Requested by s728892

I apologize that it took so long and I hope you like it

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Everything happened so fast. Ten months ago, Matsuzou and Matsuyo told their sons that their mother is pregnant, so they will get a little sibling. Of course, the brothers freaked out and didn't knew how to deal with this at first. After all, their sibling would be a baby while they are adults. Still, the more time passed by and they found out they get a baby sister, the sextuplets got a little excited. Matsuzou told them they need to help of course, but at the same time they can teach their baby sister what she needs in life.

Maybe.

One month ago, Matsuyo gave birth to you cute little cupcake and the brothers fell straight in love with you after seeing you. Of course they were afraid to hold you in their arms, but after you all were at home, they carefully took you. Since this day, the brothers doesn't leave you one second alone. Only when you take naps in your crib.

Today, the parents left for the whole day their sons with their baby daughter alone. The sextuplets were very happy to have you all for themselves for a whole day. Normally, you are more near Matsuyo since you still get mother milk and you are a very hungry baby.

It's 6 AM and you lay on the ground on your back, staring up to Jyushimatsu who is getting your attention with funny faces. Still, you don't laugh yet and can only stare at your brother with big eyes. "And if anything happens, call me or an ambulance, understand?" Matsuyo says serious. "We know Kaa-san." Choromatsu says with a small sigh. "We will be back around 8 PM, so make sure to bring Y/n early to bed." Matsuzou looks at Osomatsu. "This was one time when I forget to put Y/n early into bed." Osomatsu sulks and crossed his arms over his chest.

After giving a small check-up on you for the last time today, Matsuzou and Matsuyo left the house.

"Finally! Y/n's Onii-chan will play with her right away~!" Osomatsu coos happy, quickly walking to the living room. The others quickly follow him, wanting to spend time with you too. This is the first time they are alone with their baby sister and you can see they are very excited.

Jyushimatsu hums confused, seeing no reaction to his funny faces. 'Maybe she is sick? Normally, Y/n is laughing when I do this.' The others entering the room and Osomatsu is the first who sit down to your free side. "Y/n~! You're Onii-chan is here~!" He coos and tickles your side very gentle. You squirm around, but don't giggle like usual. Osomatsu hums confused and stops, since you seemed a little uncomfortable. "Is Y/n sick?" "I don't know." Todomatsu says a bit worried.

"She's hungry. Just like usual." Ichimatsu sighs and walks into the kitchen, doing what his mother explained to him. Since you still drink mother milk, Matsuyo made sure to pump out some milk and filling it into your baby flasks. Since you drink much, you have for the whole day 10 flasks in the fridge. If they need some milk, they will just warm it up.

Taking a few minutes in the kitchen, Ichimatsu returns with the warm milk bottle. He is the only one who knows how to feed you, since Matsuyo explained it to him. "Let me feed her, Ichimacchan~!" Osomatsu tries to take the bottle out of Ichimatsu's hand, but gets stopped from Karamatsu and Choromatsu. Neither of them know how to feed you right. Matsuyo explained to them that you could choke on the milk if they hold the bottle wrong. Even if Ichimatsu said he can never take so much responsibility, he is the only one who would be calm enough to feed you without freaking out. He is doing this from the inside.

Ichimatsu picks you carefully up and makes sure you are in the right position. The others watching closely how to do this. Once you are comfortable, Ichimatsu press the warm milk gentle against your lips. You hesitate at first, but open your mouth and suck slowly on it. Once you notice that milk comes out of it, you start to suck more on it and drink faster. Your brothers blushing softly, seeing you for the first time eating. Normally they don't watch you eating, since they don't wanna see their mother's breasts. Todomatsu quickly makes takes out his smartphone and makes a video.

"Whoa, Y/n looks even cuter right now." Osomatsu says with slight sparkling eyes. "She is the cutest girl on this world~. Even cuter than Totoko-chan~." Choromatsu says dreamy. "Yes~." The others agree. Once you finished the whole bottle, you pull away and Ichimatsu place down the bottle. He lays you gentle onto his shoulder and a few gentle pats on your back later, you let out a cute burp. "Awww~!" Is all your six brothers can say to this.

Ichimatsu lays you gentle down onto the floor again, back laying on the baby blanket. Your brothers surrounding you again in a circle, but this time you giggle and reach your tiny hands up to them. For you are the six same faces rather funny, but sometimes it's confusing you. One time, you even cried when Karamatsu was holding you and Osomatsu made the same face like him. You thought Osomatsu is Karamatsu and wanted to got hold by him, only to return crying back to Karamatsu after you saw his face again.

They had much fun.

~Later~
You suddenly started to cry while Karamatsu was watching. Immediately, the other five rushed into the living room. After some time asking what's wrong, they started to smell something. "No! I'm not doing this!" "Like hell I do it." "Me two!" "Me three!" "Heh. I might throw up." Choromatsu groans, seeing none of his brothers will change your diaper. You cry without any break in discomfort, so Choromatsu will do it now. "Next time, one of you has his turn." Choromatsu picks you carefully up and walks upstairs, to your room. There are standing your toys and crib, but once you are older the brothers want you in their room, just to make sure you are safe.

Choromatsu slide the door shut behind him and lays you carefully down onto the small mattress for babies who is made for changing diapers. You squirm a bit around, but to Choromatsu luck you can't crawl yet. Choromatsu sighs and put on rubber gloves, because he doesn't want anything on his hands. He gets everything he needs and take off your diaper. You stop to cry when he wipes your butt clean, only a few whimpers leaving your mouth. "I know, I know. You don't like it, but maybe in two years you can use the toilet."

After Choromatsu changed your diaper and you are all clean again, you giggle in happiness and reach your tiny hands up to him. Choromatsu smiles softly and takes off the gloves, before he picks you gentle up again and walks into the bedroom from him and his brothers. There lays a soft blanket for you too and a few toys, since you play sometimes with your brothers there.

You yawn cutely and squirm a little in Choromatsu's arms. He sighs quietly and turns around, walking back to your room. Choromatsu lays you carefully down into your crib and kiss your cheek softly. You smile a little and fall asleep rather quick. Choromatsu turns on the baby-phone and slide the door quietly shut, walking downstairs.

~Time skip~
You woke up when you felt hungry and after Ichimatsu feeding you again, you play now with Osomatsu, Jyushimatsu and Todomatsu. The other three needed to buy some baby things for you. "Y/n~! Look to your Onii-chan~!" Osomatsu coos with an smile, waving his hands a little. You pay attention to him, but only for two seconds. Todomatsu took out a few toy keys and jingle them over your head, what turned your attention quick to the keys. You giggle and reach your tiny hands out to the keys, trying to grab them.

"Totty~!" Osomatsu whines and reach his hand out to your toy keys. "Nuh-uh! It was my idea." Todomatsu pulls the key away, and you follow them. "Y/n! Y/n! Look!" Jyushimatsu says excited, earning your attention. He covers his face with his hands before taking them away again and making a funny face. You start to giggle and clap your hands together, melting the heart from your brothers. "Y/n~! Look to your Onii-chan~!" You look back to Osomatsu and he covers his face as well.

" ... Peekaboo~!" Osomatsu coos with an happy smile. You start to giggle again and reach for Osomatsu. He wants to pick you up, but Todomatsu slaps his hands away. "Ouch!" "You know that Y/n squirms in our arms when she laughs. Besides, we need to be very careful with her."Osomatsu pouts and rubs his hands. "You're so mean, Totty."

You look at Jyushimatsu with big eyes while he jingles the toy keys slowly over your head. You reach your hands out to the key and he hold it down as much as you needed to grab them. You giggle in joy and throw them away when Jyushimatsu let go. Your three brothers looking in aww at you, smiling dreamy.

The three can play with you for only ten minutes, until you yawn again and fall asleep. Newborn babies sleeping in a day 16 - 18 hours, but sometimes it feels like you only sleep 3 hours.

~At night~
After Matsuzou and Matsuyo came back, they were very relieved to see that you are still alive. The sextuplets were very proud that they took care of you all by themselves and celebrate this by Chibita. When they came back, you were already sleeping and your parents as well. The brothers decided it's the best to go to bed too and fell very fast asleep after such a long day.

Until you wake up and start to cry.

The sextuplets waking up and quickly standing up, rushing to your room a bit stumbling. Matsuzou wanted to get up too, but when he hears fast footsteps and the whispers from his sons, he laid back into bed with a smile.

Karamatsu picks you carefully up, out of your crib and rocks you very gentle. "Y/n, it's okay~. Your Onii-chan is here~." Osomatsu coos with a soft voice, wiping your tears softly away from your cheeks. "Don't cry." Todomatsu says with a calming voice. "We are here." Choromatsu says with a smile, holding your tiny hand very gentle.

You whimper and slowly calm down. The sextuplets smiling softly, waiting until you fall asleep again. The six sitting down on the floor to have it more comfortable. You giggle when you see your brothers, but just seeing them gives you the feeling of safety and you fall asleep from it.

One thing is for sure.

These six will protect you until the day they die.