Chapter Text
Izuku and Katsuki were having a sleepover at the Bakugo’s house. Masaru had left them alone so they could complete their bedtime routine.
Both boys thought it would be funny to play in the sink. They filled it to the brim, splashing water all over the floor. They added bubble bath after, causing the tile to become slippery.
The eight year olds used this to their advantage, pretending they were at an ice skating rink. Sliding all around the bathroom, both boys crashed into the shelving that held the towels and washcloths.
With all the noise, Masaru came in to see if the kids were okay only to find them misbehaving.
He hadn't been seen so he walked to the kitchen and grabbed a wooden spoon before making his way back to the bathroom.
When he reached his destination, he saw the boys on the floor spraying his shaving cream all over the place.
Pinching the bridge of his nose, he snatched Katsuki up since he was the closest one to him and yanked his pants and underwear down in one swoop. The boy’s bottom was wet due to all the water so this would make the spanking sting a bit more.
He brought the spoon down abruptly on his son’s sit spot’s, a shriek was pulled from the boy’s throat.
He continued to rain harsh cracks of the wooden utensil onto his son’s wet skin, making sure he covered the entire area, including his upper thighs.
Katsuki was dancing around on his toes, crying out with each one as Izuku watched with big eyes, knowing he was next.
Masaru finished up quickly, a few thwacks to each cheek before stopping completely. Katsuki was sobbing quietly, rubbing his red bottom with both hands before his father put him face forward against the wall.
He walked over to the other disobedient child, baring his bottom as well before he delivered the same punishment to his son’s friend.
He peppered Izuku’s bottom and thighs with hard spanks, giving him a few seconds between each one so the pain could sink in.
He bent him forward a bit so he could reach his sit spots since the boy was a bit shorter than Katsuki, making sure he landed harsher thuds of the spoon to the sensitive area.
Izuku was more vocal, howling out loudly not long after Masaru started.
He finished up, making sure Izuku’s skin was the same bright red color as his sons, putting him in an identical position as Katsuki up against the wall.
He went on to clean up the mess while the boys hiccuped and let out a few whimpers of discomfort as the peeked over their shoulders at the adult, wanting him to cuddle them.
After he mopped up the water, he pulled the boys to his chest and kissed their heads. Cooing softly into their ears as they apologized repeatedly, promising to be good.
He walked them to Katsuki’s bedroom, tucking them in onto their stomachs as he rubbed in some soothing cream onto their freshly spanked skin to make sure they could sleep soundly. Both boys were exhausted and fell asleep minutes after being put to bed, Masaru not leaving the boys side until he knew they wouldn't wake up again.
He snuck out, making sure to turn the lights out and went back to the bathroom to finish cleaning the mess the two troublemakers made in the first place.