Warning for the end of this one!! Spanking! This one takes place when the boys are kids, and I know there is an age discrepancy between this and the series. Get over it.
"You know this is actually a pretty good idea...for a hanyou..." The young heir said looking down at his younger brother.
"Of course it is Sesshomaru-kun!" His whelp of a brother said.
"Shush before someone finds us, it was hard enough sneaking away from that ridiculous dinner party," he rolled his eyes.
They slipped into Manten's guest room and looked at the vile smelling cauldron in the corner of the room. Manten, the thunder demon, was trying to perfect a tonic to make his hair grow longer. The vile that was hidden in his little brother's haori would change the potion so that it would cause him to go completely bald.
Inuyasha and Sesshomaru had snuck away from their father and the thunder demon's alliance dinner party. He climbed up the ladder that connected to the pot's rim, Inuyasha was right behind him. He pulled his little brother up and held his up over the potion so he could pour in the other ingredient.
Unfortunately his brother was a somewhat uncoordinated pup and slipped pulling them both into the cauldron. Sesshomaru felt a tingly sensation on his scalp and felt his head where his previously short hair had been. He looked to see that Inuyasha also had long hair now.
"Shit!" the heir quietly cursed and pulled himself and his brother out of the sticky slimy concoction. He yanked the vile from Inuyasha and poured a blue liquid into the disgusting grey mass of goop.
He plopped Inuyasha on the floor and stirred the disgusting mass a few times before his keen hearing picked up on footsteps and voices. He quickly grabbed his whelp brother again and pulled him under the bed just as the door opened.
"Sessh-" Inuyasha started.
Sesshomaru quickly slapped a hand over his mouth. The door creaked open and Manten's heavy footsteps were heard and seen. He walked straight to the cauldron and a few drips of the disgusting goop dripped onto the floor as the thunder demon put it into his hair. Sesshomaru took advantage of him being distracted and ran out of the room pulling his brother with him.
He quickly took his brother back to the nursery where all the other young pups were and told the servant there he had gotten into a flower patch at the garden and needed to be cleaned up so he could return to the dinner party.
The nurse was new so she thought nothing of the newly long hair on the 7 year old Inu youkai, and though it was obvious that he hadn't been in a flower patch she didn't question the lordling.
Sesshomaru went to his room and quickly washed and changed, meeting his brother back at the ball room. They stood near their father and mothers and heard a scream. Manten came running into the ball room with tears streaming down his face and only three hairs perched atop his head.
"Inutaisho!!!!!!!!! MY HAIR IS GONE!!!!!!!!!!" Everyone in the room either started laughing or gasped.
Sesshomaru on the other hand did neither and was immediately singled out by Manten, "You! You did this! You obnoxious, evil little mutt!" He pointed at Sesshomaru.
Inutaisho and Akina (we're gonna give Sess's mom a name) moved Sesshomaru behind them and Izayoi picked up her son as well. Inutaishio stood to his full height and towered over the pudgy frog like demon.
"You have accused my son with not a shred of evidence to prove what he did," he got a cold look on his face.
"Look at their hair! It is at least five times longer than it was when they first came into the ball room this evening!!" Manten shrieked getting red in the face.
Inutaisho looked at his sons and took both by the back of their kimonos. He quickly walked out of the ball room leaving his two wives to ponder their sons' punishment. Inutaisho took them into his older son's room and sat them both on the bed, "Boys!" He said expecting an explanation.
When neither boy responded he picked up Sesshomaru and laid him across his knees. He pulled down his hakamas and gave him a spanking he'd never forget. When Sesshomaru had tears in his eyes and a fire red back side the youkai lord took his youngest son and gave him the same punishment. The boys' pleas of forgiveness were heard throughout the manor and their mothers winced knowing neither would be able to sit down for a while.
The lord left them in Sesshomaru's bedroom and stormed off, his alliance with the thunder demons now ruined. The two brothers for the last time curled up together whimpering in pain and taking comfort from the other.
The next morning Sesshomaru was chasing his little brother around the manor blaming him for
coming up with the prank in the first place. He was twelve and he hadn't been spanked since he was at least Inuyasha's age, so he blamed the pup for putting such a dent in his pride and dignity. Even the castle imps were snickering at him when he walked past. And so begun the start of Inuyasha and Sesshomaru's current...eh ...relationship...
