A/N - I liked the finale for what it was, don't get me wrong-but I effing hate that Penny is pregnant when she explicitly told Leonard she didn't want children. So this is how I choose to fix that problem. Shamy fans, turn back now, I can promise you won't like this one.

As always I enjoy feedback and comments, and thank you for reading! Rock on.

For Sheldon's fortieth birthday, he and Amy throw a huge party and invite everyone they know. With their Nobel Prize money, they have cash to spend on this affair, which they host at a luxurious mid-century modern beach house in Los Angeles (obviously this was all Amy's idea and Sheldon reluctantly went along with it). Raj mans the grill, providing hot dogs and hamburgers, and there is plenty of alcohol available to enjoy as well-Penny makes sure of that, although she does not imbibe herself-for obvious reasons.

"Are you having fun, Mama?" Bernadette asks Penny, after doing three tequila shots in a row with Amy while Penny watches with increasing jealousy.

"Of course! I love seeing my friends getting drunk and then almost drowning in the pool," Penny says, and Bernie laughs too loudly.

"I'll toast to that!" Amy says, doing one more shot than Penny would have advised.

Kripke and Bert are in the corner of the pool arguing about the season finale of Game of Thrones, and Leonard and Wolowitz are watching some Youtube video of the latest particle physics discovery on the patio, preferring to stay in the shade until absolutely necessary.

Penny is sitting by the side of the pool, surveying the action, happy for her friends and the fun they're having. She is also trying not to think about ruining most of their lives with one small sentence, which will have to be done sooner rather than later.

Sheldon extracts himself from Amy for a few minutes and comes over to sit by Penny. They both put their legs in the water. Penny briefly touches Sheldon's toe with hers, which makes him twitch a little. Penny laughs. She knows how much he hates other people's feet.

"Happy birthday, sweetie. I hope you're having fun."

"It's not the worst party I've ever been to," Sheldon admits. "Although I'd much rather be eating Thai food at home while watching-"

"The new Spiderman Blu-Ray, we all know, babe," Penny says. She loves her weirdo friend.

"Yes, that's correct." Sheldon takes a sip of the spiked lemonade Wolowitz made. Penny does enjoy a semi-drunk Sheldon. That's how they got into this mess in the first place.

"So I suppose you haven't told Leonard yet," Sheldon says, looking across the pool at Leonard, who is now eating a hot dog while playing volleyball with Howard. Penny has never been less attracted to him.

"Oh, yeah, I told him last night and he took it really well. He can't wait to raise your baby and co-parent with you and Amy. He's over the moon."

"Sarcasm?" Sheldon asks.

"Yes, Sheldon. Obviously I haven't told him yet. I wanted to wait until after this party. He's so happy right now-he thinks he's going to be a daddy and he never stops talking about it. This baby was going to give him the chance to raise a child the direct opposite of how his mother raised him."

"Why would he want to do that? Beverly is a perfect mother," Sheldon says, and Penny ignores him.

"Anyway. I'll tell him tomorrow night. Are you ready to stick with the plan? I'm not putting my ass on the line if you're going to chicken out."

For a brief moment, Sheldon puts his arm around Penny and she rests her head on his shoulder. This public display of affection is not a good idea, but nobody is watching them, and Penny can always explain that Sheldon was expressing his newfound happiness for her pregnancy if anyone asks.

"I'm ready. Amy thinks I'm going to a conference in Colorado next week and that's why I've been packing in advance."

Penny nods. "Good. But... you don't have to do this, you know. I realize this isn't how you imagined your life turning out. I can deal with it on my own."

"Of course I know that, Penny. And yes, this is not optimal. I made a vow to Amy and I planned to uphold it for as long as I lived, but things change. Now that I've won the Nobel, I find that I am amenable to other possible outcomes. You are carrying my child, and I am committed to you and the baby. We can make this work."

Penny smiles. "We can. I know we can. Have you figured out how you're going to explain this to your mother yet?"

"No. I can't even picture how she's going to react. There's no telling what Jesus is going to think of my actions but I'm sure I'll find out soon." Sheldon sighs and Penny feels the familiar ache of how their lives are going to change so drastically and how many people it's going to affect. "I have to return to Amy now. You are going to tell him tomorrow?"

"Tomorrow," Penny promises, dreading every single second leading up to her telling Leonard that she is actually having Sheldon's baby.

"Then I'll be ready tomorrow," Sheldon says, giving her a quick peck on the cheek. He takes his shiny alabaster legs out of the pool and walks away to find his wife. Penny watches him closely. Although she occasionally had feelings for Sheldon in the last 12 years since they've first met, of course she didn't think they'd end up together. But it feels... kind of right? She doesn't love him, exactly. Not yet. She's hoping that will come after all the guilt from cheating on Leonard with his best friend, and taking her best friend's husband from her, has dissipated somewhat. It's right there on the surface-part of her thinks she's been falling in love with him one small moment at a time for a while now-at least ever since they went shopping together and Sheldon came out looking like a snack in that black suit of his. That's when Penny realized he was way more than a socially awkward comic book nerd.

Penny gets in the pool and swims over to Leonard, who offers her half his hot dog, which she takes gratefully-she's eating for two now. Bernadette joins Howard at the volleyball net and they play together, couple against couple, not knowing that there will be one couple less in the next 24 hours or so.

24 HOURS LATER

Telling him now. Meet you outside in hour. - P

Fine. See you then. - S

It's about 8:13 PM on a Sunday night. They just had dinner-Leonard made a lovely meal of roasted chicken and mashed potatoes, which Penny had been craving for a week. Leonard is sitting at his desk, writing a grant proposal (or something, Penny isn't really paying attention) and listening to a TED talk. In other words, just like every other Sunday night Penny can remember in the last couple years. She has no idea what Sunday nights with Sheldon is going to entail, but she's definitely ready to find out.

This would all be so much easier if she went with her first plan, which was to leave Leonard a note and never speak to him again. But Sheldon vehemently disagreed with that method and convinced her to tell Leonard the truth in person. Penny hopes Sheldon's inherent goodness will rub off on her.

"Hon? I have something to tell you," Penny says. She's sitting in Sheldon's spot on the couch.

"One second, let me finish this sentence…" Leonard says. Penny waits at least two minutes before Leonard turns around. "Okay! What's up? Is the baby kicking again?"

"No, that's not it. But it does have to do with the baby. Um, remember that night when Sheldon and I went out for some drinks and then I came home and was too drunk to, you know… do it with you?"

"Yes… of course I do. The week before is when we made that baby. And as I recall, we haven't 'done it' since then."

Penny nods. The ever-present guilt is starting to make her a little queasy. The questions she asks herself over and over, day and night, are stacking up again-how could I do this to him? He loves me so much and I cheated on him. I'm the worst wife ever. And the like. Penny has always known her morals have been questionable. In a way, she's not even surprised this happened. Her relationship with Leonard was bound to derail eventually, just because she is the way she is. This is what she thinks in her darker moments-most of the time she's able to at least justify it enough to make the guilt go away for a while. But that's not happening tonight. Most likely tomorrow she'll wake up and her other dominant feeling will take over-that she deserves this baby, that her marriage has been a disaster from the beginning, that Leonard cheated on her before they even got married... you know, that kind of thing.

"Well. Sheldon and I had a good time that night. We laughed a lot. He drank more than I've ever seen him drink. He was telling me about winning the Nobel Prize and Amy and the problems they're having in their marriage, and I did the same…"

Leonard looks-well, he looks a lot of things. A bit hurt, a bit confused, a bit angry. He's going to be a lot more of those things in a few minutes.

"Why would you tell him about our issues? We barely even have any. You know I don't want to go around telling our friends everything."

Penny resists the urge to roll her eyes. They have plenty of issues that her pregnancy was just going to provide a band-aid for; before she got pregnant they'd fight every couple of days about both the little things and the big things. From how Penny never takes the trash out to how Leonard doesn't want Penny to audition for anything because he thought her acting days were over. They fought about that one a lot.

She doesn't argue with him on this point, though, because she's the one currently at fault here. "I know. But I was drunk, and I was in a mood. Well, something happened. Something you aren't going to like. I made a mistake. Sheldon and I both made a mistake. When we got in the car to drive back to the apartment, we sort of… ended up in the parking lot of the Pasadena Public Library. And…" Penny doesn't know how to finish this sentence. It's so bad. It's so so bad.

Leonard has started to figure out that his worst nightmare may be coming true at this exact moment. "And what? You checked out some books and went home?"

"No. It was dark and rainy and we were both drunk. One of us kissed the other. Then we got in the backseat and things… happened."

"What are you telling me, Penny? Because surely you aren't saying that Sheldon got you pregnant? That would be utterly ridiculous."

Penny stares at the floor. She's glad she already moved most of her stuff into the car so she wouldn't have to stick around much longer. Can she leave now? Does Leonard have all the information yet?

It turns out he has a lot more to say. Penny listens to Leonard yell, and cry, and accuse, and say all the mean things she knows are true. He deserves to let it all out, she thinks. He deserves a better wife, and she deserves a better husband. They were never right for one another-just because they lived across the hall from each other doesn't mean they are soul mates. It just means they lived across the hall from each other.

While he goes on and on, Penny thinks about how she used to love Leonard at one point in her life-it seems like a long time ago, but she wasn't always dissatisfied and bored with their marriage. She should have done something about it instead of ending up in a backseat with Sheldon, but… it happened. Things can change so quickly.

"I'm going to leave now," Penny says when Leonard has finally run out of things to say. Leonard doesn't argue with her. Instead, he ignores her completely, which she actually prefers. She gets her purse and a few other things from her room, and leaves the past behind.

Sheldon is waiting for her in the lobby. They hurry to her car, and once Penny has driven a mile or so, she stops at a red light. She turns to him and is surprised to see that Sheldon is smiling. Like, a real, actual, human smile.

"How did she take it?"

"Not well, I'm afraid. I believe she's writing you several angry texts or emails as we speak." Penny knows there's a lot more to the story, and that Sheldon is devastated in his own way. Amy was the first love of his life. She hates what Amy is about to go through, but there's no turning back now.

"That reminds me..." Penny says. She lowers the window and throws her phone out of it. It lands with a satisfying thud on the road.

Sheldon, without even thinking about it, does the same with his phone. Penny is shocked but delighted.

"This is the new me. The 40-year-old father of a new baby. The 40-year-old husband of Penny. The 40-year-old Nobel Prize winning scientist. I like the sound of that," Sheldon says. Penny laughs. She can fall in love with this Sheldon. This is a much different version of the 20-something she met for the first time who proudly showed her his whiteboards so long ago. This is the man she may, in fact, spend the rest of her life with-and that doesn't scare her or bore her to tears when she thinks about the prospect.

While the light is still red, Sheldon leans in and kisses Penny gently. She feels an interesting sensation in her belly as his lips meet with hers, and she is hopeful that there will be a lot more kisses like that in her future.

"Let's do this," Penny says. Sheldon nods, and as the light turns green, they drive into their future.