However finally after a these last couple of days of coming up blank Natsu finally found Rayanare's scent however she wasn't alone, there were many other fallen angels and Rias as well as her Peerage were there so Natsu was going to have to disguise himself which meant leaving his scarf at home and finding something to cover his hair as well. "This will do, here" Natsu said as he picked up a red dragon mask and gave the cashier the required amount before sprinting off in the direction he found the scents putting the mask on and pulling up the hood off his jacket as he did so.
Moments later Natsu arrived at what looked like a small old run down chapel, taking a quick sniff of the air he could tell that that all the scents were inside, he then felt a build-up of magical energy and immediately bolted off knowing something was wrong.
Inside the chapel
"Issei you have no problems with this?" Rias asked the brown haired teen who now donned a red scaled gauntlet with a green jewel in the centre of it. "Just get it over with" He said as he stared down at a barely breathing blonde haired teenager. Rias smirked before turning to face to face Rayanare who was on her knees quaking in fear.
"Any last words?" Rias asked not that it mattered to her but Rayanare remained silent causing Rias to narrow her eyes and raise an open palm towards her which resulted in a crimson magic circle forming beneath her, "This is what you get for hurting my servant" Rias replied in a harsh tone before forcing magic into the circle causing it to glow. "This is what I get for the horrible things I've done in my life" Rayanare thought to herself while preparing for the destruction magic to disintegrate her completely.
However fate had other ideas of course, "How about we leave things at this Rias Gremory, I would hate for things to have to get violent" an unfamiliar deep voice spoke causing Rayanare to open her eyes and see that the owner of the voice was holding her in his arms. She saw that he was wearing a red western style dragon mask and had regular clothing on but she noticed a scar on the side of his neck and swore she saw pink hair underneath the hood however she was unable to say anything because she was still getting over the fact she nearly died.
"I'll demand three things right now, your name, that fallen angel and the faction you belong too!" Rias said with authority clear in her voice as she stepped forward. Even though Natsu was somewhat aware of how she acted high and mighty she could act he could help but burst out in laughter, "Hahahahaha!" the deep laughter seemed to get on Rias' nerves but it was the sudden change in his demeanour that caught everyone else off guard. "You Gremory's are always the same, as for your 'demands' I will have to decline you on two of those, I don't plan on handing Rayanare over to you and my name is not something I'll give away so casually but I will tell you I belong to no faction. Now if you'll excuse me, I have a nice long talk I'd like to have with Rayanare here" Natsu said while turning around and walking out of the chapel but as soon as he got outside he was 'trapped between Issei, Koneko and Kiba.
"I believe I said I'd prefer to end this without violence, very well then come at me with all you've got or else you might just die!" Natsu said in a completely serious voice although he didn't me it he was just trying to sounding threatening. "Bastard you're mocking us, you think I'll let you get away with her after everything she's done, guys let's do this!" Issei shouted furiously before Koneko using her rook abilities shot towards the unidentified man at insane speeds but as soon as she got within a few metres the man looked towards here and one glance from his eyes causes an instinct of danger to set of inside the girl who immediately halted her assault before jumping back.
This caused nearly everyone in Rias' peerage and Rayanare to go wide eyed when they saw the state Koneko was in, she was sweating profusely and was hyperventilating "Koneko?" Rias didn't know what was going on, "I've never seen such terrifying eyes, if I hadn't jumped away when I had I'd be dead, who is this guy?" Koneko gritted her teeth as she looked at the man who stood completely calm with Rayanare standing by his side.
"Smart move, if I'm correct your Ms. Gremory's rook which grants you superior offensive and defensive capabilities you may have survived my counter attack but you still would have been seriously injured and quite a bit of forestry would have disappeared" Natsu said in a neutral tone, "If you insist on fighting me still I'd much rather prefer a challenge when you're all back at 100% because with the majority of you injured the battle would be too easy, as well as that I'm aware of all your skills bar the brown haired kid so that is another advantage but my biggest advantage is that you neither know what type of magic or how many types of magic I use nor how powerful I am but if any indication has the kitty cat every backed away from anyone after just a mere look?" Natsu asked before he picked up Rayanare again.
He could see everyone in Rias' group were all sweating and it was then Natsu remembered they were forgetting something "Plus I shouldn't be your primary worry right now, that slot belongs to the blonde girl you left in the church" Natsu said before smirking internally when he saw the look on Issei's face "Asia!" the boy ran off while the gauntlet on his fist dissipated. "Bastard consider yourself lucky" Kiba cursed before allowing his sword to disappear and following everyone else inside leaving only Rias outside facing the man. "Dragon" Natsu suddenly spoke up "What?" Rias looked at the man curiously before shifting her gaze onto Rayanare which caused it to change to disgust. "we're going to end up meeting more often so I would at least like to be addressed as something other than you bastard so pseudo name should suffice" Natsu said before walking away with Rayanare in arms leaving behind a very pissed off Rias who then went back into the church to play her role in this ordeal.
With Natsu and Rayanare
After walking roughly twenty minutes of sprinting Natsu made it back to his place before he set Rayanare down on the couch, the whole way back she still hadn't said a word afraid it wasn't him. Noticing that he still had the mask on Natsu decided to remove to see if it would make Rayanare more comfortable. "Natsu?" she asked upon seeing his face thinking this was some sort of weird dream. "Yep the one and only, here you can use this to cover up" the slayer replied cheerfully at the start but it turned into slight embarrassment as he held out a large blanket that he seemingly got from out of thin air and offered her to cover up her very revealing outfit.
"Thanks" she took the blanket but smirked when she saw the blush on Natsu's face. "Do you want to talk about what happened, I know you were being threatened to do what you did at the loss of your life if you failed" Natsu said in a sympathetic tone shocking Rayanare not at the tone of his voice but at the fact he knew this. "How did you know?" she asked in complete shock and a little bit of fear, she was suspicious of Natsu because she couldn't sense any magic or potential sacred gear, he just seemed like a genuine human, mind you a genuine one of a kind human. This however caused the dragonslayer to chuckle "Oh please you think you're the only magical being using school as a cover" he replied gaining Rayanare's interest as her face took on a curious expression
"Natsu Dragneel Fire Dragonslayer and Wizard of Fairytail at your service" Natsu said while standing and give a bow before lifting up his sleeve to show the red Fairytail symbol on his right shoulder. This however left Rayanare with more questions "Dragonslayer? Fairytail?" Natsu could see the confusion on Rayanare's face. "Tell you what I'll tell you what you want to know if you tell me what I want to know" Natsu offered but the fallen angel wasn't that sure if she told Natsu then it's possible other fallen angel will come after him and try to kill him. "If you're worried about what will happen to me don't worry, I fought opponent way tougher than you could imagine hell I've fought dragons that would be easily way more powerful than Sirszech I'll be fine I'm strong enough to protect both of us" Natsu spoke up in a determined voice while facing her before giving her his usual grin, hearing him say that he would protect somehow reassured.
"Well I suppose I should start with how I became a fallen angel, well I used to be an angel but we are supposed to never allow normal people to ever see us. I broke that rule I order to save a girl from being hit by a truck and so for revealing my identity as an angel to a human I was cast out of heaven and my wings were stained black as a sign of being one of the fallen" she said in a solemn tone while Natsu simply clutched his fists in anger, so much to the point where his nails drew some blood from the palms of his hands.
"That's a bullshit reason for throwing you out of heaven, they should have been praising you for saving a someone's life someone who still had a lot more to live for" Natsu replied in an aggravated tone which made Rayanare smile slightly. "Doesn't really matter now does it, when I heard about the possibility of getting back into heaven I leapt at it without even thinking or hearing out what would be required of me. By the time I learned what that was it was too late for me to back out and even though I didn't want to do it I was told that if I didn't follow orders that I would be killed…" she explained in an emotionless but paused to look directly at Natsu who hadn't moved an inch.
"You were one of my targets that they wanted me to either kill, that's why I disguised myself as Yuuma and asked you out on a date. But it's like you said the time we spent together the memories and my smile they weren't fake for me either" Rayanare continued in happier tone causing Natsu to smile in response. "I didn't want to kill you and even with my deadline approaching I couldn't sense any magic or anything dangerous from you but I wanted to be sure if you were different from other humans that why I asked you the question, to say you're different is an understatement" she said while giggling a bit. "Yeah I get that a lot" Natsu replied in a sheepish tone while scratching the back of his head.
"What about that Issei guy and the girl Asia was it?" Natsu asked and Rayanare's mood changed to that of a solemn one. "Yes, unlike with you they only suspected you of having magic but they couldn't confirm it so after the date I confirmed you didn't have magic however with Issei and Asia other fallen angels had confirmed both of them to have sacred gears, so I was left with little next to no option but to kill Issei, luckily you got in the way. Asia's sacred gear was one that the leader of the fallen angel faction desired for some reason, but removing a sacred gear from someone is tricky and can often result in death, I managed to remove the gear without her killing her but it had gravely adverse effects on her body but even at that she must have felt extreme pain, Rias and her peerage arrived around the same time and they all thought that I had killed her so the fight ensued of course I lost and the rest you know" every word spoke was laced with sorrow but even more so when she began talking about Asia.
"Rayanare I can tell you're sorry for what you did, you were obviously scared for your own life but what amazes me is that even with your life on the line you still tried to save someone, you've shown me you're a good person and I promise I will protect you from you demon, devils, angels anything to keep you safe so dry them eyes and smile for me" Natsu said while tilting Rayanare's face up towards his own while smiling, it wasn't his usual goofy trademark smile this was just a regular smile filled with care and compassion.
But before she could reply a red magic circle appeared in Natsu's living room, "Well can't say I'm surprised given you character…Natsu" a familiar male voice said from within the circle, "Sirszech, what the hell are you doing here?!" Natsu shouted before getting between the Maou and Rayanare while having his magic ready to go. "Well after seeing your little face off with my little sister's peerage I was quite pleased that you managed to end it without resorting to violence that training you're doing must really be paying off if you can cause that sort of reaction while keeping your magic hidden" the crimson haired devil said with a smirk on his face.
"That doesn't answer my question, why are you here?" Natsu asked this time more viciously as his voice came out more of a growl. Sirszech stuck his hand out to the side where a smaller magic circle appeared and in appeared a range of items ranging from female clothing to some of Rayanare's things. "Here's the deal kid, I'll give Rayanare sanctuary at the academy but you'll have to take care of here from any disputes involving her within the school" Sirszech said in a neutral tone shocking both Natsu and Rayanare, however the dragonslayer could only narrow his eyes in suspicion towards the upper devil.
"So what's the catch, what do I have to do to you?" Natsu asked while still maintaining a protective position in front of Rayanare. "Simple really, there's a family in the underworld another one of the 72 pillars and their son and my sister have been arranged to be married. While it is for the sake of maintaining a line of pure blooded devils Rias despises this man, Riser Phoenix and will most do everything in her power to stop the wedding from taking place due to her love and care for her peerage because once she marries into the Phoenix family by extension they become his servants." Sirszech explained while Natsu stood and listened now adopting a calmer stance.
"So you want me to help her stop this wedding?" Natsu summed up but it wasn't quite as simple as he had put it "Yes and no, like I said Rias will do everything in her power to stop this from happening and it will most likely come down to a rating game however she has never officially competed in one before so this would be her first. Knowing my sister she'll accept the rating game with full confidence that her team can win and the latest I can postpone the rating game is a week which she'll use for training but even then it won't be enough because she'll put her faith in the Red Dragon Emperor" Sirszech replied in an exhausted tone, however Natsu's interest was piqued at the sound of Red Dragon Emperor.
"Red Dragon Emperor?" he asked curiously causing Sirszech to smile faintly having remembered the stories Natsu had told him. "Yes the boy Issei Hyoudo contains the sacred gear of the Red Dragon Emperor one of the two heavenly dragons, they were immensely powerful and are in a class of dragon above that of the five dragon kings I told you about I can only imagine that from what you described they may be almost as powerful as the dragons Igneel and Acnologia you told me about, but just because he wields the sacred gear doesn't mean he's every bit as powerful he would need to train to insane levels to master the power to properly use the Red Dragon Emperor's power and that is what my sister fails to see" Sirszech explained to Natsu who now seemed to grasp what it is that the crimson devil wanted him to do.
"So you want me to show Rias and her peerage that just because that Issei kid has a Dragon's sacred gear that I won't guarantee her victory, just so I'm sure just how do you want me to do that" Natsu summed up in a neutral tone before asking the last part in a rhetorical manner which caused Sirszech to smirk "How Gildarts would handle a situation like this" was all the devil said before he disappeared leaving a stunned Rayanare and a smirking Natsu.
"How do you know Sirszech, one of the four Maou" Rayanare screamed out when she had realised what had just transpired, this caused Natsu to let out a dry laugh "Hehe yeah funny story about that guess it my turn to tell you who I really am huh?" the slayer said scratching the back of his head.
"Damn straight it is!"
Chapter End
Okay another chapter finally up I actually rewrote this chapter twice but I finally re-wrote it a way in which I was happy If anybody is wondering what sort of level Natsu is at it will not be Maou level but somewhere near it with all the training he's been doing in the pocket dimension thing you can think of it like the hyperbolic time chamber where one day on the outside is the equivalent of to a year on the inside so if Natsu spends an average of 2 hours a day inside the dimension it's the equivalent 1 months' worth of training so after a week that's 7 months of training in the bag on average . Anyway I hope you enjoyed this chapter as much as I enjoyed writing it.