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Matsuri had four older brothers. And once both their parents went missing, that was all that she had.
Matoi made sure to take care of his siblings, especially Matsuri, and made sure they all had food and a home, but clothes…
Clothes were a bit harder to get in a house full of pre-teens and young teens who were constantly growing. The guys usually wore what they already had, or shared clothes with each other as they got bigger. Matoi and Nagare usually bought new clothes, with the items being handed down as needed.
Matsuri occasionally got handed down items, but she was a girl.
Matoi always made sure Matsuri had enough food and slept okay. And when it came to most clothes, Matsuri was okay with wearing old stuff or borrowing from her brothers if needed.
And then her chest started getting bigger.
She did her best to not to care at first, borrowing a sweater that was too big for her on a regular basis. It was technically Matoi's, but it had been handed down to Nagare and then Shou and it technically belonged to Daimon but he never wore it. So Matsuri decided to borrow it, and if nobody wanted it back, it would be hers.
When Matsuri had gotten her first period, she dealt with it by using toilet paper and asking her friends for help, not involving her brothers in buying anything. But as her friends developed and bought bras, and she also got bigger, Matsuri knew she had to say something. One evening, she asked to speak to her oldest brother in private.
"What is it?"
"I…uh," Matsuri hesitated. It was a bit embarrassing. She looked at the ground as she spoke. "I need a bra."
"Oh," Matoi said. "…that makes sense. Right. We should go-"
"No! You can't-"
"I am the oldest and I am responsible for buying new clothes. Including this. Though I could ask the neighbours to take you? Though tomorrow may be too soon for that…"
"Yeah," Matsuri said. "And I can pay you back-"
"Nope. This is a necessity. How much do bras cost?"
"…I don't know," Matsuri claimed. It was partly true, she didn't know off the top of her head, but she had an idea.
"Well, whatever. I'll worry about that tomorrow," Matoi said. "Thanks for telling me. Uh, when did you first notice, uh, y'know, that you would need one…?"
"…sometime last year."
"And you didn't say anything?! Sorry, I'm not mad," Matoi said when he realized he yelled. "Just, you should've told me sooner."
"I would've felt awkward even telling Mom, and telling you is even more embarrassing…"
"Fair. It's fine. Thanks for telling me, we'll figure this out in the morning."
Matsuri nodded and went to get ready for bed, still wearing her brother's sweater.
It would probably only be a few days until Matsuri got a bra, as she would definitely go shopping on the weekend at the latest. But even though she was excited for that, Matsuri was sure she would still borrow her brother's sweaters. After all, she had been wearing this one consistently since last year. It was basically hers.