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Izuku tried to ignore it, he really did. And he was successful... until it was glaring at him and he couldn't ignore it anymore. He yearned for the way Aizawa ruffled Hitoshi's hair, he wished it was him being done that. He yearned for the way Yamada seemed to always have a packed bento box for Hitoshi at lunch and ask him to chat. What was the difference between him and Hitoshi? Why was he being treated differently?
He knew the answer. Aizawa and Yamada adopted him when he was just six. His mother and he went out for shopping when a villain attacked and they happend to be in the wrong place at the wrong time... she didn't make it. Izuku was placed in a foster home under emergency foster licenses of heroes. The heroes were Aizawa and Yamada. One thing led to another and he still lives with them seven years later. But it feels like they adopted him out of obligation. As a foster they forgot about him after awhile and by the time they remembered his again Izuku had lived in their house for way too long. It would cruel to send him away, so they adopted him. They were never really around and he always thought it was because they were too busy. He tried to lie to himself that the reason they didn't come for parent teacher conference in middle school, it was because they were fighting crime. The reason why they forgot to pick him up after school, it was because they have to protect and guard the city. This went on until high school... until that illusion shattered when Izuku saw how his parents took a liking to Hitoshi. How they always had extra time to hangout with him. How they suddenly had extra time to make lunch for someone else.
Izuku couldn't say he was jealous because he wasn't close to his parents, but he was hurt. He now saw clearly with no excuse with no illusion that Aizawa and Yamada didn't like him. He might have shed a few tears but who would know that? Izuku didn't hate his parents. They made sure he was well fed, bought good clothes and get a nice education. He life was going good because of them so as long as they didn't throw him out he wasn't disliking the situation. And Izuku saw how Hitoshi held himself. He saw the bruises on his skin, the ones he desperately tried to hide with clothing. How skinny he is... the sickly kind of skinny. So he didn't want his parents to stop paying attention to Hitoshi, but there was something deep inside him that wondered why couldn't you do that for me too?
Although used to the affection given to Hitoshi, he was kinda surprised when he came home one day to find an extra pair of shoes on the doorway... next to the rarely-there shoes of his parents. Walking deeper into the house he found Yamada in the kitchen cooking. He had a big smile on his face as he talked with Aizawa and Hitoshi, who were sitting at the dining table. They looked carefree... like a family. It didn't help that Hitoshi looked somewhat like Aizawa.
The moment they noticed Izuku, the kitchen went quiet and tense. They suddenly looked awkward... like they forgot that I lived here too. Letting out a sigh Izuku went to his room, he knew they didn't make plans that include him so why intervene where he was not needed.
Izuku heard the chatter of the trio resume as he shut his door. He had already come to terms that he will never truly be their son and Aizawa and Yamada will never truly see him as their son either. Izuku went on with his routine and went to bed. Although hungry, he didn't want to go back to the kitchen. There was no need to remind him that he was rejected.
As his room was engulfed with the darkness of the night Izuku blamed the sting in his eyes as allergies. He hadn't already come to terms with everything. The laughter of the trio in the kitchen was drowned by the late night traffic outside Izuku's window as he fell asleep.