This fanfiction is a novelization of the work done by Himura Kiseki on Getsuyoubi no Tawawa.

Another Monday started at the station as Onii-san looked for his beloved angel, the one that would help him gather courage to continue this week. After a few seconds, he finally saw her near the stairs and stopped, unsettled. Ai-chan was talking with another high school student, a handsome boy enjoying his youth. Everything in his gestures, way of smiling or attitude towards her indicated that he was definitely hitting on her. After all, who wouldn't ? Ai-chan on the other hand was nicely smiling to her pretender, visibly spreading happiness in their conversation. Her right arm was on her bag in a relaxed manner, crossing her torso to let her massive chest rest a bit on it. Little did she know that passing an arm under it greatly emphasized the volume of her two giant woman attributes. The young high school student in front of her could not help but let his eyes down from time to time, probably astonished by their sizes the same way Onii-san was. Yet, from what he could see in the distance, her angel did not seem to have the same overly sexy and teasing look full of pride that she had displayed to him when her breasts came in the matter. To have such enormous weapons and not knowing that passing an arm under them only emphasized their weight was something excessively cute and innocent. But what if it was actually the opposite ? Maybe she was hitting on him too ! There was no way that she couldn't know that her stand would lead to more looks directed to her two mountains. Surely, she must know ! Knowing that he was not her only pretender made his heart sink into his chest.

Onii-san had oftenly seen it before. Girls that were greatly gifted were sure to draw a lot of attention. Before he could even realize it, this girl had become his Monday's soothing presence. She was just... so pretty, so... beautiful. Where other girls her age would be on their phones, she would be the type to read a book, playing with a strand of her silky hair, floating gently with the wind. The smell of her shampoo would drift when she walks by. She had a clear preference of not weating any type of fancy, jangling jewelry but just a simple watch that underlined her elongated fingers and her well kept nails. It's apparent she did not need any tricks to glorify her amazing beauty and youth. And that wasn't all. Of course, there were always her bountiful breasts which no one couldn't help but look at. Everything, down to her posture, showed how she perfectly understood how she was seen by others.

Ai-chan recognized him in the distance and after a few talks, she left her flirty lover. Both Onii-san and him looked at each other with so much envy and jealousy that they could not help themselves to show a concerned and somewhat angry face. In between them, Ai-chan walked towards Onii-san doing small happy hops, making her J-cup breasts bounce heavily, attracting the two males' gazes on them. Probably feeling their looks weighing on her, she closed her eyes with a smile while putting a strand of her behind her ear, surely aware of the trouble she was making.

Onii-san did not even hear her overly-enjoyed "Hello !". He was way too focused on the other man. Was he just a crush or worse, a lover? Anyway, the other male was looking at her with so much envy in his eyes. As both their gazes meet, Onii-san could definitely feel that in other circumstances, he would have been definitely threatened by him. His look was the one of a man angry about how bold Onii-san was to have laid down a single look on his prey. Onii-san entered the train with their beauty in automatic pilot, unthinking about the present. He was actually scared of this boy. He would have argued that he did not even touch her directly, mostly her stomach and face though during an accident. That it was her that made him button her jacket, not him ! But in a way, it would be okay for him to leave her to this man, he did not want any troubles and the pure joy she brought to him was more than enough for his poor soul. He just wanted to see her, to see her figure, nothing else ! Surely, he would never be with him but seeing her was enough. Seeing a dream come true is enough.

Onii-san was abruptly jolted out of his thoughts by a great increase of soft pressure on his stomach. This sensation was unmistakable for him. It was the one of Ai-chan's two massive mountains of young feminine flesh being gently pressed against him. The large area of his stomach concerned by it, the unfathomable amount of volume pressed against him and the pure softness let no doubt it was Ai-chan's doing again. Without him realizing, they already boarded the train which was a bit more crowded than usual, even though not as much as the first time they met each other. Yet, it was full enough for Ai-chan to go into her usual corner, shielded by her guard, namely him. The number of passengers did not let them choose to avoid contact and Ai-chan let her ample bosom squish against him. Onii-san was quite happy as that would mean that for the first time since the very first Monday, he would feel Ai-chan's mountains pressed against him for the whole duration of the trip.

Ai-chan's made her chest wiggle a bit from left to right and called with a worried look :

- Onii-san!

- Ha! Sorry! he said, drawn back to reality by their physical contact. I was just thinking about something.

Ai-chan pouted at his answer. How can Onii-san think about something else in her presence, especially with her chest pressed against his stomach?

- Onii-san, have you...

Ai-chan shrugged her shoulders, squeezing her breasts' masses even more onwards into Onii-san.

-... already gotten used to being with me? she said sadly.

Onii-san gulped. She seemed down at his reaction but she could not be more wrong. Fearful at the thought of a first argument with her, he answered quickly :

- No, not at all! Meeting you every week is a blessing for a mere corporate slave who's hitting his thirties! It keeps on giving me a renewed sense of appreciation and I've never taken this blessing for granted!

Onii-san could not even believe that he managed to say all that without even stuttering with such pressure against him.

- There you go, brushing me off again, said Ai-chan, visibly annoyed.

Even though she looked bored of his monologue, she did not manage to hide her slight amusement in her eyes. But something was still off. And Onii-san's declaration was exactly what he thought, though. There is no way he will get bored of her well-proportioned face, her big colorful eyes, her tender lips, her rapidly changing emotions, her joy and youth... And of course, the immense force of her chest trying to push him away from her.

- Why are you staring at me like that? she asked.

- O-oh, uh, nothing, sorry.

- Well, I am used to people staring at me… she said, bothered. Like now, someone for another school.

Visibly annoyed by her unrelenting popularity, she let out a sigh. Onii-san melted as he felt her small figure gathering air in her lungs. Her massive chest grew more and more, pushing her two mountains of flesh against his belly. Again, with this simple action, the young teenager showed him unknowingly how colossal her breasts were. The strong emphasis on her popularity and how everyone was looking at her did not help either. Hell, she was so pretty and her silhouette was standing out of the crowd so much that even boys from the neighboring high school heard about her and wanted to take their chance. After all, Ai-chan's bust size was incredible. Reaching a J-cup sized bra while maintaining a small and slender figure during high school was a wonderful prowess, certainly coming under the terms of "miracle" or "holy". Most of the busty girls of that age would usually stop around a D-cup. Onii-san remembered that one girl from his own high school back in the days, who was rumored to be an E-cup. And there was Ai-chan with more than five more full cups ahead and still growing according to her. No wonder why so many people were attracted to her. She was just pure perfection.

Onii-san liked to think he was the only one to experience this happiness. He really liked to think that. But how can he be sure? She was a high schooler, a time when everybody falls in love and has a partner. She was definitely popular with the guys with such prominent breasts. Even in the other schools apparently. She must definitely be the school idol. Onii-san let his imagination drive him back to when he was a teenager but this time with Ai-chan included in the picture. He pictured various events of her doing sports and see her breasts bouncing in her school uniform, her holding his hand in front of the other jealous boys, reviewing together for a test with her breasts resting on a table, their first kiss eyes closed on a...

- Here's your button for the week.

Again, Onii-san was jolted out of his daydream as Ai-chan was handing him a button of her shirt that had previously popped. Ai-chan pouted while looking at him :

- Ah, are you doubting me ? It really burst off a few days ago, you know, she said with a smile.

Onii-san shook his head.

- Ah no, it's not that I'm doubting you...

How could he ? The immense pressure on him greatly demonstrated that she had the ability to pop button of her shirt any time she wanted to.

- Onii-san, you've been acting quite weird this morning. It's like you're not paying any attention to me at all.

- U-uh no, sorry... Actually, it is quite the opposite.

Again, Ai-chan sighed, increasing temporarily the pressure between them. She then adopted a very serious tone :

- I know you don't think that highly of yourself so you might not believe me when I say this...But every week, I'm also...

She stopped for a moment and only the train's rattle and other conversations could be heard in the background.

- You're also… what?

Ai-chan looked down on the chest of Onii-san, far from his gaze, hiding her emotions for the first time.

- Nothing. she replied with a small voice.

Another moment of silence.

- Onii-san…, she said again.

They looked at each other and Onii-san knew in her eyes that she finally understood what all his weirdness of today was about.

- Do you happen to be curious about who I was talking to earlier?

Onii-san gulped down, unable to hide his jealousy. Seeing in his expression that she put her finger on the problem, she continued with the same serious tone :

- Like, you want to know what kind of relationship I have with him? Or maybe do you want to know if I'm dating someone?

Again, he gulped down and sweat drops started to drip from his forehead. Was she about to tell him that she was actually in a couple with someone ? That this whole adventure was about to come to an end ?

- Or even whether I've dated anyone before in the first place?

The train rattled, making her breasts jiggle against him. She looked down to it as her flesh jiggled in her tight shirt. There was no need for her to imagine Onii-san's reaction to it.

- Or even… if I have that kind of experience?

Onii-san gasped, almost unable to breathe. He could feel his heart shatter in his chest. With the millions of pretenders gathering around her beauty, he could just wait for her to say it.

- It's all a secret, she finished seriously.

The busty teenager's mood changed radically. She slightly leaned onwards, pushing forward with her breasts. The pressure increased more and more and she was doing it deliberately. Her flesh spread all over his belly, again showing how excessively massive her two breasts were.

Ai-chan approached her face and he saw her smile for the first time since they entered the train. That prideful and teasing smile, sparkled with glee. The smile she always gave while playing with him. The smile of a person who knew how powerful she was. Ai-chan's smile. She whispered :

- It's a secret... For now.

Onii-san gulped down with difficulty as his arousement grew even more. She backed off a little, decreasing the pressure before saying :

- Instead, I will tell you something else. One of my biggest secrets.

She tilted her head on the side and said with a large smile :

- Didn't you notice anything different about today's button?

Onii-san gathered himself and looked at the button still in his hand. It was also white like Ai-chan's uniform shirt but the shape was actually different.

- Yes, now that you mention it, the shape is different than usual.

- Impressive, Onii-san she exclaimed gleefully, her eyes closed.

She looked around a bit before whispering again :

- It's a button from my work uniform, she said softly. It's a waitress uniform, she continued without giving time to Onii-san to process what she was saying, and the apron is shaped just like this.

With her two indexes, she drew an imaginary line from her shoulders down to the top of her bosom. During so, she followed the large curvature of her silhouette both on width and onward, inviting Onii-san to follow them with his eyes. It was the first time that he could look at them directly with her approval. From above, two masses as large as watermelons were crushed against him and one other making her shirt quite tight. When she finally reached the point where her breasts were squeezed against him, she continued to follow the curvature of her breasts, both touching with the tip of her index her soft flesh and Onii-san's torso. She purposefully underlined the perimeter of her breasts against him. Feeling the fingers of Ai-chan's on his body gave him the chills, especially as she was showing again how large her chest was. Finally, she continued by going back inwards towards her small belly.

- This apron... Sure is not a very functional apron, is it? she said teasingly

Onii-san immediately understood. Her company's manager did not do anything to flatten Ai-chan's gifts with the design of their apron. With almost 20 centimeters of flesh coming out of her chest, there was no way that she could avoid any stains. But the apron was also never meant to do so. From the silhouette she drew, it looks like that the apron's only job was to magnify the bosom of their owners. Onii-san's gulped down again. How could you make her chest even more imposing? Her everyday school uniform with her shirt full of creases and gaps between the buttons and her ever-open blazer already showed how colossal Ai-chan's huge assets were. Was it still possible for her to show even more volume than that? Onii-san saw Ai-chan's smirk and he knew that she knew what he was thinking. And that smirk said it all. "Yes, you still don't know how massive my breasts are and I love the fact that you can't even imagine it". That was her smirk.

Ai-chan winked at his gaping and continued whispering :

- Our school does not allow part-time jobs so please keep it a secret!

She leaned forward and whispered with a large smile :

- You are the only one who knows my secret, Onii-san. If you like, please come visit me at this address.

The train stopped at her station. The crowd emptied and Onii-san, still his mouth open after these revelations, was forced to step aside. The decrease of pressure made her chest bounce a little back into its natural position. With a large smirk on her face, she advanced to the doors, aware of him trying to picture her body squeezed in a waitress uniform. She made no efforts to contain the jiggling of her breasts like she would normally do. They waved at each other and the train left. As the high-school students were leaving the platform, Ai-chan's finished her sentence for herself in a whisper :

- Onii-san, I also look forward to meeting you every week, I really do...