Ever known someone too smart for their own good? Penny has.

:Museum:

"The moment I get room to maneuver, you're a dead man Cooper!" Behind her she could feel Sheldon quiver as he tried to draw away. Unfortunately that just wasn't an option.

"Ouch!"

"Sorry!"

"Stop moving!"

"I can't breath!"

"Good!"

"Sarcasm?"

"You wish."

Sheldon sighed against her neck and Penny felt some regret. "I'm sorry sweetie. I'm just scared."

Sheldon leaned his forehead against the back of hers. "I truly regret getting us into this predicament."

Penny tilted her head to the side and leaned back on his shoulder. She could barely see his face in the gloom. "It's as much my fault as it is yours. I asked you to read the inscription. How were you to know it would do this?"

Sheldon shrugged and covertly tried to shift his pelvis further back. "I should have looked the inscription over before reading it aloud."

They were silent for a few minutes. They could still hear the shuffling and moaning outside the sarcophagus. "Sheldon? Do you think the others are okay?"

He thought about lying to her. She couldn't see his ticks. But he had always strove for honesty with Penny after the "Cousin Leo" debacle. "I do not know, Penny. I hope so, but the odds are not great."

She sniffled and leaned back against him, seeking warmth and comfort. She had no idea how long they had been trapped here. Coming here was supposed to be her birthday present. There was a month long exhibit of Egyptian artifacts at the Natural History Museum in L.A. and it had seemed like the perfect way for everyone to spend a Sunday. She loved the butterfly gardens and was really looking forward to seeing the Egyptian exhibit. Then she had asked Sheldon what an inscription on a tablet said. The moment he finished reading a cold gust of wind had burst through the room. The four mummies on display had awoken and attacked. Sheldon had quickly jumped a rope and pulled her into the now empty sarcophagus. Before it closed on them, she had seen Bernadette and Raj racing for the door. She hadn't seen what had happened to Leonard, Howard or Priya.

At some point they must have dozed off because Penny woke up to find Sheldon's arms wrapped around her tight. Her hands were over his, as if holding him close. She was wondering if she should wake him when he began to shift. The sarcophagus had been set on a specially made display stand that allowed it to be tilted back at a slight angle. Sheldon was behind her, and each shift he made caused his pelvis to brush across her bottom.

Penny's eyes went wide as she felt him become aroused. Holy frak, Sheldon was getting a hard on, and by the feel, his legs weren't the only thing long about him. She shouldn't. She couldn't. But she did. She wiggled back against him and pressed firmly. Sheldon sighed and bumped his hips forward. Penny moaned low in her throat and suddenly he was awake. And embarrassed.

"Penny?" he breathed softly. "I… I don't know what to say."

She nibbled on her lip for a moment, trying to decide what to say or do to put them both at ease. Finally, her big ol' 5 status kicked in. She began to grind against him gently. She heard him gasp at the sensation and slowly his hands slid from her stomach to her hips. She expected him to grip her hips and make her stop. Instead he pressed forward and groaned softly.

Wow! Sheldon Cooper was dry humping her, and she liked it! Going by the ragged breathing on her neck, so did he.

Sheldon was sure he was dreaming. In no universe would his beautiful and vibrant neighbor, Penny, be doing this with him. One of her hands slipped back and gripped his hip. She used her grasp to tilt him a bit to the right so he settled between her buttocks more.

Taking a huge risk, Sheldon moved his right hand up under her shirt to her breast. He slipped the lace cup up and caressed her gently. Penny's head fell back against his shoulder and she looked up at him with desire.

"Kiss me," she begged.

Sheldon could no longer resist. He had dreamed of her more times than he cared to admit. He crushed his lips to hers and began to frantically move his erection against her. He had wanted her too long to hold back. Only a minute later he erupted in his pants. Penny's tongue swept alongside his softly.

For several heartbeats the only sound was their heavy breathing. Sheldon kissed her neck gently. He didn't know what to say. Would she be angry later? She had good reason to be, he decided.

"Sheldon?"

He winced timidly. "Yes, Penny?"

"Next time, could we try that without our clothes on?" she asked silkily.

Sheldon stiffened with surprise. "Would…would you want to? With me?"

Penny nodded with a smile. "Most definitely, Sheldon."

Suddenly the lid of the sarcophagus was pulled away. Penny and Sheldon blinked at the sudden bright lights. Two museum workers reached in and helped them out of the confined space. The exhibit was a shambles. A cacophony of greeting drew their attention to one side of the room. All five of their friends were waving to them. They seemed a bit bedraggled, but unharmed. Sheldon and Penny let the EMT check them out and then headed toward their friends. Halfway there Sheldon stopped and looked down at Penny.

"Were you serious?" he asked tentatively. "About , ummm, us?"

Penny ignored the people around them. She ignored the pieces of dismembered mummies lying around. She looked only at Sheldon. "Let's go home and take a shower." Penny looked up at him wickedly. "Maybe you'd be interested in a little water conservation and share mine with me?"

Sheldon was confused for a moment until the implications hit him. Then he smiled broadly. "I believe we should all do our part to conserve."

Penny winked and tucked her arm through his. She loved the museum.