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Y/N placed the yawning Izuku on his bed, feeling drowsy and sleepy. "I'm going to be right back Izuku." She ruffled his broccoli-like hair softly and went to the bathroom to change into her pajamas.

Once she was done dressing, she walked back out and into Izuku's room. There were two beds. One for Y/N and the other one for brother. She went to her desk and turned on her f/c computer. The green haired teenager began typing away on her keyboard, which made Midoriya groaned slightly.

"Y/N...can you tuck me in please?" Izuku mumbled tiredly. His sister turned to him and gave him a small grin, "Of course I'll tuck you in." She got up and walked over to him, placing the blanket over his small fragile body.

"Sis, do you think I'll be a hero?" Izuku asked softly, that question made Y/N rose her brow in curiosity. "Well of course. You'll be strong like All Might!" She puffed out her chest, doing an impression of the infamous hero of all. The green haired boy's eyes brightened and smiled widely.

"Y-Yeah! O-oh! What do you think my quirk is going to be?!" Midoriya responded with excitement. His sister tapped her chin curiously.

"I'm not sure, but I bet it's going to be awesome!!" She pumped her fist in the air. Izuku did the same.

'If only he knew...' Y/N's arms wrapped around her brother softly.

"Goodnight bro, sweet dreams." She pecked Midoriya's forehead lovingly.

"Goodnight Y/N."

The boy finally went to sleep, leaving his sister smiling and turned off her computer.

'I should probably go to sleep too.' Y/N went over to his bed and crawled next to him, the boy beamed happily in his sleep and started to cuddle her.

Y/N chuckled quietly and petted the boy's hair, falling into a deep slumber.

In the morning...

"Y/N! Wake up sis!" Izuku jumped on his bed up and down, making her grumble and pull up the covers over her face. "Not now, Izuku. I'm sleeping..." She replied with a tired tone. The green haired boy huffed and sat on top of her, "But I need to go to school! I'm going to meet my friend!" Y/N quickly pulled away the covers and grabbed the small boy's shoulders.

"What? What's their name?! I need to know!!" The older sister shook him back in forth, which made the boy laugh slightly. "His name is Katsuki Bakugo!" Y/N tilted her head in confusion, "Really? Is he being nice to you?" She poked his cheek, Izuku nodded without hesitation. "Uh huh! I bet his quirk is going to be amazing!" Y/N chuckled and let go of him softly.

"Not as amazing as yours bro!" The sister playfully began tickling her small brother. Midoriya tried to form in a ball but couldn't, since he was laughing so hard. "N-no! S-sis you know that's my tickle...spot!!!" Y/N cackled evilly and swung his legs over her shoulders. "Breakfast time bud!" She started to rush towards the kitchen, leaving Izuku laughing.

Inko was making [favorite food] and heard the scream of Y/N and Izuku. "Y/N? Izu-" The teenager went to the kitchen and quickly stopped herself, making Izuku dangling around on her shoulders. "Y/N!! Put Izuku down right now!" Inko sweatdropped which Y/N laughed nervously, "Eheh, Sorry momma." She then put the dizzy small Izuku down on the ground. Inko sighed in relief.

"I packed you lunch already Izuku, time to eat breakfast!" Inko smiled gently at them.

"Heck yeah!!!" Y/N and Midoriya shouted in sync, pumping their fists in the air.

At Izuku's School...

"Here we are kiddo!" Y/N ruffled her little brother's head. Which made him giggle a little, "Y/N! Can you come with me inside? I want you to meet Kacchan!" 'How can I say no to that face?!' Y/N thought and smiled happily down at her brother. "Of course Izuku! Come on, let's head inside." The green haired boy nodded in agreement and held her hand.

There were full of little kids and two adults were watching over them. 'This place is too cute for me...' Y/N looked around slowly.

"So Izuku, where's is he?" She asked curiously. The boy responded with his finger pointing at a kid with spiky hair and ruby eyes. This caught Y/N'a interest a bit. "Kacchan! Over here!" Midoriya shouted out as the kid looked over at them. 'That's him?' Y/N rose a brow in curiosity.

"What is it Deku?" Katsuki walked over to the two siblings and froze. He slowly glanced up at the beautiful teenager, who was grinning at him. "I want you to meet my big sister! Y/N, Katsuki, Katsuki, Y/N!" Izuku replied happily. But the spiky hair boy didn't said anything, he just stared at Izuku's sister.

"Hello Katsuki, Nice to meet you!" Y/N said with a slight grin. Bakugo immediately blushed, 'Oh my god...she's an angel! Wait...what am I thinking?!'

He stood up straight and took out his hand, "N-Nice to meet you t-too!" Y/N took his hand and gently shook his hand. 'He's so cute! But I wonder why he called Izuku, Deku..' Izuku tilted his head, confused but he shook it off.

☀︎☀︎☀︎

Y/N waved goodbye to her younger brother and his friend, Katsuki. "Kids are so cute!" She grumbles to herself as she pulled her [favorite color] hood up. Feeling embarrassed for imagining Izuku and Bakugo in little onesies.

"Snap out of it, Y/N!" The green haired girl slapped her cheeks softly. She felt a buzz in her pocket which she whipped out to see her mom was calling her.

Y/N answered and put her phone on her ear, "Hi mom! What's up?" She asked, walking to a huge park.

"Hey Y/N, did you drop off Izuku yet?" Inko responded with a slight worry tone. The teen giggled to herself and said, "Yes mom, he's fine! He's playing with Katsuki right now." She arrived at the park where couples and a few kids were playing or walking around.

"Oh, okay. I'm just making sure. So honey, how was your day?" Y/N sat down on a bench and gazed over at some kids playing at the playground.

"Good, why?" Y/N planted a small smile at them.

"I'm just worried that...you know...a-about your...quirk.." Y/N stopped smiling and was replaced with a frown.

"What do you mean? I know I'm quirkless. I'm just worrying about Izuku's." She began lowering down her voice.

Into heaved a small sigh and tapped her finger onto the dinner table, "I know, I am too. I was just thinking that...d-do you think I'm a good m-mother..?"

Y/N became a little more upset, "Of course you are mom! Don't say that. You're a really awesome mother. I knew that since I was in your womb!" After that sentence, Inko gave out a happy laugh.

"Thank you, Y/N. You really are the best daughter I could ask for."

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