Written By Shama

Passing Grade

John's Office

"I am never going to pass this stupid test!" Natalie cried out in frustration, throwing her notebook on the floor of John's office.

John looked up from his case file and grinned. She was so cute when she was agitated, her face flushed with heat, her ocean blue eyes blazing. His eyes wandered to her ample breasts, encased in a tight, white t-shirt, her pale pink bra slightly visible. Although he loved every inch of Natalie's voluptuous body, her breasts made his heart stop beating. They fit perfectly in his hands when he fondled, massaged and squeezed them. Her pink nipples puckered at his slightest touch and were very sensitive to cold air.

"John! Did you hear me?" Natalie called out.

John shook his head clear of his smutty thoughts and focused on Natalie and her piercing glare.

"Sorry. What were you saying?" John asked as he shifted in his seat, trying to stop his hard on.

"I said that if I failed that damn practice test then there is no way I am going to pass the real one." Natalie threw her head back onto John's couch, her silky red hair falling on her slender shoulders.

"I should give up now and save myself the embarrassment."

John got up from his chair and walked around his desk. He sat down on the chair across from Natalie and took her delicate hands into his.

"You are not going to fail Natalie. You are going to pass and I am going to help you."

Before Natalie could say anything John got up and closed the doors to his office. Natalie watched with a joyful smile as John picked up his phone and told his assistant not to let anyone disturb him.

John turned back to see Natalie smiling at him happily. He picked up the notebook she had thrown, handed to her, and sat back down.

"Okay," he said, picking up one of her heavy textbooks, "I'll ask you some question from chapter 5."

"Oh great," Natalie replied sarcastically. "I hate chapter 5! It's all about mass spectrometry. "

John gave her one of his sexy grins. He knew she had been studying this chapter the most because of all the footnotes she had written on the pages. John noticed her less than enthused attitude and realized he would need to make the material more interesting in order for her to focus. He had a flash of brilliance and smiled.

"Maybe," he began to say in a slow, sly way, "we could make studying a little bit more interesting."

Natalie gave him a doubtful smile. "Mass spectrometry interesting? Next you'll be telling me that studying blood splatter patterns is more fun then shooting pool."

"Just here me out okay. I was thinking that if you answer a question right," John began to say in a slow, teasing manner, "I will take off one item of clothing."

Natalie's eyes widened, a smile slowly spreading across her face. "Are you serious? You'll strip for me?" She asked him in a sexy whisper.

John gave her a salacious smile. "I'll take off one thing for every question you answer right," he repeated. "But if you answer a question wrong then you have to take something off."

"Wait a second!" Natalie protested. "That's not fair. One, I hate everything about mass spectrometry so I will end up sitting on your couch naked and feeling more like an idiot then I did before and two, you have an advantage over me."

"What advantage?" John asked her in amusement.

"You have more clothes on then I do! You have your suit jacket on, your black shirt, your boxers, your pants, socks, and shoes. I'm wearing a t-shirt, my bra, my jeans , and my high heels."

"And panties," John added.

Natalie smiled at him sheepishly. "Actually," she said coyly, "I'm not wearing any panties."

John felt a familiar stirring in his pants. The knowledge that Natalie was going commando made him want to sweep everything off his desk, throw her down it, and savage her body passionately.

Natalie giggled at John's obvious discomfort. "Are you alright John?" she asked in a sultry voice.

John cleared his throat, looked down at the text book and nodded hid head rapidly. "Yeah, yeah I'm...okay. So what do you think?"

"Well, if you take off your jacket, both of your shoes and one sock to even things out then I'm in," Natalie answered pensively.

John pulled off both shoes and his right sock. He removed his jacket and threw on his desk.

"Okay," he said with a sexy smile. "First question is easy. What does a mass spectrometer do?"

Natalie's eyes were shut tight as she answered. "A mass spectrometer measures the mass to change ratio of ions."

"Excellent," John replied.

Natalie's eyes popped open with surprise, "Really? I got it right?"

"You got it right," John said, smiling at how happy she was. "Okay, one right answer means I take off my left sock."

Natalie had a smile like a Cheshire cat as John threw his left sock on to the ground.

"Okay Buchanan, question two. What are the two laws that apply to the mass to change ratio?"

"Lorentz force law and Newton's second law of motion," Natalie replied automatically.

"Right again," John told her. He stood up and began to unbutton his blue shirt slowly, feeling the heat of Natalie's gaze.

"That's it baby! Work it!" Natalie exclaimed playfully, loving every minute of John's uncomfortableness.

"I thought you said you didn't know this stuff," John said as he sat back down.

"I never said I didn't know anything about mass spectrometry. I said I hated it," she replied with a sly grin.

"Oh so that's how it's going to be? Well then here is a harder question. Which analyzer oscillates electrical fields to selectively stabilize ions passing through a radio frequency?"

"Time of flight analyzer," Natalie replied knowingly.

"Oh I'm sorry but that's wrong. The correct answer is quadrupole analyzer," John told her with a sexy smirk.

"You are so lying," Natalie cried out indignantly. She grabbed the textbook out of John's hand and looked for herself.

John leaned back in chair and grinned as her face flushed with anger. She looked up at him, her eyes blazing with heat. She tossed the book back at him and said, "It was a stupid question."

"It may have been a stupid question but you got it wrong. Come on Buchanan, take something off," John replied playfully.

Natalie scowled at him as she took of her right high- heeled shoe. "Pervert," she said as she threw her shoe on the floor.

10 minutes later and John was clad only in his black boxers. Natalie was one question away from him being totally nude. Natalie sat across from him, her arms crossed over her pink bra. Her white shirt laid in a puddle next to John's pants. She just had to answer one more question right and then her eyes would be a able to feast upon John's sexy body. She looked down at John's crotch and could see his thick, long cock hardening.

"Ah ha! I got it," John said triumphantly. He gave her a cocky smile, knowing she would never be able to get the question right. In mere seconds John would be treated to either her amazing tits or sexy pussy!

"Okay Detective, let me have it," Natalie replied in a sultry voice.

John could feel beads of sweat form upon his brow. He was rock hard and he desperately wanted to throw the text book down and fuck Natalie hard. He cleared his throat and asked, "How does Fourier transform mass spectrometry measure mass?"

Natalie bit her lip from smiling. She knew the answer but at that moment she was so horny she could have cared less. She gave John a puzzled look and shook her head slowly, her bottom lip pouting slightly.

"I don't know," she said innocently. "I guess that means I have to take something off."

John's eyes widened as Natalie stood up slowly and walked towards him, her hips swaying with each step. She stood in front of him as her hands made their way to her breasts. John licked his lips and watched in awe as Natalie squeezed her tits, pushing them together and jiggling them for him. She pinched her nipples through the thin fabric of her bra and moaned with pleasure as she felt them harden.

"Do you want me to take this off or..." her voice trailed as her hands glided down her lithe waist before resting on her jeans. "Or do you want me to take this off?"

John opened his mouth to speak but no words came out. He threw the textbook on to the ground and wrapped his arms around Natalie's hips. He pulled her closer and started to kiss and lick her stomach. His hands squeezed her ass as Natalie ran her fingers through his hair.

The moment Natalie felt his lips on her body her pussy began to get wet. She needed him now!

John felt her move away from him. She stepped back and gave him a sexy smile. She slowly unbuttoned her jeans and lowered the zipper. John reached into his boxers and pulled his cock out, stroking it gently as Natalie's jeans fell to the floor.

Natalie stepped out of jeans and kicked them to the side. Her right hand moved in between her thighs and John let out a guttural moan as she ran her fingers up and down her wet slit. She pushed a finger in and finger fucked herself. She pulled out slowly and walked over to John. She held out her finger to him and John greedily sucked it clean.

Natalie got on her knees and removed John's hand from his dick, pre-cum oozing from the tip. Natalie leaned forward and licked his sweet essence. Her tongue swept across the throbbing head as her right hand stroked the base. Her left found her clit and she massaged it gently.

John placed his hands in her hair and pushed her head down, silently begging her to suck his cock. Natalie looked up and gave him a devilish smile before engulfing his entire length. John threw his head back and pushed his hips up as Natalie started to deep throat him. He could feel the head of his shaft hit the back of her throat. He looked down and saw Natalie's head bobbing up and down, pressing her nose against his abs.

Natalie could feels John's cock pulsating in her mouth. She slowly released him with a pop, continuing to stroke him. Her left hand reached behind her back and she unclasped her bra. She let go of John's dick, which was standing proud and firm, and slid the straps of her bra down her arms. She stood up quickly and straddled John's lap.

John pushed his boxers down his leg and held onto his cock as Natalie slowly lowered herself. They moaned in mutual pleasure as John ran the head of his cock up and down her slit, coating the head with her juices. Natalie placed her hands on John's strong shoulders as John's dick pushed into her pussy.

"Oh God!" She cried out as she pushed herself all the way down. John's cock was stretching her pussy out and Natalie could hardly breath. She began to rock back and forth, pulling him in deeper.

John's hands gripped Natalie's hips as she slowly rode him. He looked down and watched in fascination as his shaft slid in and out of her. He could feel her walls clenching him as she humped him with increasing speed. Her tits bounced up and down and John could help but latch on to her nipple, sucking and biting on it gently.

Natalie fucked John hard. She slammed down on him with each thrust, his throbbing cock pressing against her g-spot.

"John!" she screamed out in bliss as his left hand found her clit, rubbing and pinching it gently.

"Faster Natalie!" John demanded forcefully. He continued to rub her clit as she bounced up and down his cock.

Natalie's body went rigid as she felt her orgasm approaching. She wanted to cum with John so she reached her left hand back, in between John's legs, and started to massage his cum filled balls.

"Oh fuck!" John yelled out as Natalie squeezed his balls. His cock began to pulsate and he knew he was about to erupt inside of her. He pushed his hips up and thrust into her a few more times before her walls milked him.

Natalie's head fell onto John's shoulder as her pussy leaked onto his cock, his cum shooting into her womb. They were both breathing heavily, their bodies slick with sweat. After what seemed like hours Natalie lifted her head and kissed John deeply. She pulled back, gave him a satiated smile, and said:

"You are the best teacher I have ever had!"