Disclaimer: I don't own The Hunger Games or the characters.

Author's Note: Happy Halloween everyone! I figured I would give everyone a little treat with a special Halloween one shot of Late Night Calculations. Thank you again to Kismet for all of her assistance with these, you make me a better writer, you rock! Also thank you to all of you who are reading this, I am thrilled that you guys like them. Enjoy!

Warning: Rated Mature for sexual situations and scenes!

"Are you ready yet? We're going to be late." Peeta called out to Katniss. He was waiting in the living room for Katniss to finish putting on her costume for his office Halloween party. Katniss had kept her costume secret insisting that she wanted him to be surprised. Now Peeta was pacing back and forth while she finished putting the final touches on.

"Ok, ready." Peeta turned to see Katniss standing in the doorway from the bedroom. Her hair was tied up and she was wearing a navy blue suit, with a white button down shirt and his blue tie that was her favorite.

"So, what are you supposed to be?" Peeta asked as he walked closer to her. She pointed to her chest where she had a sticker placed on the outside of her suit jacket. The sticker read 'Hello, my name is: Peeta Mellark.' Peeta laughed jovially. "I see, so you're me."

"Yup, and I am even anatomically correct." Katniss moved the bottom of her jacket so Peeta could see her crotch where she had a rather impressive bulge. "I stuffed a rolled up pair of tube socks down my pants."

Peeta laughed even more, "Well, I appreciate the compliment, but I think you are overstating things with the tube socks." Peeta leaned in and kissed her quickly on the lips. "So, shall we?" Peeta motioned towards the door.

"Yeah, but what exactly are you supposed to be?" Katniss took in Peeta's costume. He was wearing dark grey slacks and a light grey button down shirt.

"Two shades of grey."

"Isn't the book, called '50 Shades of Grey?'"

"What can I say? I'm not nearly that complicated." Peeta answered with a smile that earned him another kiss from Katniss. This kiss lasted longer than the last one. It started soft, but Katniss pressed into it. She parted her lips and ran the tip of her tongue along his lower lip. Peeta opened his lips allowing Katniss to push her tongue in. Their tongues slowly caressed each other as the kiss began to intensify. Finally Peeta pulled back a little and bit her bottom lip lightly before pulling completely away. "Come on, we gotta get going."

The party was being held at Peeta's office building and it was quite the affair. His company prided itself on throwing the best possible parties. The desks were cleared out of the center part of the office, decorations were put up by a professional company, and there was a DJ. The liquor was all 'top shelf' and the party was catered by a famous chef. It was nice but not Katniss' idea of a great time. She always felt awkward at big social events like this. She wasn't a fan of small talk, and Peeta had to 'make the rounds.' So she had wandered over to the bar to get another drink. While the bartender was getting her beverage one of Peeta's co-workers walked up to her. He was a tall blonde man, not unattractive, but he was exuding a certain arrogance that Katniss had no patience for. He was dressed as Julius Caesar, and made no effort to hide the fact that his eyes ran up and down Katniss' body.

"Hi, I don't believe we've met. My name's Cato, and you are?"

Katniss looked him over quickly and responded dryly, "Well, I am wearing a name tag." Cato looked at the sticker Katniss was wearing and actually smiled in a way that, in Katniss' opinion, made him look even cockier, if that was possible.

"Oh, so you're Peeta's girl."

"Why would you say that?"

"Well, why else would you be dressed as him?"

"No, I don't mean why would you think I was with him, I mean why would you say I'm 'his girl?'" Katniss gave him a mischievous look. "Maybe Peeta is my boy."

"So I see you've met Cato." Peeta said as he walked over and put his hand around Katniss' waist.

"Hell of a girl you found here, Mellark." Cato licked his lips. "I wouldn't let her out of your sight, she's a real spitfire." With that Cato nodded at the pair and walked off.

"Yeah, your co-worker is a tool." Katniss rolled her eyes as she turned back to the bartender to get her drink.

"True, but he was right, you are a spitfire." Peeta leaned in and kissed the top of Katniss' head. "Look I just have to go talk to my boss for a little bit, and then we can take off. Do you want to come with me, or hang out over here?"

"Mr. Abernathy?" Katniss scrunched her face up. "I hate that guy, he always calls my sweetheart. I mean come on buddy, it's not 1965 and you aren't part of the cast of 'Mad Men.' Put the scotch down, and call me by my name."

"So I take it that means you are going to hang out here." Peeta chuckled. They were both facing the bar, and Peeta knew no one could see their fronts so he let his hand drift to the front of Katniss' pants. He lightly ran his finger up and down the rolled up socks in the crotch of her slacks. "You know, after the party we could go home and have a little fun."

"Peeta, they're socks, so you know that does nothing for me, right?"

"You say it does nothing, but the large bulge in your pants says otherwise." Peeta said with a wink. Katniss chuckled as Peeta excused himself and walked over to Mr. Abernathy leaving Katniss to find something to occupy her time. She wasn't interested in chatting with anymore of Peeta's colleagues. So she wandered over to his office. She walked over to his desk, turned the light on and sat in his chair. She scanned the top of the desk that was mostly empty with the exception of the desk lamp, a pad of paper, a pen and a calculator. She reached over and punched a few of the calculator buttons causing the numbers to print on the tape. She smiled realizing that this may be one of the most childish ways she could have found to amuse herself.

"Having fun?" Katniss was startled by Peeta's sudden appearance in the office doorway. "You know, with the suit you look like you could do this job."

"Ha! Yeah, up until people realize I suck at math."

"Eh, the calculator does most of the heavy lifting." Peeta thought for a moment, and then smiled. He stepped into his office and closed the door.

"What are you doing? I thought we were going to go now?" Katniss gave Peeta a quizzical look.

"I was just thinking maybe before we go we could do little, reenactment." Peeta flashed Katniss a wicked smile, before turning around and locking the office door. "Not making that mistake again." Peeta then walked in front of the desk, and Katniss made a move to get up. "No, stay where you are."

Katniss raised an eyebrow, "Okay." She sat back down behind Peeta's desk as he sank down to his knees in front of the desk, then crawled into the foot space underneath the desk. "Oh I see, a reenactment huh?" Katniss smiled at the blonde man on his knees in front of her legs as she remembered not so long ago when she was in that exact same position. "So I take it that in this scenario I'm you, and you are me?"

"That's my thinking." Peeta answered as he ran his finger tip up and down Katniss' calf.

"Well then if we are doing this reenactment correctly, I should be protesting the wonderful advances of the remarkably seductive woman offering to take me to new levels of orgasmic bliss." Katniss said with a smile.

Peeta laughed a little, and then looked up at the woman grinning back down at him. He was always amazed how truly and utterly smitten he was with her. He moved his hands to her knees and slid his palms up her thighs until he reached the belt buckle at her waist. He unbuckled the belt and then unbuttoned the top of her pants. He pulled the zipper down revealing the socks and Katniss' white cotton panties.

Katniss saw what Peeta was looking at, "So Peeta, spit or swallow?" She meant for it to sound playful, but she was getting so turned on that it came out as a breathy question.

Peeta laughed a little, then removed the socks and tossed them into the corner.

Peeta quietly pulled at the slacks, so Katniss raised herself up off of the chair allowing him to slide her pants off. Then Peeta pulled at the elastic band of her panties, sliding them past her knees to join the pants in a pile on the floor. Katniss felt the leather of the chair on her bare skin as she lowered herself back down. Peeta then gently pried Katniss' knees apart. "Hmmm. I think this reenactment was an excellent idea." Katniss moaned out as she felt him kiss the inside of her knee. He slowly worked his way up the inside of her thigh, placing gentle kisses along the way. "Oh, Peeta." When he was inches from her core, he gently nipped at the soft flesh of her inner thigh causing Katniss to make a sharp gasp. He extended his tongue and trailed the tip from the spot he bit her to the place where her thigh joined her body. He could feel the heat coming off of her center. He leaned in and kissed her folds, and let his nose slightly nuzzle the bundle of nerves at the top. He could feel the silky liquid on his lips and smell her musky scent. Peeta licked his lips and paused for a moment to taste her. Then he trailed his tongue up and down against her. Slowly, and gently his slid his tongue in just a little, then lapped upwards rubbing her nub with the flat of his tongue.

Katniss moaned loudly. She had forgotten any thoughts of the party going on just past his office door, all she could think about was how amazing his tongue felt as it caressed and moved against her. She rolled her head back against the chair and closed her eyes. He pushed his tongue deep inside her this time and she almost cried out, but somewhere in the back of her mind she remembered that she shouldn't make too much noise. Oh god how could she stay quiet though? She felt a tightness beginning to form beneath her naval and began to buck her hips in time with Peeta's tongue.

Peeta moved his hands behind Katniss and grabbed her ass, pulling her closer to him as he moved his tongue further inside her. He felt her squeeze in against his tongue and heard her moaning mix with the muffled sound of music coming from the party carrying on outside. He continued to dart his tongue in and out. Every so often pulling it out fully to trace her swollen lips. Then he pulled his tongue out and moved his concentration to the spot he knew would push her over the edge and moan his name. He started gently, just lightly flicking with his tongue. He could feel Katniss' ass tense in his hands. Then he started moving his tongue in tight circles around her most sensitive spot. He began increasing the pressure against her as he placed his lips around the area.

Katniss could barely stand it. Her muscles were tensing and she felt the need to explode with every flick of his tongue. She grabbed the back of his head and pulled his face in even closer. She moved her hips, rubbing herself against his tongue. "Oh, Peeta." She moaned. She was losing track of where they were, and losing herself in the feeling. She picked up the rhythm of her hips, and Peeta matched the pace with his tongue. She bit her lower lip to try to keep from screaming. Then she felt it. She cried out, completely forgetting about the party full of people just outside the door. She didn't scream his name, or any word really, she just cried out. She didn't let go of Peeta's head, and he kept lightly massaging her with his tongue as she rode wave after wave of her orgasm.

Her thighs clamped tightly to either side of his head and all he could hear were Katniss' cries and blood rushing in his ears. He kept licking and kissing lightly until he felt her muscles slowly start to relax as she came down from her high. She let go of his head, and her hands fell to her sides as her whole body seemed to melt fully into the office chair. Peeta looked up at her. Her hair was a mess from rubbing against the back of the chair, and her shirt was completely disheveled. Her eyes were closed and she was panting heavily. He smiled at her and asked, "So I take it that was ok?"

Katniss opened one eye and looked down to see him smiling at her. "Oh don't give me that dopey grin Mellark. You know I never have any complaints about your, oral skills."

Peeta chuckled as he crawled up out of the foot space. "Think anybody heard us?"

"I can tell you I hope that guy Cato heard us." Katniss stood up and started putting her pants back on. "That way he'll know that my boy knows how to take care of business."

"Your boy?" Peeta arched an eyebrow.

"Long story, don't worry about it." Now that Katniss was fully dressed again Peeta was walking towards the office door when Katniss remembered, "Hey, don't forget my 'Peeta penis.'"

Peeta looked back at Katniss and laughed, then walked over and picked up the socks, tossing them to her. Katniss began stuffing the socks back into her pants.

"You know Peeta, if you want to keep this reenactment reversal thing going when we go home tonight you can do the reverse cowgirl." Katniss smirked at him as he she joined him at the office door.

"I think for that to work you are going to have to put an awful lot of starch in those socks." Peeta gave her a quick kiss, and unlocked the door. They walked back out into the party where everyone seemed completely oblivious to the party of their own that they just had.

"Happy Halloween, Katniss."

"Happy Halloween, Peeta." She went up on her toes, kissed the corner of his mouth and they both walked hand in hand out of the office.