Dr Stone: Stone Twins [????????????]

Its night time and Seira and Senku are hammering away gathering Sulfur. While Taiju and Yuzuriha are bathing in the hot springs.

"Yuzuriha.. I should tell you about what happened while you were petrified. 3,700 years ago, when I called you to the camphor tree.. Taiju said. Yuzuriha blushed remembering the bold moves Taiju displayed to her.

"What were you about to say that day?" She asked.

"Yuzuriha, for the whole time I was Petrified, I thought about finishing what I was saying.  For hundreds of years, thousands of years... But here, in the stone world, with nowhere to run, I wouldn't feel right as a man telling you." Taiju said.

"Sorry! I'm sure you have no idea what I'm talking about ..." Taiju said.

"No, I do." She said

"We have to bring back civilisation. Once we save humanity, will you let me finish what I was saying 3,700 years ago, Yuzuriha?" Taiju asked.

"Okay, got it. We'll bring the world back. I'm sure of it." She said.

Seira who was listening.  I've waited for thousands of years and this is what I get. Don't fuck with me Taiju teme screw you and your chivalry! She thought.

After Taiju and Yuzuriha were done bathing.
"Senku it's our turn to bath." Seira said and her brother flinched. "What?, why? I'm still collecting my sulfur." He whined.

"Yes, yes now come on, I cant have you dealing with sulfur and not take a bath after. Its unhygienic. She said dragging a struggling Senku to the hot springs. "No! Let me go!" He said struggling to get out of his sister's hold.

*The next day*

"We have the three materials we need to make gun powder." Senku said.

"Yay!" Seira cheered.

"We have them already?" Taiju asked.

"All we need to do now is mix it. It's time for out happy gun powder cooking session!" Senku said.

*In Senku's kitchen *

Senku and yuzuriha are behind a kitchen table, while Taiju holds a camera and Seira has earphones on and holding a clipboard.

"Ingredient number one for gunpowder... Sulfur,which we can get plenty of at this hot spring. Senku said as Yuzuriha pours the sulfur in a bag.

"Number two... Charcoal. We can get all we need buy burning wood." He said throwing bars of charcoal in the bag.

*out of senku's kitchen *

"Number three, the last but most difficult: potassium nitrate. It'll  take a hell of a long time to make this stuff, so...kukuku I've already made some to save us time!" He said, the last part a bit animatedly.

"I feel like I've heard the word 'nitrate' somewhere... Taiju said. "Nitrica acid! Miracle water! You got it from the cave?" He realized.

"You're right for once,simpleton. 10 billion points for you." Senku said pouring the potassium nitrate into to bag. "Potassium nitrate, sulfur,and charcoal all go in the mix, and a pinch of sugar that Seira made as a secret ingredient gives it a little more oomph." He said mixing the contents in the bag.

"This is glucose that I made from grapes." Senku added. "Finally, pound it until it's packed solid." Senku said about to smash it with a log when Taiju comes in with a boulder in his hands.

"Pound it, huh?! Leave the heavy lifting to me! Taiju said.

Yuzuriha stops him. "Are you sure that's a good idea? You might be strong enough to make it spark and go boom! Like flint ." She said.