A/N: I don't own and of The Big Bang Theory characters and I am not making any money from writing this.

Please forgive any minor spelling or grammar mistakes, English is not my native language.

Bernadette took a deep breath, fixed her hair, and rubbed her hands together. She felt tension build up to her fist as she raised her hand, shivering as she knocked to the door, her chest heaving with the anticipation while she waited for Sheldon to open. Once he did, she couldn't help but blush a little, something tickling in her throat.

"Bernadette!", he exclaimed, obviously surprised. "What are you doing here?"

Bernadette shrugged, doing her best to appear natural, even a bit exhausted. "Howard is taking care of his mother while she is sick, it's his turn and I've finished the job early so, I've figured, maybe get here, have dinner and... get my mind in order before heading home", she concluded with a sigh.

A frown appeared on Sheldon's face.

"Is that OK?", Bernadette asked, feeling herself shiver as she studied Sheldon's reaction.

"I guess, but there is only a food for one", he answered, still a little confused.

"No problems, I have some leftover food from lunch from the cafeteria", Bernadette said, growing impatient. She sighed silently once Sheldon had moved to the side, allowing her to step into the living room. Sheldon closed the door behind, then sat on his usual spot on the couch, picking up his bowl of Thai food, and continued eating. Bernadette sat next to him, putting her purse to the side, pulled her sandwich out, and began eating. She was observing him carefully, thinking over every aspect in her head, thinking of the questions and tactics she had in mind and imagining his possible reactions. She swallowed hard, the constant thrill that she had been feeling overwhelming. How will it feel to finally have his tongue down her throat, his long fingers running down her chest...

After two minutes, she started. She decided to start with something that could actually interest him, but wasn't complex enough for him to get suspicious.

"Amy is very excited about your next date. You guys are interesting."

Sheldon gave her a coy smile. "Thank you."

"You are... close I mean."

"We sure are", Sheldon replied calmly.

"And regarding that... will you ever... you know..."

Sheldon frowned at her. "What?"

Bernadette blushed, lowering her voice. She wanted to look-and sound-non threatening, non intrusive. ""Do it.""

Sheldon frowned again. "What do you mean by that?"

"Have sex", she groaned.

"Oh", Sheldon exclaimed, staring widely at Bernadette, his lower lip quivering. Bernadette shrieked, afraid that she had scared him off. But Sheldon just shrugged and went back to eating. "It's a possibility."

"I know, but that doesn't say much", Bernadette said, trying to remain calm.

"Why do you want to know about that?", Sheldon snapped. "Why are you all so obsessed about sex?", he mumbled as he turned his attention back to the food.

Bernadette clenched her fists, trying to get her temper under control. "Because... Amy is my friend", she said, her voice surprisingly sweet. "She had been waiting a long time for you. And that would make her happy."

"I know that you don't have as high of an opinion about Biology comparing to your opinion about Physics, but you have to admit that both me and Amy are very intelligent women despite giving in, in one way or another, to our... urges."

Sheldon stared blankly in front of himself for quite some time, a frown appearing on his face. Bernadette was studying him carefully, her breathing even growing shallow, her meal temporarily ignored. "You actually have a point", he admitted, looking away for a moment, a surprise evident in his voice. But then he quickly shrugged and focused back on the take out. "But different things work for different people."

Bernadette took a little time to study him, carefully planning her next move. "Yes, but how will you know if you never try?", she asked, trying to sound casual and ignoring the shivers that instantly went through her body. Sheldon stopped eating once again and looked up, with eyes wide, even blushing a little. "And how long are you planning to wait?"

"Nobody is completely ready for... the first time", Bernadette said softly, hoping to sound helpful... no-ulterior-motivesly. "But the life is filled with risks, small and big ones."

"I guess that is the truth", Sheldon said in a low voice that had been colored with shades of confusion and shame, not looking up and playing with his food rather than eating it.

"So...", Bernadette asked, as lightly and cheerfully and tension free as she could, sounding interested, "I probably won't understand most of it, but how is your new research doing? I hear that it is important and that you had been working hard on it?", she added, instinctively licking her lips at the word "hard".

They ended up talking about it, and the conversation turned out to be strangely interesting and enjoyable. She already knew enoughg about physics to understand the basics and Sheldon wasn't too condescending while explaining her what she didn't know. Amy had really taught him a lot. And seeing him talk so passionately about his research was, Bernadette had to admit, kind of sexy.

After the conversation was over, she left, and he politely escorted her out of the apartment, almost seeming kind of sad to see her go. Bernadette smiled smugly as she started walking down the stairs. She couldn't wait to bring Amy up to speed. Maybe that would result in another one of their passionate nights, as an to the execution of their nefarious plan.

#

Bernadette and Amy's nefarious plan finally unfolded that Friday afternoon. Bernadette visited Sheldon again, and he let her inside, since she had made up a story about Howard leaving something there in the living room. After letting her inside, he sat back at the living room table and continued working something on his computer. She was moving around the living room, pretended to pick something up and put it in her pocket, and then headed toward the door. Sheldon barely even gazed at her.

And then she stopped and turned towards him.

Leonard and Howard were supposed to work late that day... Penny was taking a college class... Raj would rarely come over there at that time... and Amy was supposedly taking a day off and working on her research alone in her apartment, when she was actually waiting for the events to unfold on her laptop screen...

"Sheldon... I don't want to upset you, but... I've been thinking."

Sheldon looked up at her, appearing confused. "What have you been thinking about?"

Bernadette shrugged nervously before continuing. "You are going to have sex with Amy eventually. Maybe even quite soon."

Sheldon flinched for a moment, goose bumps appearing on the back of his neck, but managed to remain calm. "Maybe", he admitted, sounding strangely professional.

Bernadette started walking toward him slowly, carefully studying his reactions. "I know how well you took care of her while she was sick. How you stood up to Will Wheaton because of her. First times aren't very well, mostly... wouldn't you want to make it the best possible experience for her?"

He didn't answer, and she saw his Adam's apple bobbing up and down in his throat.

"Don't be scared", she said sheepishly. "I'm just asking."

"I... I would actually like that." He then shook his head and went back to sorting his notes, being back to his cold, calculated self. "But I'm sure that wouldn't be the problem. I know quite a lot about coitus already. And I know how to learn about things that interest me. And I have an eidetic memory."

Bernadette shuddered, deciding to make... a final move, so to say. She took a deep breath and continued walking over to Sheldon. "That is all nice and useful, but to actually..." She stopped right in front him, lowering her voice at the last word, studying every facial feature of his: he gazed at her for a moment and she noticed his Adam's apple bobbing up and down in his throat, but he soon went back to studying notes. That hadn't discouraged her. "Experience...", she moaned, gently running her fingertips down his left forearm. His body immediately stiffened, head sticking up but eyes once again managing to avoid the sight of her form: a crismon blush crept up his cheeks. "Such things...", she moaned, continuing the gentle movements of her hand. "Are different", she concluded with a hiss, grasping at his shoulder tightly, first juices leaking out of her at the contact. Sheldon shifted in his chair, even gasped, but didn't yell at her or move away. He was breathing heavily, still avoiding to look at her. Bernadette smirked and increased the pressure, feeling her chest heaving at the tension. She knew it.

Sheldon's head started moving towards his companion's direction slowly, his eyes aching to meet hers. She noticed a well constricted but not invisible bulge on the middle of his jeans and her clit twitched. She started leaning over towards him, slowly, taking a moment to take in his response in order to make sure that he wouldn't end it all: he bit his lower lip at the increasing closeness and his movements decreased, but he was still slowly moving to face her, his fingers trembling slightly. "I think you could use a little practice", she whispered, breathing out some relief at the end of that statement, every word filled with desire and sensuality that even made her shiver, her sigh sending chills down Sheldon's back.

"Now, after we kiss for a few seconds, I want you to slip yoir tongue in my mouth."

"O-Okay."

Their lips met, slowly rubbing against one another, making sighs and moans rise up from their throat. Finally, Bernadette felt Sheldon's tongue poking in: slowly at first, but soon enough it went all the way in. She let him linger there for a while, smirking as he let out a soft moan. She then nibbled at his tongue with the tip of her tongue. He shuddered, but pressed his lips harder against hers, making her feel hot. She aggressively wrapped her tongue around his, her lips crashing against his mouth.

Sheldon remained still for a moment, then pulled away, breathing heavily.

"It... it is too much for me", he complaints softly. "I don't know..."

"I'm sorry. I'll go slowly", Bernadette promised.

"I am not sure..."

"Nothing bad will happen to you."

Sheldon's demeanor grew rigid. "You enjoyed it, didn't you?"

He looked at her with his bright, wide opened green eyes, his cheeks blushing for a moment only to began returning to a normal color soon afterward. He stood up straight and took a step forward. She took one too. Eventually, they were pulled into a kiss again.

And then he slipped his tongue in again. And ran it down the underside of hers, making her nippples harden in delight. Their lips kept moving against each other's, hot breath invading the one's mouth. Once she wrapped her tongue against his, he groaned but didn't pull away.

"Uhm... You're a fast learner, Sheldon", she said, licking her lips. Her glare turned to the bulge that had been tenting his jeans. Sheldon shivered. "I see that it had... quite an effect on you, too."

"A natural physical response in a healthy young heterosexual man, I guess", Sheldon replied, trying to hide his insecurity.

"How about I take care of it?", Bernadette suggested and moved closer. Sheldon flinched, but didn't move away. She ran her fingers down his bulge. Every touch felt like fireworks for Sheldon: he sighed, his eyes closing shut for a moment: once he opened them, he found himself feeling flushed and saw Bernadette licking her fingertips.

"Bernadette...", he groaned.

"I know you want it", she purred, continuing to tease him.

"Okay", he growled. "Let's do this." He made it sound like an order, which made Bernadette revel in a sudden bliss.

Bernadette walked over to her purse, opened it, pulled out a piece of protective plastic and carefully plastered it over Sheldon's spot on the couch. She then turned to face him, meeting his surprised gaze. Before doing so, she had made a few suggestive clicks on his laptop, and he was too distracted too notice. The Skype programme was activated, the invitation being sent to Amy. She quickly minimized her window, so she could see them but was herself barely noticeable.

"You had been carrying this with you?", Sheldon asked upon seeing what she had been carrying.

Bernadette almost jumped in place, fearing that he would realize the whole thing had been planned and call it off. She tried thinking of an explanation, but couldn't. Eventually, she just said: "I'm a microbiologist."

He stared at her for a few moments, then just said, almost matter of factly: "Oh."

Bernadette sighed silently in a relief, then smiled at him. "Sit down."

"I think we should go to my room..."

Bernadette's face turned dark. "Sit. Down." Sheldon stiffed. "It will be more exciting that way", she then said, in her usual cute voice.

Within a minute, Amy, wearing nothing but a bathrobe the whole day, found the invitation and answered, immediately being connected with Skype. She sat on the chair in front of her writing desk and watched the scene unfold on her screen, squealing upon realizing that the whole things had really been happening. She started playing with herself, the mere sight of Sheldon and Bernadette about to go at it making her aching pussy cream.

Sheldon sat down on the spot. Bernadette went to the bathroom and came back with a bottle of mouth wash. She gave it to Sheldon, as well as a plastic cup that she had pulled out of her purse. She then pulled her own bottle of mouth wash from her purse. They both used it to clean their mouth, then spit it in the cup. Bernadette put her bottle back in her purse, then took Sheldon's mouth wash and both cups and went back to the bathroom. She returned soon after, empty handed.

"Do you have a Purell?", she asked.

Sheldon pulled the bottle out of his pocket and handed it to Bernadette, who applied it to her hands. Then she handled it back to Sheldon, who also applied it to his hands, then put it back in his pocket. She then took her blouse off, slowly, allowing Sheldon to see her exposed torso, inch by inch, before finally giving him the full view. She threw it on the floor near by. Sheldon shivered, feeling himself harden even more at the sight of Bernadette's breasts filling the black lace bra. Amy moaned, the memories of the last weeks night coming back to her. She started rubbing herself harder-she had Gerard near by, just in case. Bernadette walked over to Sheldon and sat on his lap, her front side turned towards him, his hard on stiffing up between her legs.

Sheldon put his hands on her breasts, moaning at the newly found feeling, jolts grazing from his fingertips down to his stomach. He started running his fingers up and down the smooth flesh, exploring Bernadette's curves, every touch sending warmth go down her pussy. When he placed a gentle kiss on her right breast, Bernadette shivered, feeling her G-spot erect as a drop of warm wetness rolled down her thigh: Sheldon felt a pressure in his crotch area increase, her soft skin lingering against his lips.

He groaned, feeling her hard nipples press against his hands as his fingers dug into warm, tender flesh. Bernadette moaned, feeling her panties drip with wetness. He began fondling her breats, every touch increasing his arousal. Amy continued running her pussy, sighing as she trailed a move up her aching pussy, the sight on the screen giving her goose bumps: she licked her lips, remembering Bernadette's taste.

Bernadette then got down on her knees and unzipped Sheldon's jeans. He sighed, part due to the situation, part due to finally getting some relief on his swollen erection. Bernadette slowly slid Sheldon's jeans down to his ankles, feeling herself grow wet at the sight of his erection poking at his briefs. She slid them down too, her folds swelling at the sight of Sheldons eight inch long hard cock in front of her. Amy gasped and slid a finger up her vagina, hearing her wetness. She started fingering herself hard, eyes focused on the screen, her pussy dripping with arousal, excitement so intense that she felt her heart thunder against her chest.

Sheldon moaned as Bernadette's mouth wrapped around him, his eyes closing for a moment and his hips bucking up due to a friction. The feeling, her warm breath, the wet heat, it was overwhelming, nothing like any other sexual simulation he had experienced before. Amy suppressed a moan and started circling around her enlarged clit, studying her boyfriend's reaction with delight. Oh, he was definitely ready. She couldn't wait to get to do that same thing to him. She even envied Bernadette a little, but the scene in front of her was a pure delight. Bernadette started circling with her tongue around Sheldon's shaft, exploring every inch of it, savoring every feel and every taste, the mere feeling of that big thick cock in her mouth making her cream her panties as she whimpered against his flesh. Amy was staring at Bernadette's pretty blonde head bobbing up and down Sheldon's legs in amazement, now rubbing at herself with the rest of her hand while fingering herself in the same time, every touch sending jolts go through her muscles, a shiver running down her back.

"Oh, Bernadette... yes...", Sheldon was moaning. The sound of that filled both Bernadette and Amy with a thrill. The blonde increased the frequency of her tongue movements, licking at Sheldon's pre cum greedily, tightening her soft warm lips around his erection, while Amy couldn't help but moan as she slipped another finger inside her wet hole, muscles immediately tightening around it while her G-spot hardened. She added another finger while continuing to take in the erotic act that had been unfolding in front of her, juices running down her thighs as she managed to spot traces of pre cum around Bernadette's busy mouth.

And, with warm shivers writhing inside of him and pleasure ripping through his muscles, Sheldon came, crying out Bernadette's name as he shoot his cum into her mouth. Bernadette swallowed every drop, the tender, bittersweet taste combined with the sight of Sheldon's form archive due to an orgasm making her pussy throb. Amy was staring at the screen with eyes wide, pushing her fingers as far as possible and using her thumb to rub her clit in the same time, her mind taking in every detail of an obscene act unfolding on the screen and coming up with the dirtiest possible image in the same time: her whole body was arching and writhing when she came, eyes glued to Sheldon and Bernadette as jolts ripped through her flush, her cum shooting from between her fingers all over the room and her fingers continuing with the simulation until the last bits of the ecstasy had evaporated from her.

Bernadette then pulled out, licking her lips as she looked at Sheldon. He picked up wet wipes.

"Did you like it?"

"Yes. It was... incredible."

"It is good to know what you want right away. You should have Amy do that to you. That will help you with premature ejaculation."

"I will."

The interaction made Amy's clit harden again, her whole body warming up, not only because of the anticipation of what was about to happen, but because Sheldon's statement implied that he will have sex with her soon. She was staring at the screen, impatiently waiting for more dirty parts.

As soon as he finished cleaning himself up, Bernadette grabbed his semi erected cock, making him moan as his dick grew hard in her hand. Her eyes met his, her voice lowering to a naughty hiss. "I think now is the time to go to your room."

Sheldon said and did nothing for the first few seconds, possibly having second thoughts about the suggestion. Eventually, he stood up and ran for his room, only stopping to pull his jeans up to make it for a more easier walk, followed by Bernadette.

While they were walking towards the room, Bernadette pulled out her phone and sent a Skype invitation to Amy, who immediately responded. Sheldon was too horny to notice. Homo Novus my ass!

Bernadette managed to rush towards the bed before Sheldon, and she set her phone on a near by counter, just behind the lamp but with enough space for Amy to get the full image. She was sure that Sheldon wouldn't notice if he wouldn't look there hard enough, and he had the more important things to look at.

Sheldon closed and locked the door behind, then rushed towards the bed. He was holding a bottle of Purrell in his hands and quickly applied it to his hands again, then handed it to Bernadette who did the same. She put the bottle on the counter and then Sheldon leaned over and kissed her passionately, his whole body arching forward as he felt her warm lips against hers again, his tongue moving inside to taste her mouth some more. She put her hands on his arms, feeling of his biceps pulls at their actions making her wet. Amy was biting her lower lip furiously, gripping at the smartphone so hard that it almost hurt. She laid down on the bed, holding her smartphone in front of her face, spreading her legs as she positioned herself naked on the top of the mattress-it was making her feel more free, more dirty.

Bernadette moved her lips sweat from Sheldon's, making him moan, and pulled his T-shirt off, fondling it neatly and putting it on the bed near by, just the way she knew he would like, before their lips met again, their tongues dipping and exploring as the obscene noises they had been making filled the lanky physicist's room. He was the one to pull away the second time, pinning her down on the bed before he started unbuckling her bra. Bernadette cried, her senses overwhelming by pure pleasure. Amy gasped at the sight and took a moment for it to sear into her mind before she picked up Gerard, turned it on and pushed it up her pussy, her senses going wild as her eyes remained focused on the coitus about to happen.

"Take me, Sheldon", Bernadette was moaning, her pussy wet and achy and her breasts flushed. "I'm all yours. Don't worry, I am on a pull." She licked her lips as her eyes met Sheldon's lust clouded ones. "Fuck me", she purred, pouting her lips. He flinched. "Hard. I want to feel everything, and I want you to feel everything too", she said as she pulled her panties down slowly, revealing her cum creamed hole. Sheldon swallowed hard despite the lump in his throat and positioned himself to be between Bernadette's legs, albeit still kind of reluctant. Bernadette grooped his firm ass and licked his erected left nipple, her inner body burning with desire.

Then Sheldon pushed in, crying out Bernadette's name upon feeling the slick wetness press against his shaft. The sound sent shivers down Bernadette's core, her walls swelling at the penetration while her clit hardened. Amy pushed Gerard in harder, the sight so erotic that she felt her whole body writh, her limbs feeling like frozen. There was still some concern bothering Sheldon, but he did his best to push it to the back of his mind and kept thrusting in and out of Bernadette; it felt so good, every move was making his senses go wild. Bernadette could only gasp, the new sensation combined with all the passion and energy overwhelming: the feeling of Sheldon's cock penetrating her. Every next scene, thrust, moan would only arouse Amy even more, her juices kept running down her thighs and ass. She felt her muscles tighten around the toothbrush, a writh going up her chest...

And, with his hands grooping on Bernadette's breasts and his cock deep inside her pussy, Sheldon came. Amy watched, both of them revel in pleasure, naked, Sheldon's tall, well built body on the top of Bernadette's busty form: she cried out Sheldon's name as she came too, her juices making a wet stain on the clean white bed sheet.

Sheldon lied on his back on the bed next to Bernadette, both of them breathing heavily as the smell of sex and sweat filled the room. Amy turned the Skype option off, put the smartphone in her desk drawer and went to take a long warm shower, her walk still a bit weak and her back sore as she was thinking back about the recent events that had happened in Sheldon's room. And what was planned to happen in the master's bedroom in Howard and Bernadette's home soon.

"What have we done?", Sheldon exclaimed more than asked, staring blankly at the ceiling. Bernadette turned to lie at her side, her energy partially regained. "Something great", she whispered sexily and then trailed a lick up his collarbone, feeling him shiver against his tongue.

Sheldon was upset, but luckily didn't yell at her or run away. "It doesn't feel completely... right", he shined, making Bernadette roll her eyes. "I think that Howard would get hurt if he were to find out." He looked down at the sheets in shame. "I don't want to hurt my friend."

"He won't find out, I promise you." "And even if he does, which he won't, it won't hurt him."

"How so?"

"Our marriage is... what some people would call it.. modern."

"Surprisingly, I am not familiar with that term."

"Oh."

"Of course, you won't tell him, and I won't either. We still don't want any awkward situations in our social group, don't we?"

"I know that I don't."

"Me neither."

"But I am not good at keeping secrets", Sheldon whimpered.

Bernadette sighed. "Relax. Nobody will ask you about this."

Suddenly, a night smile appeared on Bernadette's face. She leaned over to Sheldon, pressing against his torso, her hand on his chest, making Sheldon look up at him. "I've just realized something", she whispered.

Sheldon laid her hand on Bernadette's thigh, feeling himself stir. "What?", he asked.

She leaned in closer, her hot breath tickling at his face, her voice turning dark. "We have the whole afternoon just four ourselves", she whispered before pressing a passionate kiss on his mouth, gasping as Sheldon slipped his tongue from between her lips and pulled her to lay on top of him, his hands moving down to her ass and his erection pressing against her pelvis.