Disclaimer: I do not own Thunderbirds Are Go.

AN: So just watched Season 2's Lost Kingdom, and squealed upon realising that the episode was full of references to do with this AU of Penelope and John being siblings. This is one of the rare longer ones I have, so...yep. Enjoy!

Big thanks to Eraman and meme12345bunny for reviewing!

"…and I couldn't do any of this if it wasn't for my helpful assistant," Francois Lemaire declared with a flourish.

"Biographer and wife," the lady cut in, crossing her arms.

"Madeline." Lemaire finished, as if his wife hadn't said anything. He opened his mouth to continue, only for a red signal to start flashing from where he was recording. He scowled as a hologram of Lady Penelope Creighton-Ward appeared.

"Mr. Lemaire, on behalf of the-"

"How dare you jam my signal?!" Lemaire demanded indignantly. "This is a broadcast of the utmost historical value-"

Playing his game, Penelope also cut in before he finished speaking. "As is your location, which you could be permanently damaging by your presence."

Lemaire's tone turned condescending, a leer on his face. "Is somebody jealous that someone else got here first?"

Penelope glared at the man, her upbringing the only thing stopping her from outright snapping at him. "Somebody is trying to stop someone else from destroying priceless artifacts. So with the full authority of the World Council, I order you to leave the area."

Lemaire sighed dramatically, but even he wouldn't dare mess with the World Council. "All right, all right, I was only trying to bring a bit of culture to the masses."

Almost as if on cue, John's hologram appeared. "Your submarine is in a live seaquake zone, Mr. Lemaire. I strong advise you to leave as fast as you can." Penelope hid a smile at how her brother had come to back her up…as he always had.

Unfortunately, Lemaire didn't seem to share the sentiment. He crossed his arms, rolling his eyes. "What is this, the international rescue babysitting service? I'm well aware of my location, thank you." He abruptly cut off the connection, leaving both Creighton-Wards still on the line with one another and absolutely furious with the rich man.

"The nerve of him!" Penelope burst out, crossing her own arms with a huff. Parker let out a small snort of amusement, even as John nodded.

"Tell me about it. With our luck, we're probably going to have to rescue him when he does something stupid to get him and his wife to leave."

"Why on earth are they still married?" Penelope frowned. "I would have thought that the money would stop being such a strong motivator."

John shrugged. "Well, as father once said, love blinds all. I'm gonna go, Penelope. I advise you to get out of the area as fast as you can too, unless you want to get dragged in rescuing Lemaire."

"Duly noted."

Unfortunately, Parker refused to exceed the speed limit and Penelope was roped into rescuing Lemaire. It was also unfortunate that it had been Virgil that had called her…he was one of the only brothers she couldn't say no to.

And then she found out that the fool had gotten Gordon in trouble too.

Oh, and Brains as well.

And Max.

She cleared her throat as FAB1 made its way down the ocean. In a few minutes, the car was emerging from the depths, and she cut off the line to Gordon, opening a new one to John.

"Looks like one good sneeze could bring the whole place down." Parker remarked upon seeing the debris.

"There's no time to wait. You'll have to blast through. When this quake hits, it's not going to take any prisoners, and I don't want you in there when it happens." John's voice was steely.

Even though he had replied to Parker's comment, it was clear that he was talking about Penelope. Penelope let out a small smile at her brother's concern. It was rare that he would let that brotherly instinct appear during a mission. However, that only reinforced how dangerous the quake was, that John would worry like this.

"FAB." Penelope smiled at John, before her expression hardened.

"H'arming the missiles, m'lady."

Penelope opened the connection to Gordon again. "Gordon? Parker is standing by to fire the missile."

Before Gordon could reply, Lemaire's voice broke through.

"Do not fire a missile at my submarine!"

Penelope's eyes narrowed as she responded. "I wouldn't need to fire anything at all, if you haven't led my friends into the situation." Snapping her compact shut, she allowed herself a nod of satisfaction at having the last word. Admittedly, it was childish, but something about Lemaire just seemed to encourage these childish squabbles.

"How are you?" Was the first thing John asked when Penelope called, like she usually did at the end of a mission.

"I've been better." Penelope fumed. She had been stuck with Lemaire talking about nothing but himself for the better part of an hour, and she was severely regretting not strangling the man when she had the chance. Parker could've easily taken out Madeline, and no one would be the wiser.

John's expression softened. "I know that tone. Penelope."

"He's such an arghh, and the nerve of him, thinks he's king of the world!" Penelope ranted, scowling at the mere thought of Lemaire. "Do you know just how idiotic the man is?! How he made his money I will never know."

John cracked a grin. "Tell me about it. Same thing for us with Langstrom Fisher."

"Ah." Penelope's expression darkened at the stupid man who had nearly gotten her brother killed in 25G.

"Don't look so grim, Penelope." John chided her gently. "I survived. You survived. We live to fight another day."

"I'm going to murder them one day, and the public will thank me for it."

"Considering Lemaire is essentially a superstar, I wish you the best of luck. I'm not going to bail you if you get caught." John warned, only half-joking.

Penelope huffed, not allowing herself to slouch. "Stupid man." She repeated, for lack of anything else to say.

John laughed, and Penelope relished the rare sound. He then glanced at the side, and a small smile seemed to light up his face.

Penelope tilted her head, wondering what would get him to smile like that.

"Captain O'Bannon is here. I'll see you later?"

Penelope was unable to help a mischievous smile, but nodded obediently. For the time being. And then she could tease John all she wanted. She really needed to meet O'Bannon and see what exactly about her had had John inviting her weekly for zero-G handball.

"See you later, John."