I know I said in "Rules of Engagement" that this would go up Sunday, but I'm putting off packing, so I tapped this out. Thanks for everyone who has reviewed so far, as well as those of you who have sent me the nicest PMs. I am so glad you are enjoying TPA and this sequel so much!

And I still don't own anything - definitely not in this chapter, at least.

Leonard knocked on 4A's door, thinking again about how odd it felt, to be knocking on a door that belonged to him for more than ten years. He still had a key, but he felt as weird about using it as he did about the fact that he didn't live there anymore.

Sheldon opened the door. "Oh, hello Leonard! Come in. Where's Ada?"

"Raj wanted to take her for another walk." Leonard entered the apartment and sat down in a chair that Amy had brought from her apartment when the Shamy first began to cohabitate. "Can I ask your advice on something?"

"I've told you," Sheldon said, "I encourage all of you to ask me as many questions as possible. Your daughter is very good about that, I must say."

"Yeah, about her," Leonard said, "you need to stop talking about Penny and my sex life in front of her. It's not appropriate."

"Not appropriate?" Sheldon said. "But it's the only way she'll learn."

"She'll learn when she's older," Leonard said, "and when she does, she is not going to be served her parents as an example. And it's definitely not going to be you telling her. More than you have already, anyway."

"You know Leonard, I may not be completely familiar with every type of social interaction, but I'm fairly certain that this does not fall under the category of asking me for advice." Sheldon sat down in his spot. "Are you ever planning to get to that part?"

Leonard sighed. "Yeah, okay. So…it's been determined that Penny has post-partum depression, and I've never had to help someone feeling that way before. So I was just wondering, when Amy…when you two found out that you couldn't have children…what did you say to her? How did you make her feel better?"

"Well," Sheldon said after a moment's thought, "she needed some time to herself. She didn't want to talk about it at first. She was probably in denial about what she was feeling. Eventually she told me about it, it was quite emotional, did you know that even when you're married, some women want coitus to make them feel better?"

"I've heard," Leonard said, hoping he'd just get on with it, as he always complained about others failing to do.

"Well, once she talked to me about it, I tried to take her mind off of it, you know, not allow her to dwell on what was upsetting her. I made sure that she knew that I didn't hold it against her, even when her grief made her become angry with me. It was rough, as I'm sure you remember, but she's fine now."

Leonard nodded. "Sounds like you did everything right."

"I should hope so," Sheldon said. "Your girlfriend is the one who told me how to act." He smiled. "Isn't that funny? I went to Penny for advice on how to help Amy, and now you're coming to me for advice that is presumably about Penny, and I'm giving you Penny's advice. It's like we've got an advice triangle happening here, no, no, advice square. Now, how can we get Amy involved in this? If we don't, then this round is only three people, so we'd be down to an advice triangle. Which, considering we already have an advice square, this would be an advice pyramid, which…"

"Sheldon!" Leonard said sharply, snapping his former roommate out of it. "You're getting to the point where other scientists are having a hard time following you. Come back, please."

Sheldon shook his head. "Sorry. Does Amy and Bernadette and Missy know about Penny?"

"She was going to tell them today, when she took them out to lunch. So if they don't know now, they will any minute." Leonard said.

Sheldon nodded. "She never was very good about keeping a secret." He paused a moment and then looked back at Leonard. "Say. Are you busy for the rest of the afternoon?"

"Not until I have to pick up Savannah and Iris from school," Leonard said. "Why?"

"Well," Sheldon said, "I was just about to put on some Ninth Doctor."

Leonard smiled. "Count me in."

They were less than ten minutes into "Rose" when Leonard's phone rang. Fishing it out of his pocket too late to accept the call, Leonard noticed it was from the school, and waited nervously for the voicemail to appear, tapping his foot much to the chagrin of Sheldon. When the voice mail finally did come through, he held the phone to his ear, using his other hand to cover his other ear and block out the television.

Hello, Dr. Hofstadter, this is Carrie Cicala, the assistant principal at your daughter Savannah's elementary school. Savannah is being held in the principal's office for misbehaving for a substitute teacher, and we'll need you to come and pick her up immediately. We will discuss her punishment further when you arrive. Thank you.

"Oh, my God," Leonard said, standing up. "Sorry, Sheldon. I have to go and get Savannah. She probably started telling her class about how well Penny does me."

"Hey now!" Sheldon shouted, "I never told her that!"

"No, it's…" Leonard paused by the door and decided not to tell Sheldon about Penny's explanation of the verb 'to do' as it applied to people. "Never mind. I gotta go."