A/N - I got lots of Lenny feels yesterday watching the S6 Extras (my box set finally arrived, a day late) so I ended up writing this. Hope you enjoy :)

"You got the plan?" Penny asked, crouching down in front of her daughter once she had locked the car.

"Yeah. We gonna go Daddy's lab, but you gonna go toilet. Then I say to him if he thinks we got a boy or a girl in Mommy's tummy."

"Excellent." Penny grinned, standing up. "I'll buy you some ice-cream later. You ready to go?"

"Yeah!" Isabel giggled. "I like making a surprise for Daddy."

"Good. Okay, sweetness, get up here, Mommy's gonna carry you while she still can." Penny held her arms out to Isabel, who jumped into them so Penny could carry her on her hip.

Along the way, Isabel waved at everybody they passed, and Penny gave small grins to those that she had met before. A few of them stopped to say hello to 'little Isabel Hofstadter' and 'the lovely Mrs. Hofstadter' and tell Penny 'oh how she's grown since Leonard last brought her to work'. Of course, all the attention was on their daughter - Penny often visited Leonard whilst their daughter was at pre-school or at a play-date.

Once they arrived outside Leonard's lab, Isabel knocked on the door with Penny's encouragement, and she stepped inside.

"Hey!" Leonard grinned, looking up from his notebook, walking over to greet them. "I wasn't expecting a visit today!" He gave Penny a quick kiss and then took Isabel from her, spinning her round before settling her on his hip. "How's my little princess?"

"I picked my dress today, Daddy," Isabel said proudly. "And I got dressed by myself."

"She's all grown up now!" Penny grinned at Leonard. "I'm just going to pop to the bathroom."

"Alright," Leonard nodded, walking into his lab properly once Penny had left. He moved his papers over and sat Isabel down on the desk, which she always enjoyed, before sitting down in his seat. "You do anything exciting today, sweetness?"

"Watched TV and went to the shop with Mommy." Isabel shrugged. "I saw Jennifer and her mom at the shop. Jennifer's gonna get a baby sister, her mom told me so and her mom is fat now."

"Isabel, she's not fat, just bigger, because she's carrying a baby."

"Do you think I'm gonna get a baby brother or a baby sister?" Isabel asked, her face curious.

"I... I don't know, sweetness. Do you want a brother or sister?"

"Yeah, I think it's gonna be a boy." Isabel stated matter-of-factly.

"Uh... you think what's gonna be a boy?"

"In Mommy's tummy."

Leonard stuttered for a moment. "Wh-what?" He wasn't sure if he was just over-interpreting what his three-year-old daughter was telling him, or if Isabel had just effectively told him that Penny was pregnant.

"Mommy says we not gonna know for a long time but I think it's a boy, 'cos then we have two girls two boys and it's fair." Isabel said, before adding "and two is an even number, you told me that Daddy, 'member?"

"Umm..." Blank faced from shock, Leonard just stared at his daughter as she continued talking animatedly as though she hadn't just told her father that his wife is pregnant.

"Anyways, Mommy said if it's a girl it's gonna be lots of trouble because two Izzie's is lots of dresses and lots of princess stuff. But if its a boy then my bedroom can't be pink but that's okay. Julia gotta share her bedroom with her little brother and Miss Cook said we gotta share."

"Uh..."

"Daddy!" Isabel suddenly sat up excitedly, changing the topic in the way only a three-year-old can. "Can I draw on that big whiteboard?"

"Ah, umm..."

"So I'm guessing she told you?" Penny stepped into the lab, grinning at the expression on Leonard's face. She stepped over to her daughter, holding out her hand. Isabel raised her own little hand, grinning, and high-fived Penny. "Great job, Is. Here, take these markers and you can draw on the whiteboard behind you while I talk to your Daddy."

Isabel took the markers Penny had held out to her and turned around, kneeling up on her knees as she pulled the lid off the blue marker.

Penny smirked at Leonard and then walked across to the other end of his lab. "Wow, this looks like a pretty awesome experiment."

"I..." Leonard sat there for a moment as Penny simply look at the set-up on the table to his right, before he managed to get himself out of the chair and walk over to her. "You..."

"Yup." Penny nodded, and despite herself, she felt her eyes glaze over slightly with happy tears. "I'm pregnant, Leonard."

"Oh my God," Leonard pulled her into a hug, wrapping his arms tightly around Penny, as hers came around his neck. "It's even more amazing when you say it."

"Mm." Penny relaxed into his arms. "It feels amazing to say it."

Leonard chuckled, and pulled away, holding her arms. "Well, you told Izzie first."

"Hmm, it's not quite the same as telling you though." Penny giggled. "I just thought your reaction would be hilarious if our daughter was the one who told you I was pregnant. It was so worth it."

"Yeah, I should have figured something was up when you came in here with Is." Leonard smirked.

"Shut up," Penny shook her head, leaning in to kiss him on the lips.