Chapter Summary: Mokuba Kaiba is lactose intolerant and makes a very poor decision.

Author's Notes: since i am a person cursed with food allergies, and i have friends who are cursed with seasonal allergies, sometimes we get together and headcanon jam about our favorite characters having allergies so that we can relate. and thus, lactose intolerant mokuba was born.

Mokuba Kaiba's Unremarkable Collection of Mundane Moments

Chapter 1: Mokuba Kaiba Makes a Dreadful Decision

The second the door to his study creaked open, Seto was able to recognize the sound of a metal spoon scraping against a cardboard container, a tell-tale sign that his little brother was doing something incredibly stupid.

"Hi, nii-sama!" his younger brother chirped. Seto could see the spoon hanging out of his mouth from the corner of his eye.

"Mokuba," he said, without even looking away from the computer screen, "You'd better not be eating what I think you're eating."

"Wow, good morning to you too," Mokuba said. Seto could hear the spoon clink against his teeth as he spoke.

The younger Kaiba plopped into the extra rolling chair by the window, shoving another spoonful of ice cream into his mouth. Then another. And another.

Seto stopped typing. "Mokuba, you are going to be sick. Furthermore, why are you eating ice cream for breakfast?"

"Oh, like you're one to talk," he tapped the spoon against the side of the container, "You don't even eat breakfast. You wouldn't eat at all if I wasn't here to remind you."

"Yes I would."

"Nii-sama, please."

Seto turned his attention back to his computer screen, and Mokuba smirked, taking his older brother's silence as a victory. They stayed quiet for a while longer, the spoon against the bottom of the ice cream container the only sound breaking the stillness. One minute passed. Five minutes. Ten.

Seto looked up from the computer screen for the first time all morning. "How much of that have you eaten?"

Mokuba shrugged, leaning against the back of the chair, spoon hanging out of his mouth again.

"That container was full yesterday."

He shrugged again.

"Did you even take your lactase tablets first?"

The chair rotated gently, turning the younger Kaiba away from his brother.

"Mokuba."

He let the chair spin slowly until he was facing Seto again. "Oh, c'mon, nii-sama, I'll be fine," he said with a wave of his hand. He tapped his foot on the ground to keep the chair turning.

Seto sighed and shifted his focus back to his computer. "All right. Suit yourself."

"Ughhhhh..."

Seto glanced up at the sound, looking over to where his brother lay on the floor, clutching his aching stomach. The younger Kaiba was sprawled out on the carpet, gazing mournfully at the ceiling. The chair sat abandoned by the window, still spinning ever so slightly.

"Ughhhhhhhhh…"

Seto looked back to the computer screen. "I hope you don't plan on lying on my floor all day."

Mokuba tilted his head to the side to stare up at his brother, his long hair falling over his face. He huffed loudly, then let his head roll back to look at the ceiling again. "Nii-samaaaaaaaaaaa."

"Yes, Mokuba?"

"I think I'm dying."

"You are not dying."

"Why didn't you stop meeeeeeee."

Seto gave Mokuba a withering look, but stood up, stretching before leaving the room to get his idiot little brother some medicine.

"It's a good thing I love you," he grumbled under his breath. On the carpet behind him, Mokuba smiled.

Author's Notes: oh man, when i wrote this originally like a month ago, this was the first time i'd ever referred to seto as "seto" and not "kaiba". it was so weird. to this day i still need to proofread carefully to make sure i dont accidentally call him "kaiba" in any of this fic's chapters.

thanks for reading!

–fearowkenya