In between dimensions. Author-Chan used the dragon balls to make this area so that we can prepare for this.....ULTRA DARE!

"I dare Evil 21 to fight MUI (Mastered Ultra Instinct) Goku without holding back."

Me: ok. Are you guys ready?

Evil 21: oh Goku. I can't wait!

Good 21: no fair. She gets fight him. *starts thinking about when they kissed and starts blushing*

Me: *pats her back* its ok.

Goku: *goes Ultra Instinct-Post form* lets see if you can bring out the mastered form.

Me: and...

Good 21: BEGIN!

-3rd person-
Evil 21 charged as Goku stood there, full of excitement for this waited rematch with 21...well one of them. Goku jumped back, dodging her. 21 pointed her finger at him.
"CAN..." Before she could fire, Goku had already fired a quick Kamehameha wave, blowing her back. She skipped off the ground and jumped to her feet.
"Alright. Let me give it back. Kamehame..."
"Alright then. Kane..." Goku started. "Hame..."
"Hope you're ready Goku, Deary~!"
"HA!" Goku fired first.
"Hehe." She vanished.
"What?! Uh?"
"Sorry my sweet..." She had used instant transmission and was now over him. "But I had to take advantage...HA!" Goku was wide open and had no choice but to take the hit. It pushed him to the ground and exploded. As she looked through the smoke, she was his by a blue, stretched out energy strike. It knocked the breath out of her, also sening her flirting into a mountain.

__________
Me: wow. This is intense

Good 21: I know right. *eats cake* want some?

Me: sure. *eats*
__________

Goku took a deep breath, as a giant aura stretched across the ground. 21 got up and looked down at him.
"Grrr! Ahhhhhhhhhh!" Her aura rised. "You're mine! All mine!" She created a giant orb. "Here! Have it!" She threw it at him.

Me: GET DOWN. *jumps on good 21*

Good 21: evil!
Huh?

Me: um?

The orb had vanished, along with Goku. 21 looked behind her, and there was goku covered on a blue light, holding a small orb that looked like 21's. He flicked it away into nothing. 21's face looked shocked. The blue light faded, and Son Goku has white hair. He was in the mastered formed of ultra instinct. 21 swung her tail but he had gone by her faster then she could see. She then felt a dozen blows at once before falling over.
"Give up 21. You can't beat me."
"Hehehe."
"Hm?"
"No need to rush things." She stood up smiling.
"She's...all healed up?! Oh I forgot."
"My healing factor. Its greater then any other."

Me:wow. Its not gonna be an easy fight to win.

Good 21: um...author-chan?

Me: but she's no where near Goku's power. What is she planning?

Good 21: author-chan.

Me: hmmm. Wait. Maybe she's...

Good 21: AUTHOR-CHAN!

Me: huh? Yes 21?

Good 21: *blushing brightly* y..you can get off of me now~.

Me: *blushes* ah! Sorry sorry. *rolls off*

Evil 21 charges again but every attack was dodged, caught, deflected, or did nothing. She got repeatedly hit every time. She now hits the ground.
"You done?" Goku asked.
"Never." She said as she was fully healed again.
"You don't know when to quit huh?"
"I'll never surrender..." To short energy swords appeared around her hands. "To you goku!"
Goku was about to step forward but something wrapped around his foot and pulled him into the ground. Now 21 was right in front as she swung.
"Huh?"
She continues to stab at goku.
"Umm?"
And each attack, hardly even hurt so goku sat there and wondered what she was doing. Then, she since that she was getting stronger with each strike. Her power level was raising faster and faster. He roared, creating a shockwave the blew 21 away, and shaking this dimension. He stood up and stared her down.
"So. All those sword strikes. You were actually draining my energy."
"Exactly! And I feels...it feels...ABSOLUTELY DELIGHTFUL!" Her power shot up. She was surrounded in a blue red and black aura. And as it faded, her hair was...well white but it glowed like silver and white like Goku's.
"So. Was this your plan from the start?"
"Yes Goku my sweetie~ yes it was." She licked her lips.
"Heh. I can't wait to get this fight going!" His aura stretched upward.
"Yes. Yes Goku~ Neither can I! AHHHH!~~" hers did as well.

Me: 21. You might wanna hang on.

Good 21: *wraps tail around me* ok. But I wonder who's gonna win.

Me: I don't know. I don't know.

They charged, hitting each other at the same time. They were back and forth, toe to toe, fist to face. Goku flew up then charged a giant white ball. 21 charge a giant black and red ball. They smiled and threw them at each other, causing a colossal explosion, destroying everything nearby. The area was as flat as a fighting stage. Goku and 21 stared at each other.
They both roared their hearts out.

Both: KAAAAAAAAAAAAA *they run at each other* MEEEEEEEEEE *their aura gathered into the ball* HAAAAAAAAAAA *they run faster* MEEEEEEEEEEEEE *they stop in front of each other* HA...?!
They both stopped and coughed up blood before screaming out in pain. The MUI energy had run out and now, they're drained. They look at each other and have each a proud smile, 21 more of a smirk. Then they collapsed.

Good 21: *breaks out of rocks* Author-Chan? Where are you?

Me: I'm...under...you...

Good 21: Author?! *helps up*

Me: thanks.

Good 21: so. Its over.

Me: yeah...*coughs*

Good 21: you ok?

Me: your tail is crushing my ribs.

Good 21: *blushes and unwraps tail from me* s..sorry.

Me: c'mon. Lets grab them and call it a night.

Good 21: ok. Thank you all for your time asks and dares. Author thanks you for all your lovely support. Hope to get more fun dares in the future.
~💋CHU💋~