Disclaimer: I do not own My Hero Academia or Solo Leveling.

Please excuse my wrong grammar and limited vocabulary.

Izuku open his eyes slowly and was immediately bombarded by the sunlight passing through his curtain. He tried to move but felt a weight that was pinning his right side. He looked down to see a familiar light green hair that was resting on his chest, her arms wrapped around his waist, and he could feel her legs tangled around his under the blanket.

Izuku move his left arm to move her hair to the side and looked at her. Izuku smiled at her face sleeping peacefully. Thinking if he should wake her up, Izuku opened his inventory and took out his phone to look at the time. It was 7 AM.

Izuku raised an eyebrow, normally, Aico would have been the one waking him up. 'She's still having trouble sleeping, huh.' He decided to stay and wait for Aico to wake up until 9 am.

Izuku raised his right arm to bring her closer and kissed her forehead. Then suddenly, an idea came to his mind. He grinned to himself and pulled out his phone from his inventory. He opened it and pressed the camera app, he faced it towards Aico and took a picture of her sleeping. Then he brought it up in a selfie and kissed her forehead while looking at the camera and hit the capture button. He looked at it and smile.

Looking how beautiful she is, Izuku thought that if she wasn't her sister then he would have courted her by now. He remembered people being nice to him to get Aico's attention, but it always ended up Aico ignoring them, knowing that they are only patronizing her brother.

Aico shifted a little bit which brings Izuku's attention to her. She was now resting on the crook of his neck, her lips grazing his lower neck ever so slightly. He could feel her warm breath brought a tingling sensation through his spine, her nice firm middle schooler breast pressing on his right side. Izuku felt something wet from his right leg and hope to god that (if there was any) to make the bullshit on his mind a reality.

Izuku tensed up and with his left hand, slowly lift up his blanket. What he just saw broke his mind. Izuku dropped the blanket and his left arm stayed, as if he was frozen. Then, his mind rebooted and information came running in his mind. As he processed everything, his face became redder and redder, and there is only one thing that is on his mind. 'Why the fuck is she wearing a fucking black lingerie!'

While Izuku was struggling to keep his mind from blowing up, Aico shifted again, and as if she was aiming to seduce him, her lips are now pressed against his neck, as if she was sucking on his blood. Izuku's spine shivered, he could feel himself getting an erection. 'What the fuck is wrong with me! I'm a failure of a brother.'

But that's not all, like something from out there was playing with Izuku's dignity, Aico's braless breast pressed even more to his side. He could feel that her nipple was fucking hard! 'What the fuck is going on in her body!'

Then her legs moved up and was now straddling his waist, her leg resting on his growing erection. And the growing wetness from his side was not helping. 'What the fuck?! Is she dreaming? What kind of dream is she having to get this wet!'

Izuku moved his right leg and unintentionally pressed it against her crotch that caused her to moan. Oh, her sweet and innocent voice. Hearing her moan on his neck was the last straw. He couldn't take it anymore, letting her sleep more was a bad idea. He did his best to control himself.

Izuku scooted to the left to get away from her without waking her up. but him moving caused his right leg to grazed her sensitive crotch and made her moan louder than before. The moan caused him to stop on his tracks. His gaze turned to her face, looking at her hungrily. And for a second he lost himself and was approaching her, then he snapped out of it by slapping his face, but not loud enough to wake her up.

Izuku reached for the edge of his blanket and slowly take it off them, exposing his erect wood that strained his boxers and Aico's black lingerie with a wet stain on her womanhood. Izuku stared at it and unconsciously licked his lips. He slapped himself again while berating himself quietly, "No! Bad Izuku! She's your fucking sister for Christ's sake!"

Now that his leg was free from her, he slowly lifted her hands that was on top of his chest and placed it on her side. He sighed; he could feel his erection straining his boxer. Izuku slowly got up of his bed and went to the bathroom to handle some business.

He opened the bathroom door and went inside. He looked at the strain his dick is causing and saw a wet spot on the tip of where his dick is. He sighed and ignored it for now. Izuku looked at himself from the mirror. "I can't do it, dad." He said his voice sounded disappointed, to himself.

He opened the faucet and formed a cup with his hand and filled with the running water and splashed his face with it. He did these multiple times as he remembered his father talking to him before he left years ago.

FLASHBACK.

Hisashi noticed something between his children. when were little Aico and Izuku will always play house together, Izuku is the father, and Aico will be the mother. Ever since then that Hisashi noticed that this wasn't a game for Aico.

Both children didn't know about it but when Izuku was two years old, he and Inko tried to make another one hoping the get a girl this time.

The couple always dreamed of a family consisting of 2 boys and 2 girls. but, after a month, when Inko is not showing any sign of being pregnant, the Midoriyas decided to visit their doctor. But what the doctor said broke their dreams.

"I'm sorry Mrs. Midoriya. But it seems that your firstborn was a gift from what's above." The doctor said.

Inko started shaking, her doubts coming to life. "Wha-what do you, m-mean doctor?" Inko said gripping her husband's hands tighter.

The doctor sighed and looked at her apologetically. "Mrs. Midoriya, I'm sorry but, you're a barren. You are incapable of producing another offspring. That said, having your firstborn was a miracle."

After that, Inko fell into depression for a month, and his love for Izuku leveled up. (LOL) a few months after that Hisashi proposed that they adopted another one which Inko gladly agreed, and that's where they got Aico. when they saw her profile, they knew she was the one. The light green hair and lime green eyes, she is perfect for their family.

When they asked about her, the caretaker said. "Her mother died giving birth to her and her father died 3 days after that in a car accident, the autopsy said that he was intoxicated." Hearing her story, the adult Midoriyas was determined to give this child the best life they could give. She was only a half a month infant; her parents weren't able the give her a name. but her mother's name was Aiyenn and that's what they called her in the orphanage, but it wasn't final. When they asked her what her new name would be, Inko combined her (she was referring to Aico) mother and her future mother their names which lead to Aico.

And that leads to where there are now.

Hisashi sighed, he and Inko thought that something like this would happen. They both agree that if Aico wanted to pursue Izuku, and Izuku agreed to it, then they would tell her the truth about her past.

It was 2 years ago when they started noticing Aico's attraction towards Izuku. And because of Inko getting hospitalized, Aico's only comfort was when she was with Izuku. This confirmed his suspicions. He can't tell Aico now, but he is going away soon.

Hisashi waited for Aico to go to sleep, then called Izuku and told him everything. But little did they know, that someone was listening, she didn't hear the whole story but she got enough context that she, and her brother are not blood-related. Instead of lashing out for lying to her, what she found was a relief.

FLASHBACK END.

Ever since that day Izuku never looked at Aico as a sister, he started looking at her like a girl and now she is turning in to a woman.

"rraaaaargh!" He ruffled his hair and splashed himself with the water again.

"I-i-I can't do it, dad! I-I can't hold back any longer."

AN:

Holy. SHIT! WOOOOOOO!

This was only supposed to be an omake what the hell? But there you go chapter 9 it's the shortest by far. Hoped you enjoyed this. I got this idea while reading a hentai, I don't remember what it is but it's not incest. Its about two childhood friends living together in a dorm lol.

I did plan for her to not be blood-related though. But I didn't want to make it weird so I ended up revealing my plans for her. BUT this doesn't mean they would be together from now on. That's all I'm gonna say.

Annnnnd I wanted to get this out of the way. About the replacement for Iron, I want you guys to guess who it is. The clue is someone that would stab him in the back. And he is not a villain.