Word Count: 1199
Summary: They have a set of rules of the relationship. [The Holiday Summation, S10E12]
Disclaimer: I don't own The Big Bang Theory or the characters.

"You broke a rule." Leonard states, and Penny just sighs, knowing very well that he's right, even though she would probably never willingly admit that.

He gets up from the couch he was sitting in and goes to his desk, where he opens a drawer and retrieves a piece of paper.

"See?" He hands her the paper he had taken from his desk and looks at her smugly, knowing he won the battle – this time.

Penny sighs again, refraining from rolling her eyes at her husband's posture, wanting nothing but to take him to their bedroom, because she always had a thing for that 'I know what I'm talking about' look of his.

In that piece of paper were the following words:

Rules of the relationship

1. Girl's night and comic book nights are meant to be respected. Nothing can be put on Wednesday nights and on the nights girls decide to hang out.

2. Penny can only go to Leonard's lab once a week and not even one more day. If she goes more than once, he won't be able to have any work done.

3. If Leonard and Penny start a show together, they cannot watch it alone, even if they have to wait a week until they can watch it. Start a show together, end the show together, laugh together, and cry together.

4. Penny will not wear Leonard's clothes that he was planning on wear the next day. If that happens, she'll do laundry for him.

5. ̶I̶̶f̶̶ ̶̶P̶̶e̶̶n̶̶n̶̶y̶̶ ̶̶w̶̶a̶̶n̶̶t̶̶s̶̶ ̶̶t̶̶o̶̶ ̶̶p̶̶l̶̶a̶̶y̶̶ ̶̶w̶̶i̶̶t̶̶h̶̶ ̶̶L̶̶e̶̶o̶̶n̶̶a̶̶r̶̶d̶̶'̶̶s̶̶ ̶̶h̶̶a̶̶i̶̶r̶̶,̶̶ ̶̶s̶̶h̶̶e̶̶ ̶̶w̶̶i̶̶l̶̶l̶̶.̶̶ ̶̶T̶̶h̶̶a̶̶t̶̶ ̶̶m̶̶e̶̶a̶̶n̶̶s̶̶ ̶̶n̶̶o̶̶ ̶̶m̶̶o̶̶r̶̶e̶̶ ̶̶g̶̶e̶̶l̶̶ ̶̶o̶̶n̶̶ ̶̶h̶̶a̶̶i̶̶r̶̶.̶̶ (Not happening Penny, you know my hair gets way too messy sometimes!)

"I still think you shouldn't have crossed out number five here." She points out, a devilish smile crossing her lips.

Leonard stays in his place, rolling his eyes, arms crossed. He is not going to go down without a fight.

"Number five is not going to happen. As much as I love you, and love when you play with my hair, you know how this thing" he points to his hair "is very… how can I say it? Unstable. Let's go with unstable."

"Fine. But I think we should put a rule here regarding your hair."

"Nice try, Penny. I haven't forgotten about you breaking rule number 3." Penny looks to the floor, biting her lip.

"Yes. I've been naughty." She gets up from the couch and heads towards her husband. Her arms immediately go around his neck, and he gulps. She's looking at him with her best sexy eyes, but he doesn't cave.

"Penny." He groans, and raises his eyebrows. "I'm adding a fifth rule. Whenever I'm talking about rules, you cannot flirt with me. Understood?" He untangles himself from his wife's arms and moves to his desk, writes the fifth rule down and looks back to his wife. "Now you broke two rules. Happy?"

Penny plumps on the couch, immediately crossing her arms in defeat. "Fine. I broke two rules. But in my defense, I technically only broke one rule, because the actual fifth rule wasn't written until after I flirted with you." She gives him a weak smile, and he takes a deep breath.

"Whatever. You broke a rule."

"You couldn't expect me to wait, right? I wanted to know what would happen next."

"You only had to wait a few hours." He uncrosses his arms and turns his back on her, going to the fridge to get a bottle of water, and then comes back. "It wasn't that difficult."

"Maybe to you. You were working, you had a way to keep your mind off of the show. But I didn't. The girls were working, so I couldn't hand out with them. I had already gone to your lab yesterday, and didn't want to break rule number two. And I couldn't wear something of yours, because then I would also break rule number four. Out of all of them, I figured that rule number three was the best one to break."

Leonard shakes his head, but there's a little smile playing on his lips. He lost the battle. Again.

"You know what? I'll let this one slide."

"Really?" Penny asks, quickly perking up.

"Yes. And I'll even do you one better."

He goes to his desk and grabs a marker, and writes something down, something that Penny can't see.

"What did you write?" She lights up for a moment, like if a lightbulb light up inside her head. "Is it a rule about your hair?"

"What? No." He shakes his head, and then gives her the paper.

Rule number 2 was partly crossed off, and Penny wonders for a moment what he could have possibly have written. She looks up at him, and he is grinning at her, which makes her question what he wrote down.

2. Penny can only go to Leonard's lab once a week, or when she's about to break rule number 3. If she goes more than once, he won't be able to have any work done. If she goes twice (or more) Leonard can do whatever he wants with his hair.

She smiles, but then looks at him like she's slightly angry at him.

"Sorry, but I did what you wanted." Penny glares at him, and she seems ready to throw him from the window. "You said you wanted a rule regarding my hair."

"I hate you so much sometimes." She simply says, and turns away from him. Usually, if anyone would tell him that, he would probably look a little hurt. But not when Penny tells him that. Because he knows it's not true.

"Too bad that I love you then, huh?" He asks, smiling. She turns to him again, and walks towards him.

"Yep. Too bad indeed." She keeps her face bland from emotions for as long as she can, but eventually caves when Leonard wiggles his eyebrows at her, which makes her laugh.

"Seriously? You're laughing?" Now he looks hurt, but he's only pretending.

"I'm-I'm really sorry." She tries to stop her laughter, but every time she's able to stop, she looks at him and starts all over again, which makes Leonard laugh too. Eventually the laughter dies out, and Penny can finally speak. "I haven't decided if I want to kiss you or shove you off a bridge." She says that with such sincerity in her voice that Leonard is slightly scared, even if it is for only a moment. But then a grin appears in his face.

"Can I pick?" Penny rolls her eyes playfully at him, and then stares at him. Biting her lip, she tries not to laugh, but fails once again, which makes Leonard smile.

She puts her arms around his neck like she had done before and his arms go around her waist almost automatically.

"Yes." She whispers, and it takes him a moment to register her answer, but once he figures it out, their lips are together.

"Now, I remember someone saying something about being naughty?" Leonard asks, giving her a suggestive look, his arms never leaving her waist.

They basically run towards their bedroom, the list of rules completely forgotten.

The End

I thought this piece was going to be a continuation of an episode from season 12. But it appears that the episode that based this was actually from season 10. I had no idea, but now I know.

Anyway, I hope everyone likes this.