Naughty, naughty, Sheldon!

:Invisible:

Sheldon had never felt more free. He laughed and did a little hop. He had not only created an invisibility ray, but he had successfully used it on himself, three times. Once to make sure it worked, once to make sure it was reversible, and again to be invisible. He looked in the mirror above the sink in the men's room again and saw absolutely nothing. Oh what fun he was going to have with this!

Leslie looked up with a frown. The lab door had popped open. She rose from her stool and went to close it. When she turned around her banana began sliding across the table slowly. Her eyes went wide as it reached the edge and suddenly stood on end. Everything on the desk across from the table suddenly flew off and hit the floor. Papers flew through the air. A deep voice suddenly screamed "WITCH" and she bolted, screeching down the hall.

Barry was using a urinal when the lights in the bathroom suddenly went off. "Fweakin' powah owtage!" he cursed. He finished urinating and zipped his pants. He stumbled over to the sink to wash his hands and the lights came back on. Barry jumped and landed on his butt in a puddle of water. The mirror was covered in marker. Someone had drawn a crude troll face in it, so that when he looked up, his face was superimposed in it. Barry shivered with fright. He had heard Winkle's story and laughed at the idea of a ghost. Was it true?

Stories spread quickly. The art students ran from class after paint mysteriously flew threw the air and drenched them. The cooks in the cafeteria reported burgers that yelled at them about hairnets. During Leonard's lecture there was an eerie whistle that kept repeating the tune from Close Encounters.

By the time 5 o'clock rolled around everyone was on edge. Sheldon sat beside Leonard in the front seat and feigned indifference to the stories.

"Leonard, there is no such thing as ghosts, spooks or specters. There is a rational excuse for all these things."

"Oh?" Leonard asked with annoyance. "Then what is it? What's the rational excuse?"

Sheldon shrugged. "How should I know? I have not examined any of the occurrences."

Leonard rolled his eyes. "Fine. You examine them and then let me know." Sheldon suppressed his smirk and looked out the window.

It was Anything Can Happen Thursday and the guys were out trying to pick up women. Sheldon used the ray again and slipped out of his apartment. It was torture to only knock once on Penny's door. After a moment she opened it and frowned when she saw no one. Then she closed the door. He waited 10 seconds and knocked once more. This time she took a couple of steps into the hall to look down the stairs. Sheldon eased into her apartment and waited.

Penny walked back in and locked the door. She frowned and moved back to the kitchen where she drank the last of the wine in her glass and then walked to the bedroom. Sheldon followed, waiting for the perfect time to scare her. He wanted to catch her completely off guard. Penny flopped down on the bed and stuck her ear buds in. Sheldon huffed. How could he scare her if she couldn't hear him?

He was trying to devise a new plan when a low moan made him turn back to her. Sheldon gawked as Penny caressed her breast. When had she removed her shirt? He was unable to move or even look away as her hands slid down to her tiny shorts. She hooked her thumbs in them and then slid them off. Her black thong left little to the imagination. Sheldon swallowed the lump in his throat and sprang into action. He rushed over and grabbed her wrists. Penny shrieked loudly as she struggled against restraints she could feel but not see. She kicked out wildly and heard a grunt near her ear as her foot connected with something hard.

"Penny! It's me! It's Sheldon!"

"Sheldon?" She froze and looked around wildly. The bed dipped beside her and the invisible hands loosened around her wrists.

"Yes, you can't see me, but I'm here," he said gently.

Penny shivered. "Why can't I see you?" She heard a soft sigh and turned in that direction.

"I'm invisible." His voice was regretful. "I was, umm, going to scare you, but then you …and I was …I had to stop you. Before you…"

Penny blushed and closed her eyes tight for a moment. "Holy crap on a cracker!"

Suddenly they were both reminded of her very near nudity. Sheldon started to raise up off the bed when his excellent hearing noticed the sounds coming from her dislodged ear buds. Penny watched in fear as one bud rose in the air.

"Penny?" Sheldon's voice was uncertain. "This is my lecture from last year's physics symposium." She bit her lower lip and nodded slowly.

"Why are you listening to it while you…" Sheldon's pulse skipped a beat as he realized what was going on. Penny cringed with embarrassment. She began to move off the bed but a hand released her wrist and settled on her hip gently. Warm breath tickled her cheek as Sheldon whispered to her.

"Are you getting off to my voice, Penny?" The hand moved up to her ribs and back down in teasing strokes. Penny moaned slightly and nodded. Sheldon was overcome by a rush of power. He grinned and traced a finger along the top of her thong.

"You don't want an old lecture though, do you?" he asked with a drawl. Penny gasped and her eyes became unfocused. Sheldon dipped his head until he was almost touching her ear. "Wouldn't you rather have me talk you through it?

Penny moaned louder. "Please, Sheldon!"

He blew gently in her ear and smirked. "Please what?"

Penny sobbed with desire. "Talk science-y to me, touch me, everything, just don't stop!"

Sheldon slid her thong aside and stroked her as he explained quantum mechanics.

Sheldon looked up from his desk as Penny entered the apartment and said hi to Leonard. Sheldon hadn't seen her in two days. He was sure he had damaged their relationship on Thursday, but was at a loss on how to fix it. He was surprised when Penny walked up and peered over his shoulder at the screen of his laptop.

Her breath tickled as she whispered. "It's laundry night. Bring your ray gun and we'll play Mister Fantastic and Invisible Girl."

Sheldon's eyes went wide and he looked at Penny in shock. She winked and he grinned wickedly. He had been right. Oh what fun he was going to have.