I asked hangten33 for a prompt, and this is what he gave me. I did change a little bit of it, so it would still be canon compliant, but not a lot. Hope you enjoy!

Kensi and the Terrible, Horrible, No-Good, Very-Bad Day

Kensi suddenly shot out of bed, glancing at her clock, which was beeping shrilly, and had been for the last 20 minutes. She cussed, leaping out of bed, bare feet hitting the floor with a dull thump. She grabbed the clothes she had set out the previous night, rushing to the bathroom, stripping out of her pajamas and jumping into the shower.

5 minutes later, she was struggling to tug her jeans up her legs, her body still wet from her cold shower. Quickly fastening her favorite shirt, the pale blue button-up, she headed out to her kitchen, where she turned on her coffee maker, all while deftly plaiting wet hair into a tight French braid.

She tied off the braid quickly, then poured a cup of scalding hot coffee in a travel mug before sitting down at her kitchen table to pull socks over her toes and shove her feet into her boots. Her phone buzzed, and a text from Mindy popped up. She pulled the device from the table, reading the message.

'Happy birthday KayKay!' it read. Kensi sighed, tilting her head back exasperatedly. It was her birthday! How could she forget? What an awesome way to start it...

Kensi shook her head and growled, going back to getting ready. Badge and phone shoved in back pockets, she grabbed her keys and ran out the door and down the stairs to the parking lot, where she unlocked the driver's door of her old Chevy S10 and got in. Only having been at OSP for a month and a half, Macy wouldn't let her take the Caddi crossover that had been assigned to her from the motor pool home yet.

She peeled out of the parking lot, probably breaking a few traffic laws to get to work. Still very new and fresh-faced at OSP, she was trying hard to make a good impression. Which wasn't going to happen if she was late. She screeched to a halt at a red light, grabbing her coffee from the cupholder. Tilting it in order to take a sip, and the lid, apparently not screwed on, fell into her lap, and a sluice of hot coffee followed.

Kensi yelled in pain, quickly setting the mostly empty cup back down. She grabbed at her shirt, pulling it away from her skin, relieving the burning sensation. She whimpered in pain as she tugged the shirt over her head, tossing it to the passenger side floor, leaving her in a damp tank top. A horn honked behind her and her head shot up. The light was green.

"I'm going, I'm going!" she shouted, and received a rude gesture in response. She stomped on the accelerator, continuing on her way to work. She pulled up to the motor pool, parking her truck. She rummaged in the back seat, finding the duffel bag that held a change of clothes. She opened it and pulled out the only shirt in the bag, and ugly beige long-sleeve that was itchy and uncomfortable. She didn't even know wht she kept the thing. She stripped off her tank top and glanced at the damage. An ugly red burn, not too serious, but still very painful, marked her lower chest and stomach. She sighed, tugging her shirt over her head, then getting out and running to the door.

She glanced at her watch. 15 minutes late. Kensi cringed as she keyed in the code and the metallic gate screeched open and the elevator descended. Everything was quiet when she walked into the building, and she didn't see anyone in the immediate area. She slipped silently down the corridor, heading to the bullpen. Callen and Sam were already at the table, typing away at their computers.

"A little late, aren't we?" Callen quipped, raising an eyebrow. Kensi sighed, sitting down and tugging out her laptop.

"Sorry. Rough morning," she supplied, not in the mood to talk.

"Happens to all of us," Sam replied. Kensi gave a curt nod.

"I'm gonna go find some ice," Kensi said, standing back up.

"Ice?" Callen asked. Kensi tugged at the hem of her shirt, tugging it up enough to reveal half of the burn wound.

"Spilled coffee this morning."

"Ouch," Callen replied.

"Yeah," Kensi said, tugging her shirt back down, then heading in the direction of the small kitchen.

"You need to get that checked out?" Sam called after her.

"No, I'll be fine. Had worse." Then she disappeared from view.

"How was your weekend?" Sam asked once she returned, ice pack in hand.

"Fine," Kensi replied as she sat back down and positioned the ice across her torso, not looking at either of them.

"What'd you do?" Sam asked, genuinely trying to make conversation.

"I don't want to talk right now," Kensi snapped, scowling at her coworkers.

"Hey, okay then! Just trying to make conversation," Sam replied, holding his hands up defensively. Kensi scowled.

From there, her day only continued to get worse. First, Callen and Sam made her crawl beneath a house (because she was the smallest) to gain entry, second, her car got all shot up in a shootout, and third, she got the crap beaten out of her face while trying to fight a guy twice her size. She walked away with a split lip and black eye. It just was not a good day. To top it all off, no one at work had even acknowledged it was her birthday. She finally lost it when Callen asked her to go on an overnight stakeout with him.

"Callen, I am exhausted, sore, and just really don't want to do that," she protested irritably, scowling.

"I know you don't, I don't either, but it needs to be done, and it will be good practice for you."

"Callen, I've been with NCIS since '03, I know how to work a stakeout."

"Kensi, I'm not going to argue with you anymore. We are going on this stakeout and that is an order."

"No," Kensi said with a shake of her head.

"Kensi Blye, don't you dare walk out of here," Callen warned. Kensi didn't reply, just simply headed for the door. Callen went after her, grabbing her arm before she could make it out to the elevator. Callen didn't say anything, just walked her back to the bullpen to retrieve his car keys. "I'm taking her to the boatshed," he told Sam. "Meet you there?"

"Sounds good," Sam replied as Callen escorted Kensi away.

"You, little missy, are going to find out what happens to members of my team who do not behave," Callen said sternly as he closed the door to the interrogation room of the boatshed. Kensi's eyes were wide as she glanced around the room, looking anywhere but at Callen. Callen beckoned to her, prompting her to come stand in front of him.

Kensi scuttled closer, trying not to let her nerves show through her defiant expression.

"What are you going to do to me?" she asked, morbid curiosity getting the better of her.

"You, Kensi Blye, are going to get a spanking," Callen said pointedly. Kensi's eyes widened. She hadn't been spanked since she was twelve years old! She was much too old to be spanked!

"I'm way too old for that!" she objected, backing away from her team leader. Callen held up his hands.

"I'm not going to lay a hand on you unless you give full consent. However, this method of discipline is a one and done. Other forms are prolonged and drawn out," Callen explained.

"What's my other option then?" Kensi asked.

"Two weeks desk duty, total exclusion of active cases," Callen said sternly, knowing Kensi would not like that option. Kensi glanced down at her toes, pondering her options. Neither were very good, but two weeks desk duty sounded horrible. "It's either a sore butt and forgiveness now, or a very long, boring two weeks," Callen said. "Your choice."

Kensi took a deep breath and her cheeks grew red as she asked the next question. "You're not gonna, um, pull my pants down or anything?" After all, she didn't know Callen very well at all. No way he needed to see that.

"No, not right now," Callen said. "We're not there yet."

"Then you can do it. I don't want desk duty."

Callen nodded. "Alright, Kensi, come over here." Callen beckoned at her. He wasn't going to put her over his knee yet, that seemed too personal and Kensi was so new. He'd just use Sam's method; bending her over and snugging her up against his hip. But before that, his young agent had some explaining to do.

"First, I want to ask what got into you today? Is there something that's bothering you that I should be made aware of?" Callen looked genuinely concerned as he asked those questions, setting a hand on her shoulder. When she didn't say anything, Callen reached out and tipped up her chin, prompting her to look at him. "Kensi?" Kensi sighed.

"You know when you just have a day where nothing seems to go right? And it just gets worse with each passing minute?" Kensi glanced down at her feet, cheeks red as she tried to explain.

"Yes," Callen replied gently. "We all have those." Kensi continued.

"It's supposed to be a goodl day, but it just sucked. And now here I am, about to be spanked like a child, because I acted so stupidly and let my temper take over! My patience had just worn so thin, and then when you asked me to go on that stakeout, I just sort of snapped! I'd just had enough of today, and adding one more thing just seemed like too much!" Tears sprung to Kensi's eyes, which she angrily swiped away.

"Kensi, you should've told me! We could've worked something out!"

"I tried to! And you were just going to make me do it anyway!" Kensi retorted.

"You were rude and disrespectful in the way you said it, and then you disobeyed. Bad behavior is not rewarded around here."

"I'm sorry," Kensi replied. She had been pretty awful to her team leader, and then to run out on him like that? Ugh!

"Apology accepted," Callen returned. "Shall we get this over with?"

Kensi nodded.

"Alright, missy, why are you getting this spanking?"

"Do I really have to answer that?" she asked, a spark of irritation bubbling up inside her.

"Yes, you do. I need to know that you understand what you did was wrong and don't think that I'm unfairly handing out discipline." Kensi nodded. That did make sense.

"Because I disobeyed an order and didn't go with you on that stakeout," Kensi said, slightly pouting.

"That's right. You know very well that disobeying an order can be a serious offense. Don't make a habit of it."

"Yes sir," Kensi replied with a nod.

"Okay, here's what I'm going to do," Callen began to explain. "Come over here, to my left, and bend over. If I get backtalk or out of control behavior, this will only be prolonged. Understood?"

Kensi nodded. "Understood." She then did as asked, cheeks and ears flushed bright red as she did so. Callen tugged the hem of her shirt up her back a ways, then wrapped his arm around her waist, snugging her up against his hip. Then he drew his arm back and brought his hand down hard on her jean-clad backside. Kensi jerked a little, and sucked in a sharp breath. That hurt!

Callen continued to rain down sharp smacks, creating a very strong sting in her backside. Kensi whimpered, squirming in his grasp, as Callen aimed lower to her sit spots. Tears sprung to her eyes as the pain was drilled deeper and deeper. She had really underestimated how much this would hurt. And not just the physical pain, but the emotional pain. Her guilt weighed heavily on her heart. How could she have been so disrespectful to her team leader?

A particularly hard smack to the center of her bottom shook her from her thoughts and she squeaked. Callen repeated the swat and Kensi couldn't help but wonder how red her butt would be by the time this was over. She wiggled, shuffling her feet in a vain attempt to get away.

"Hold still," Callen ordered, tightening his grip on her waist.

"No!" Kensi ground out, thrashing in his grip.

"If you don't hold still I'm going to put you over my knee like a child!" Callen warned, tightening his grip even further. Kensi stilled immediately. She did not want that.

Callen then laid 6 scorching swats to the backs of her thighs, sending tears streaming down her face.

"That's for backtalk," Callen said. Kensi whimpered. "You're doing good, we're almost done," he said. And true to his word, they were. Ten hard, final swats later, Callen was letting Kensi up and she was standing in front if him, sniffling. Her hands went back to rub her bottom, but Callen stopped her. "No rubbing."

Kensi scowled at him.

"Lesson learned?" Callen asked, reaching out to rub away tear tracks with his thumb. Kensi smiled a little. The loving touch felt good. She nodded contritely, sniffling a little as Callen drew her into a tender hug. "Good girl." He patted her back before pulling away. "If something's ever bothering you, you come talk to me, or Sam, okay? We'll always be ready to listen, got that?"

Kensi nodded. "I'm sorry, Callen," she said.

"I know you are. And it's all over. You're forgiven and we won't speak another word of it." Kensi smiled at that. Forgiveness felt good.

"What a crappy birthday," Kensi muttered, scrubbing at her cheeks. "Some gift," she said with a snort, reaching back to rub her bottom.

"Kens, it's your birthday?" Callen asked, ignoring her rubbing for the time being. "I had no idea!"

"27 today," Kensi said with a weak smile.

"Well happy birthday," Callen said, squeezing her hand. "Sorry it wasn't the greatest day."

"Thank you. I'm sorry I was so awful."

"All's forgiven now, kid. Forget about it. Now we need to go meet Sam and finish our mission," Callen said.

"Do we have to?" Kensi asked. Having to sit in a car on a sore backside for hours did not sound fun.

"Is that a whine I hear?" Callen asked, sternly yet playful, raising a finger at her.

"No," Kensi replied, an impish smile creeping to her face despite her discomfort.

"Good," Callen said with a grin as he opened the door. "Let's go."

"Yes, sir," Kensi replied, trotting out in front of him. Callen tousled her hair affectionately as they headed out to the car. Kensi would be a very good agent, Callen surmised. A very good one indeed.

As usual, it's super late and I'll do edits in the morning. Hope you enjoyed!

Alright, edits have been made!