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Sheldon opened the door on the second knock.

"Good morning Penny." He tilted his head and looked at her curiously. "How refreshing that you actually abided my rules and knocked. Won't you come in?"

"Um," Penny figited with her jacket slightly. "I'm running late, but um, we should talk.."

"Hey Penny, here for coffee?" Leonard called, walking into the living her at the door.

She gave a half hearted wave and looked pleadingly at Sheldon.

Sheldon slid his eyes towards Leonard and then ushured Penny back out into the hallway, closing the door behind them. "Do you need help with something Penny?"

She looked at him blankly.

He seemed remarkably unnaffected by their midnight mini makeout session.

He raised his eyebrows and checked his watch.

She suddenly took a deep breath.. "About last night.."

He looked at her suddenly with interest and the slightest bit of suspicion. "Yes?"

"Um.." Penny fiddled her hands slightly. "It was really nice.." She bit her lip. "I just wanted to make sure that, you know," She waved between them vaguely, "things wouldn't get strange between us."

He gaped at her, and she winced.

"It is, isn't it?" She nodded to herself.

Sheldon reached for her elbow and held on tighly. "Penny, why would things be strange? We kissed, people do that right? We're people?"

It was Pennys' turn to gape.

She knew she was people, but she wasn't entirely sure about him sometimes..

"Uh, yeah?" She guessed.

Sheldon smiled, a real smile, like the one he'd given her the first time they met and she had asked him about his whiteboard. "Well then, what's the problem?"

Unable to help herself, she smiled back.

"Sheldon, you're sweet." She patted his chest softly.

The door started to open behind them and Sheldon reached back and grabbed the knob, pulling it closed again and holding it there, seemingly effortlessly.

"I should go," Penny smiled, her hand still on his chest.

For whatever reason, it just wouldn't leave... She could feel the beating of his heart beneath her palm, and the sensation intrigued her.. How about that, he really WAS human!

"Just like that?" Sheldon sounded scandalised.

Her eyes flew to his in suprise, and she barely had time to register a teasing smirk on his face before his lips touched hers, his hand holding her head close, his tongue licking at her lips and when she kissed back, in her mouth.. Seconds ticked by, during which time the door knob kept twisting, trying to open.

Suddenly Sheldon withdrew, dropping his hand to his side, his face serene. "Have a good day Penny." He smiled blandly.

She blinked at him, her mouth slightly open, her cheeks flushed. "Oh.. Yeah.. You too, Sheldon.. See you later?"

His head twisted slightly, "Oh I hope so, it's Halo night." He reminded her.

She stared at him, her eyes searching his, noticing a tiny spark of mischief in his eyes, which grew to a smirk as he turned his head towards the door, his eyes returning to hers as he suddenly let go, and the door flew open, and Leonard was heard thudding to the floor.

The look he sent her was pure naughtyness before he leaned in the doorway slightly and said, "Leonard? Are you alright? Whatever are you doing on the floor? Don't you know how unsanitary that is?"

Pennys' eyes widened in shock as Sheldon walked in the apartment casually and frowned at Leonard. "Hurry up Leonard, we have to be at work in half an hour!"

She nearly missed the half wink he sent her as he shut the door.

"Holy Crap on a Cracker.." She finally muttered, descending the stairs slowly. "What else have I missed?"