!!TW!! Descriptions of starvation/spoiled food/neglect/poor eating habits/disordered eating, panic attack
Sanemi sighed as he walked down the hallway, almost biting off Zenitsu's head when he bumped into him. His only saving grace was that Sanemi had better things to do. Like drop off these paper copies and check on his baby brother. Hopefully Kagaya hadn't gotten too attached, Sanemi wasn't looking forward to tearing his brother away from his boss. The man had way too much of a bleeding heart.
Rounding up on the teacher's lounge he groaned as he came to the conclusion that his coworkers had not calmed down in the slightest. They had all gone into a frenzy when Sanemi walked into the office, announcing that he had brought his brother for the entrance exam. Mitsuri had demanded that they get to meet the boy immediately so she could hug him, which Sanemi wasn't too keen on. Tengen had also demanded to see the boy, his reasoning being that he had a present for him. Which Sanemi was also not sure on. For good reason.
Sanemi could hear Mitsuri and Obanai bickering while Tengen laughed. The man had been surprised when Shinobu had spoken, voice determined and a little pained. The voice that answered, however, surprised Sanemi even more. The breathy, gravely sound so familiar to him at this point that he would recognize it in his sleep.
"Sorry, my name is Shinazugawa-"
Sanemi quickly slammed open the door and sure enough, his baby brother stood right in front of him. His head was lowered, eyes more focused on his feet than the people in front of him and his whole body was tense. Everyone's eyes snapped to Sanemi but he only cared about one person.
"Genya?" He couldn't help it when his heart melted at the relieved face his brother gave him. The boy shuffled over to his older brother quickly, eager to get close to him and away from the people that stared a little too much. Sanemi's coworkers were silent as the man patted the child's head in greeting. "What are you doing here? I thought you'd still be with Ubuyashiki."
"He brought me down here so he could grade my exam." Genya stood a little behind Sanemi as the others still stood silently, eyes wide and mouths agape. "He said you'd be here."
"Wait, you finished it already?" Sanemi's eyes pinched as he thought back to that huge packet of papers. He figured that Genya would still be finishing it up. "Damn, you're quick."
"I guessed on most of the math section." Genya couldn't stop himself from shrugging bratily as his brother huffed. He quickly shrunk under the silent surprised gazes of the adults staring at all of them. Sanemi shot his coworkers a violent glare as he gently guided his baby brother to his desk, making him sit in his office chair. He could practically hear Mitsuri holding in a squeal as she clung to Obanai excitedly. A big grin started growing on Tengen's face as he stood from his desk to get a better look. But it wasn't any of them that said the first word, in fact, it was Giyuu who had been silently working in his corner of the office.
"So that's your little brother, Shinazugawa?" Giyuu's cold eyes glanced down at the boy before looking up at his coworker. "He doesn't look anything like his contact photo."
"Well duh, that picture was from 4 years ago you absolute idiot." Sanemi growled at the man as he set down his papers. "What'd you expect him to do, not fucking grow?"
"I can't take it anymore!" Mitsuri squealed as she jumped closer, practically vibrating as she looked at the two brothers. "So this is your baby brother?! He's Genya?!"
"Well, yeah-"
"Oh my god and he calls you 'Nemi' , that's so cute!" Mitsuri laughed as she smiled at the boy, who only seemed mildly shocked at the attention. "Look at his cute little face, he's all squishy and puppy-eyed! Oh my god Sanemi, I think I'm gonna die!"

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Everchanging
FanfictionSanemi has to take custody of his younger brother, Genya, after his father goes too far. After not seeing his baby brother for almost 4 years, can he reconnect with him? Even if he barely recognizes the boy? {Cross-posted on AO3 under MultiGoddess} ...