It was another Monday at the train station. Ai-chan was just a bit more late than usual and the young girl was walking fast around the station to find her crowded train protector. Arriving on the platform, it only took her a dozen seconds to find him waiting on a bench. From afar, he seemed a bit down, sleepily scrolling on his phone. With a large and big smile on her face, the young teenager approached him happily and shouted joyfully to him :

- Ah! Looks like I found another...

The busty angel had put her arms behind her back, sticked out her overgrown bosom and bent over him with great magnitude to look on top of his head, giggling.

- ...grey hair!

Onii-san was startled out of his boredom by Ai-chan's loud joyful voice. He immediately looked up only to see her oversized bust barely a few centimeters away from his eyes. His male gaze was almost instantly drawn to her collar and what he saw was undoubtedly the most magnificent view he ever had the chance to see with his very own eyes. Her neck button was not buttoned up and her tie carelessly loosened, allowing him to take a peek in her secret area underneath her shirt. It was astounding, to say the least. In front of his greedy eyes, he saw for the very first time the spotless and perfect soft skin of her two massive and gigantic breasts that were fiercely defying their containers, namely her shirt and bra. Onii-san's jaw dropped at the sight of their size. Even after all this time, it was like he could not really understand how impossibly huge Ai-chan's assets were. Each one of her J-cup sized mountains looked as big as her head from which his peripheral vision could only see her big amused smile as she kept examining his hair. Their sizes defied everything he had known so far. Just how huge were they? At this very moment, a good 75% of his vision, if not more, was occupied by her ample chest. It was also the first time he saw the pale skin of her mounds, something he could only have guess when they were pressed against his belly. But even in his imagination, he couldn't have pictured something as outstanding. For the reason was just in plain sight. Right at his eye-level, in-between her monstrously big assets, Onii-san could see the very beginning of Ai-chan's large, tight and deep cleavage. Her massive breasts appeared to be squeezed tightly against one another on all of their diameters, making it impossible for even light or air to go through her deep canyon. Onii-san guessed that since their size were so great, her bra had no other choice but to squeeze them with all its might just to provide any support to her ample bosom's mass. This feat was even more impressive given the fact that she was bending over, supposedly giving relief to her bra. But to Onii-san's ecstatic eyes, the tightness of her cleavage looked as incredible as the depth it was vaguely showing. Given the proportions he knew from looking every Monday at Ai-chan's bountiful bosom, her cleavage was easily more than 20cm deep. Unable to restrain himself, his male mind quickly imagined him being sandwiched between them, being so easily swallowed in her tight and warm canyon. To top it all, her teasing assets retained a bit of their swaying from her bending. The movement of her chest greatly emphasized how heavy it was, showing proudly to Onii-san that it had to be counted in kilograms rather than regular grams. Its movement also heavily suggested how firm it was, absorbing with difficulty the bending of its young owner. It was pure perfection.

Still bending over him, Ai-chan stepped back a little for their eyes to meet. She put a strand of hair behind her ear and shouted loudly with a big smile :

- Good morning!

Onii-san stayed motionless, his mouth gaping.

- What's wrong? she asked.

- Nothing much but...

Onii-san stood up, greatly surpassing her short stature.

- ... why don't you fasten your collar and necktie... all the way? he said with a faint smile.

Ai-chan's face turned red almost faster than a traffic light as she quickly took a step back, her large bosom bouncing with her move. She immediately covered her cleavage region with her right hand and slightly turned her front view away from his gaze. With a face expression mixed with surprise, embarrassment and distraught, she asked anxiously :

- Did you see?

Onii-san chuckled. It was undoubtedly amusing to see her embarrassed. She had been teasing him every Monday since their meeting and for once her incredible assets turned against their owner. With a cunning smile on his face he replied with delight :

- I saw a magnificent round and rather big valley.

She looked at him with her big green eyes filled with dismay but deep within them, he definitely perceived her amusement. Rolling her eyes up, she headed towards the train tracks with a big annoyed and audible sigh. She was being followed by his now-happy protector. For the first time in a while, he managed to switch his usual position of being teased. Without even looking at him, she continued :

- To answer your question, it may be because I have to wear a larger shirt, she answered, her hand still on her collar to prevent him from getting his treat again.

- Yeah maybe.

As they arrived near the train tracks, Onii-san asked :

- Hey, Ai-chan, you said you have a committee meeting every monday morning, right?

- Yes, and?

- Could it be... You're in that committee? he said with a smile and a strong emphasis on the "that". You know... the moral committee member that ends up disturbing the morals herself.

Ai-chan turned around and looked at him confused but started to understand what he was imagining. She definitely saw this trope in some teen movies or mangas. Onii-san must have most certainly pictured her in his mind as a member of the morale committee, scolding boys who thought about lewd things and being conservative about the school clothing. All that while not understanding that her huge breasts were the cause of the disturbance, everywhere she would go. Ai-chan always thought it was some kind of a weird fetish to have but she reckoned to herself that she was not a complete stranger to these situations either. But she greatly refrain herself to not talk about it to avoid fueling Onii-san's imagination

- Is that from the Showa Period? Or Heisei Period? she asked, trying to divert his mind from his dream.

Her Onii-chan did not answer, his eyes still looking at the horizon, definitely picturing her in all sorts of weird situations.

- Hey! I'm just the class representative! And I don't disturb the morals anyways! I always button it up all the way once I get to school! she said with the most convincing tone she could do.

- I see, replied Onii-san, a bit suspicious but amused by how she was defending herself.

Ai-chan put a satisfied smile on her face, thanks to how she managed to get his ideas out of his mind. She gently put a hand on top of her chest and felt the weight of her Onii-san gaze on it and that made her smile a bit more.

- You know, our student council president is pretty strict about these things...

- Well that's a good thing. For the sake of those young boys with a bright future, they have to be sure to keep you in check, Ai-chan.

Ai-chan looked at him suspiciously.

- What is that supposed to mean? she asked, squinting.

Onii-san sighed with a big smile on his face while looking at her eyes:

- Ai-chan, you can't even button your jacket.

Ai-chan sighed, irritated. She hated it but he definitely made a point. And she had nothing to answer. Deciding to not take it into account and even to embrace it, she stuck out her enormous chest a bit further. Onii-san's smile vanished a bit to return to his usual shocked expression of seeing how huge her assets were. Satisfied by how ridiculously easy it was to keep the upper hand on the conversation, she continued :

- Well, I am a really good student, you know? My homeroom teacher trusts me completely!

But Onii-san was not letting her have it so easily. It was now a battle between him and her.

- I see.. Even though you're keeping your part-time job of being a waitress a secret from your school?

Caught off guard, Ai-chan was left speechless while Onii-san laughed at her. Having a secret job outside of school was already breaking the rules of the school. So what about the fact that the bustiest girl in high-school was dressing in a waitress uniform, to top it all ? Upset seeing him win so easily this argument with witty comebacks, she resorted to annoy him just like he was doing to her.

- He's pretty young so I guess he should be okay with it..

Onii-san stopped laughing as fast as he started.

- Eh? Your homeroom teacher is a young man? He said, disconcerted

- Yes, he's fairly popular with the female students because of his looks.

- Whaaat?!

Ai-chan giggled teasingly. In just two sentences, she managed to turn the tables of the discussion. She could see that Onii-san's mind was already adrift.

Full of envy, he pictured himself as this young and handsome teacher. In the classroom of his youth, her young and beautiful Ai-chan was standing just in front of him, leaning slightly forward, exposing the tremendous amount of volume that was creating large creases and gaps in between her buttons.

- Hey sensei? Do you have a girlfriend? No? That's such a shame, he heard her ask, with a heavy seductive tone in her voice.

She continued with her largest smile and most seductive gaze he could imagine :

- I see you staring at me pretty often in class, I'm certain I'm not imagining it.

She approached him closer and arched her back as much as she could. Meanwhile, she stuck out her heavy and gigantic J-cup chest, putting a great stress on her shirt to the point where her buttons were about to pop. She looked at him with a thirsty smile as she gently poked her huge right breast, her finger squishing her soft skin :

- Is there a particular reason why you're always looking at me around there? as her proud smile grew wider.

Still leaning forward, she approached him to the point her breasts softly met his torso. She whispered :

- Is that why you want me to come to the night shift at the guards room in the old school building for a… one-on-one session?

She leaned her whole bosom on him and approached her lips to his mouth, licking them as she was approaching it...

- He's a really good teacher who's easy to get along with, said Ai-chan's voice, almost echoing through his dream. I don't even get weird glances from him.

Onii-san woke up from his erotic dream, a bit shattered by Ai-chan's statement. Of course, no teacher would be that horny enough to do that kind of stuff with a teenager and Ai-chan was definitely a master of seduction but in a very more subtle way. It was clear that she was definitely a shy kind of girl. She only acted proud or mischievous with him...

- And he seems very busy with his duties as the advisor to the student council.

...but it was not a sin to imagine her a little bit more.

- Are you even listening?

No. He wasn't listening. Onii-san had already drowned himself into his imagination again. How would it be to have a young girl as beautiful and well-endowed Ai-chan as a student ? Given the tremendous amount of flesh she was carrying, she would obviously let it rest on the table. What a scene to behold that would be on a daily basis. And just to see her beauty all day... A bit louder than he would have expected to say, he shouted :

- No way! Working at a school where there is a girl like you coming every day in your tight school uniform...!

He imagined her meeting an eye contact with his teacher. And with a discreet smile, she would draw her collar down with just her index, exposing to him her tremendously large and deep cleavage, the same one Onii-san saw just moments ago.

- He must be constantly torn by his professional ethics!

Ai-chan looked at him with immense amusement, literally laughing at her protector while their train arrived. His little speech left so many giveaways as to what kind of dream he had but she was not mad at all. Once again, she had greatly played him. Giggling, she replied :

- Come on! There's no way a real adult would look at a high school student in that kind of way!

As they boarded the train, the crowd pushed them to their usual spot and once again, she let her monstrously huge breasts get squeezed against him, making him sigh of pure bliss. It was beyond understanding how good it was to feel their incredible softness and mass against him.

- He's not like you, Onii-san...

Ai-chan gave him the usual button that popped from her shirt this week as she replied with her cheerful laugh and seductive smile. The close proximity with her beauty made him realize he was actually hard since the moment he saw her cleavage. Luckily though, Ai-chan's bosom was so ample that their lower body part never actually touched once. Onii-san gulped down awkwardly and could not find anything to reply. He was a grown man and yet completely mesmerized by this young girl. Meanwhile, with still her proud smile on her face, Ai-chan giggled. She knew right away that she would greatly enjoy the ride squishing her divine body onto her friend. Despite what she previously said, her neck button was still open...