A/N - I haven't written in ages. This little idea came to me during a bout of insomnia (which is balls) whilst watching Game of Thrones re-runs (loving life). Hope you enjoy and it's not too rubbish :)

Penny wandered into apartment 4A, clutching a coffee mug. Her hair was up in a messy ponytail, a dressing gown thrown over her pink tank top and Hello Kitty pajama shorts. "I'm out of coffee," she said to the room, heading automatically to the coffee maker in the kitchen.

"Hello?"

Penny turned around as she finished pouring her coffee. Leonard was wrapped in a towel, holding a comb in one hand. She hid her smirk, turning back to the counter to add some sugar to her coffee.

"Oh, Hello Kitty," Leonard grinned, walking over to the counter.

"Hello Kitty's right, I'm even wearing the matching panties. Though you're a little underdressed for coffee," Penny pointed out, now turning around and taking a sip. "I was out of coffee."

"Oh, I just had a shower and I came out to see who was here," Leonard said, wishing he had a shirt on or something. "Though I should be used to you coming over unannounced for coffee."

"Yeah..." Penny's eyes drifted over his chest, his arms... "So, uh, you're home alone? No work today?"

Leonard nodded. "Priya's gone to work, Sheldon's at work too. I have the day off since I worked late all this week." He sat down, pouring himself some coffee.

"Cool," Penny managed to get out. She found herself wishing that she could use her mind to make his towel fall off. She smirked as she thought of Priya, at work, not here to shun her out of the apartment. And what a great time it was to be in Leonard's apartment. "Good shower?"

Leonard raised a brow. "Umm, it was okay I guess." He picked up his mug. "I'm just gonna go get dressed." He was used to Penny hanging around in their apartment; it was actually kind of nice to see her here, as she wasn't really around much anymore since he had told her Priya didn't like her being there.

Penny moved over to the couch, switching on the TV. She flicked through the morning chat shows, stopping to watch snippets of interviews as she sipped on her coffee. A few minutes later, Leonard came back in, this time dressed in his usual t-shirt, hoodie and jeans combo.

"Anything good on?" He asked as he sat down next to her.

She shook her head. "Not really - usual morning chat show stuff." She shut the TV off and put down the remote. "So how're things with you?"

"Not bad... it's been a bit busy at work, but we've finally solved this huge problem, which means we can continue with the experiment next week. How's the Cheesecake Factory treating you?"

"Oh, same old, same old. I'm a terrible waitress, I get terrible tips, you know the drill." She sighed. "Though I did get a really good tip while working at the bar. Shame he was a total sleazebag."

"Oh, that sucks."

"Yeah, then these other guys were trying to get my number, so..." She grinned mischievously. "I charged them a little extra each time they ordered another round!"

"You didn't!" Leonard laughed.

"They were so drunk by the end of it, I could have charged triple and they wouldn't have known," she giggled.

"From now on I'm double checking what you charge us," Leonard joked.

"One day I'll add on something extra and see if you notice." Penny grinned.

"Well, I'll be on my guard."

She giggled. "I've missed hanging out with you, Leonard."

His heart skipped a beat, hearing her say those words. "Me too." He smiled, patting her knee. "Me too."

Penny looked at his hand on her knee, and covered it with hers, not wanting him to let go. She looked up at him, her eyes flickering between his eyes and his lips. Those eyes which used to tell her how much he loved her, how much he cared. Those lips that knew exactly what to say, what to do, which would kiss her so lovingly yet so fiercely.

All of a sudden, those months of regret and anger and hating Priya didn't exist, and it was just her and him. Sitting so close together, something inside her snapped, whatever forces she'd been using to convince herself she was okay with him and Priya were weakened. At this moment, Penny knew she was never going to be okay with her mistake; she was never going to be happy about Leonard having a new girlfriend.

Leaning in, she kissed him. Softly, lovingly, meaningfully.

"What are you doing?" Leonard asked quietly. Not that he didn't like it.

Penny looked at him, her eyes strong. "I miss you, Leonard." She kissed his neck. "So, so much." She pulled back, looking at their still joined hands. "I know you probably don't miss me in the same way, and I'm a bitch for doing this... I'm sorry." She felt tears begin to form in her eyes, and averted her gaze to her feet.

"Penny," He lifted her chin gently, turning her so she would look at him. Her eyes were swimming with tears, and he brushed a tear away as it rolled down her cheek. He tilted his head and kissed her.

After a moment of surprise at his forwardness, she kissed him back, her heart racing. Oh God, he was such a great kisser. She let out a small gasp as he started to kiss down her neck, remembering her most sensitive spots.

"This... is wrong," she breathed, as he worked his way back up to her jaw. "You have... you have a girlfriend."

"Shh," Leonard looked at her, his eyes filled with passion. "I've missed you too."

As his lips found hers again, one of his hands tangled in her hair, the other went around her waist, pulling her closer. Penny wrapped her arms around his neck, moaning into his mouth as he deepened the kiss.

"Crap," Leonard shot up suddenly, looking at the message on his phone. "Priya and Sheldon are on their way back, she just picked him up."

"Oh God," Penny jumped off the couch, quickly pulling on her robe and grabbing her pajama shorts and tank top from the floor as Leonard hastily put his clothes back on. She grabbed her coffee mug and walked briskly to the door.

"Thank you, Leonard," She said shyly. "That really was... amazing."

He smiled. "I know," He leaned in, giving into weakness one more time and kissing her. He wanted to hold on, to never let her go, but he knew this wasn't the time for that.

She gave him a small smile as she rushed across the hallway into her apartment.

Leonard shut the door, and began pacing. He missed her, so, so much. He would be lying to say he didn't still have feelings for her. But he'd moved on from her, right? He was with Priya now, in a serious relationship. Knowing Penny missed him too, that was... well. But he wasn't the kind of guy who cheated. Leonard was the good guy. He had always been the good guy.

Had.

Penny opened the door.

Priya stood there, anger written all over her. No, it was more than anger. It was fury, outrage, pure hatred. Her arm outstretched, she held a small plastic bag. Cautiously, Penny took it and looked inside. Her heart stopped. Those pink panties with the little Hello Kitty printed on the waistband she'd worn just a few days ago, which Leonard had torn off her on the couch. She'd forgotten to put them back on, that she'd even been wearing them under her pajama shorts. She looked back up at Priya, who looked like she was going to murder Penny.

Penny didn't know what to say, and even if she did, her throat was so dry, her heart was beating so fast and her chest so tight that she wouldn't have been able to anyway. She backed away, suddenly terrified of this woman, and shut the door slowly as Priya dropped her arm and furiously stomped back to Leonard and Sheldon's apartment. Penny saw her pause outside the door, and adopt a smile as she walked in. She heard a "Hey, I'm home!" and Penny knew: Priya wasn't going to tell Leonard that she knew.

Shutting the door fully, Penny leant against her door, dropping the tiny plastic bag. She had been reckless, careless, stupid. She couldn't go back there now. This is the price she was paying for that morning with Leonard; a few hours of happiness, wrapped in his arms, wishing she'd had the courage months ago to tell him 'I love you too.'