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When Penny walked into the boys apartment that night, she knew it wasn't over. She pursed her lips and narrowed her eyes at him. He was standing at his whiteboard, wearing only one shirt, with the sleeves rolled up and a hand in one pocket, he other lazily writing something unreadable on the board.

Two friends and one close acquaintance were in the living room watching him warily.

"Hey guys." Penny smiled. "Whats up?"

"Ah, Penny!" Sheldon turned and looked at her with a smirk of a smile. "There you are, I find I need your help with an experiment."

She raised her eyebrows. "Okay?"

He put his hands together behind his back and rocked forward onto his toes slightly. "It might be dangerous, with horrible consequences should it go wrong, or worse, we get caught."

"Caught doing what?" She asked suddenly as wary as the other occupants of the room.

"The experiment." He said simply.

She looked at him. He looked normal, except for the one shirt thing, and the little hickey right on the bottom of his neck, and the look in his eyes which he usually only wore when issuing a challenge. She looked at the others in the room.

Leonard looked resigned, like it had become inevitable that Sheldon would rule the world someday soon. Howard looked slightly amazed, and slightly terrified, she noted his eyes appeared to be locked on the hickey, and the understood that one. Raj was twitching his eyes back forth between them with a look on his face like he really, really wanted to know what was going on, but that he'd forgotten to re-stock his survival bag and was suddenly regretted it.

"Does it involve the end of the world?" She asked.

Sheldon inclined his head slightly. "A valid question. Not the end of the planet certainly, though possibly the end of the world as we know it."

"Will it win a Nobel Prize?"

"No." Sheldon almost smiled. If only winning Nobel's were so easy.

"Are you going to tell me what it is?"

"Just that should you agree, you will be required to accompany me to work tomorrow." He raised his eyebrows.

She nodded. Well, that would take one thing off her list. "Okay sure." She shrugged. "Why not?"

"Why not!" Howard squeaked. "He could be asking you to help him prove a radio active experiment!"

"Well, I guess if it goes wrong, we'll both be super heroes then." She replied, taking her usual seat and reaching for some food.

"Villains." Sheldon corrected. "Heroes don't bite."

She shot him a look. "Heroes peek though."

"Mwah ha ha."

Raj ran for the bathroom.

The next morning, Sheldon dressed carefully.

The black pants from the suit Penny had picked out for him. An orange shirt, with his red flash t-shirt on top. He'd read a new study which proved that women were attracted to men wearing red. It was an Alpha colour.

Take that Superman, he snickered to himself.

He had thought of wearing a tie, but didn't want to attract too much attention to his change of casual attire, it might bring upon them even more attention than just Penny beside him would.

He wouldn't be surprised if Gablehouser himself dropped in. His casual remarks about experiments tending to go horribly wrong had probably been enough for Koothrapali and Wolowitz to give him a wide berth though, and Leonard certainly wouldn't intervene, he'd just gotten a new lab assistant who had already mis-aimed a laser and blew a hole through the door.

He smiled. He was going to win.

Casually, he walked Penny through the building, he was glad to see that she had worn a skirt, trying to look professional probably, he didn't know, it didn't really matter, though it would make it slightly easier for him once she caved. He pointed out people, introduced her to those she hadn't met, and guided her towards his office. He had spent the rest of the previous afternoon prepping. The whiteboards were all covered in writing, except one.

He ushered her in, a smirk on his lips as he shut the door with a bang.

"So." She licked her lips. "Whats the big experiment?"

"It's already begun." He gestured to the other boards. "Now, if you could grab that pen," he pointed to one on his desk, and start writing out that formula on that board there, I will prepare the rest."

Penny nodded and did as he asked. She wanted to ask questions, but she felt strange, he was so obviously a figure in charge here, students had run from him and flushed when he congratulated them on not failing his latest test, and his fellow doctors had all acknowledged him, though some with puzzled glances at her, and others with a wary glance that showed they had been bested by his mind before and no desire to match wits with him again. The only ones dumb enough to do that appeared to be the Leslie girl that Leonard and Howard had dated, and the one with the speech impediment.

This must be really important stuff. He was a big shot in the world of physics, and she'd had him calling her name just the other night, touching what he wasn't supposed to touch.

She was so glad he'd caved.

She was certain that this would be some kind of attack though.

He pressed his mouth to her ear suddenly and she gave a jump. "Don't stop writing." He said clearly.

|"Okay?" Her eyes widened, and she forced her pen to keep moving. His hands were on her hips, but sliding up over her stomach, cupping her breasts and copping a feel. She paused and shut her eyes, and he quickly stepped away from her.

"Don't stop writing."

Oh dear god. This was his workplace. He was going to make her.. No.

She kept writing. His hands were back.

On her hips.

Under her skirt.

Trailing against her skin as he pressed against her, and let his lips travel down the back of her neck.

She kept writing, though she couldn't read what she was writing anymore, and she knew without a doubt that her cheeks were probably pure red.

There was a knock at the door, and Sheldon quickly sat down at his desk before calling for the person to enter.

"Dr. Cooper." The man said, giving Penny an appraising glance before turning raised eyebrows on Sheldon who appeared to be calmly doing calculations at his desk.

"Dr. Gablehouser." Sheldon replied. "What do you want?"

"I heard you had an attractive assistant today, I wanted to see for myself."

"Of course." Sheldon sighed. "Penny, this is Dr. Gablehouser, Dr. Gablehouser, this is my, " he paused. "Girlfriend, Penny."

Penny smiled. Mission successful!

"Don't stop writing Penny." Sheldon reminded her, his voice flat, with a slight twang. She swallowed and continued copying out the horrendously long equation on the paper. She wasn't even sure it was all going to fit on the board, and the board was the size of her car windshield. She knew this was turning him on, it had to be, being able to touch her, while she couldn't touch him, the twang had suggested he was hiding a huge biological response behind his desk, or rather under it, and suddenly she wished that's where she was too.

She glanced at his desk quickly and noticed it wasn't the kind that went all the way to the floor, damn.

She kept writing.

As soon as Gablehouser was gone, Sheldon was back behind her, his fingers running over her body, then into it.

"Penny, what was that name you called me when you caught me by surprise on my desk chair?"

"Doctor." She whispered, leaning back into him, barely able to grasp the pen and hold it to the board. His fingers kept bringing her close, and the pulling away. He was driving her nuts.

She could feel him, pressing up against her, even as he whispered again, to not stop writing. His fingers worked her, and she thought she heard a rumble from his throat, and suddenly, she had had enough.

She turned around, pushed him up against his desk, till he was sitting on it, and then she climbed on top of him and within seconds had him deep inside her.

"Ohmygod." She whispered. "Sheldon, I'm... On your desk." She kept moving though.

"I know." He whispered. "If we get caught..."

She groaned and moved faster, harder, there was no way she could stop now. "Will you loose your job?"

He snorted. "Hardly. I'll probably get a phone call home to my mother though, Gablehouser has her number I believe."

Penny groaned against his throat, not stopping. "Your mom will freak."

Suddenly, he flipped her over, and was moving on top of her. "I know." he whispered. "She might make you marry me."

She didn't appear to mind, but then she was making that noise again. Just to make sure he won, he had her again, up against the door.