First of all, a little disclaimer here: the story contains spanking of a child as a disciplinary method. Please don't read if you don't wanna see something like that. Also, just know that I never want this to happen in real life and I really do think that corporal punishments that are not happening consensually between adults actually suck.
"I don't want to be spanked!" the little princess cried, hiding her face all in tears in her father's silver mantle.
"You need to be spanked, my love," Thranduil retorted almost softly and stroked his daughter's blond head for a moment, before adding: "Every single child who stole important papers from their father's office and accidentally burnt them all, needs to be spanked."
"It sounds worse when you say it," Silivren snorted quietly.
"I don't think much worse," the king shook his head. "Dear little one, I worked so many days on every single word on them, and you just destroyed everything... So easily. I will of course write these all again, but it will be waste of not only my time, but the time of everybody in the Kingdom. Do you understand that?"
"B... But I didn't do it on purpose, Ada, I swear!.."
"I know, however you did it. Let's start with the fact that you took my thing without my permission! Is that acceptable, hmm?"
The elfling didn't say anything, she just lowered her head in grief and shook it, her little hands fumbling a button on her dress nervously.
"Do you understand why I have to punish you?"
"Y-yes, Ada."
"Then, go see your mother and ask for her maple hairbrush, change your clothes and come back here, will you?"
When Thranduil said about the hairbrush, Silivren sobbed quietly, but instead of objecting just murmured:
"I will..."
The next time she appeared in her father's office was about fifteen minutes later. The dress was replaced by a snow-white nightgown now, Silivren's hair was braided, and in her hands she held the required hairbrush, although she hurried to place it onto the desk.
"Come here now."
Thranduil took her hand gently but confidently, helped Silivren to lay over his knees and wrapped the hem of her shirt behind her back. The girl started sobbing again, just from fear of what was going to happen to her poor little bottom, but didn't try to run away, considering herself too adult to do such silly things.
"You're not going to touch anyone's things without their permission anymore, are you?" the king demanded and at the very same time gave her first few smacks. The little princess took these pretty bravely, but as her pale butt turned pink, she quickly loose control and started crying quietly, repeating endless sentences about how sorry she was, and that she was going to be a good girl, although nobody ever told her she was bad. Thranduil, however, continued spanking until his daughter's skin had a pretty bright pink pattern.
Then, he reached for the hairbrush.
By that time, Silivren was crying harder and louder, so the words were not really audible anymore, but he gave her a pause to calm down, and finally after a few minutes she said:
"I'm... I'm sorry so very m-much, Ada! Aw, it hurts... Are we going to finish, ple-ease?.."
"Yes, little thing, we're soon to be done: just six more left to go with this thing. I know you'll get it good."
Well, she didn't really, but Thranduil could never blame her for trying to escape from the stinging smacks of the hairbrush, as well as her loud and desperate crying that did not stop for a second before he finished finally.
But then, it was all over.
Still sobbing, Silivren got up from her father's knees slowly and hugged him as tightly as she could. So did he. Her bottom was just like on fire, but that was not really the matter if her father forgave her now... Well, almost.
"Ada..."
"Yes, dear little one?"
"You won't do anything to make it less... Unpleasant now, right?"
"No I won't, Silivren. I want you to remember this clearly at least tomorrow... But we also know that your brother will heal you no matter what I think about it, right?" Thranduil grinned, and his daughter smiled, blushing just a little bit.