Okay, so I've watched the original Voltron. I want to do this so bad. I've struggled putting up a setting for it though. Despite that, here ya go...

Also I'm not even kidding, the original is pretty different...
I will change how Keith and Allura are together, I'm definitely changing that.
"Paladins, this could very well put you in another reality. It's dangerous." Allura said urgently.

"We know, but we have to save this planet." Shiro continued forward and the others followed all in their lions.

"But last time with the evil Alteans and Sven-." Allura tried to talk them out of it.

"Allura, we are aware of the risks. All we can do is pray it's a peaceful alternate reality." Shiro said and with that they entered through.

They were in space again and spotted the planet heading for it immediately. "Shiro, take a look at that." Pidge chimed in.

Down bellow there were 5 very similar lions flying towards it as well. They almost in a way seemed older? They landed and immediately armed themselves as did the paladins of the other lions. But all 10 were speechless at the sight of themselves.

Lance looked more stern and wore a large brown jacket. Keith seemed to be a little more in awe and wore a red jumpsuit. Pidge was much shorter wearing a green jumpsuit, hunk looked almost exactly the same. Allura was wearing a pink jump suit and had yellow hair with light skin. There was no Shiro.

(Instead of Shiro there was a guy named Sven and he piloted the Blue Lion for a while but later couldn't and was replaced with Allura.) ^remember Shiro in the alternate reality was Sven. *eyebrow wiggle* Those sneaky little...

"We shouldn't trust them! This is probably a trick!" Alternate Lance said sternly.

"Calm down Lance, we can try talking to them." Alternate Keith said much kinder.

"Woah woah woah, hold the phone. My name is Lance." He intervened.

"Shut it! We weren't talking to you!" Alternate Lance snapped.

"Lance calm down. You say your name is Lance as well. Where are you all from?"

"We are from an alternate reality. We are the paladins of Voltron." Shiro said intervening. "Everyone lower your weapons."They did as they're told Keith was more hesitant.

Upon seeing this alternate Keith nodded to the others to lower theirs. Alternate Lance was more hesitant. "Keith I'm assuming?" Alternate Keith asked looking to... well... Keith.

"Yes." He said coldly folding his arms still not trusting him.

"I am Keith, paladin of the black lion. I assume you are as well?"

"No, I'm the paladin of the black lion, Shiro." He stepped forward reaching out a hand.

Alternate Keith took a step forward to shake it but the Lance stopped him. "Keith what if he's dangerous?"

"It's fine babe, we won't make it anywhere just standing here pointing our weapons at one another." Keith said putting a hand on his boyfriends shoulder for comfort. He then walked forward shaking his hand kindly. Alternate Keith and Lance were practically switched.

"W-wait, did Keith just call you babe?" Lance was completely red.

"Yes, he is my boyfriend." Alternate Lance said annoyed as if it were obvious.

"Oh, okay." Lance simply glanced at Keith to see his face was red as well and slightly confused.

The normal paladins began to laugh considering they already know the two have major crushes on each other.

Shiro briefly explained the mission to alternate Keith and he agreed they'd help. After all, two Voltrons are better than one.

"Hey, so about the whole you and Keith are dating thing?" Lance asked sitting next to himself.

"Yeah, we've been dating for about three years." Alternate Lance said slightly annoyed.

"Are you serious?! That long?!" Lance's mouth hung open in shock.

"Yup!" Keith chimed in sitting next to his boyfriend and kissing his cheek.

"Okay, whats with that?" Lance raised an eyebrow.

"With what?" Alternate Keith asked.

"You're so much more happy and cheery and I seem so grumpy." Lance laughed.

"What? Lance is just a hothead. That's why he's perfect for the red lion." Keith held his hand smiling and Lance rolled his eyes.

"Whatever, you were such a flirt." Alternate Lance smiled at his boyfriend.

"Me and Keith are the opposite." Lance laughed. "He's the hot head."

"Keith? Never." Alternate Lance scoffed.

"It's true!" Lance laughed. "I mean I know I've had a crush on Keith for a long time but I don't think he likes me back, he probably hates me. After all I kind of made us rivals. We fight kind of a bit."

"So? We did too. I kind of made a rivalry between Lance and I. But once Lance realized that he was actually mad in love with me I thought he was kind of cute." Keith teased.

"Oh whatever!" Lance laughed giving Keith a small kiss. Lance watched the two awkwardly.

"Oh sorry," Keith looked back at the real Lance and smiled. "What were trying to say is, Keith probably likes you back. Wow, It's weird talking in third person."

Lance looked at Keith talking to Shiro looking stern as per usual when they caught eye contact. Keith quickly blushed and looked back at Shiro embarrassed. "Alright, I'll give it a shot." He smiled widely and thanked them.

They all headed back to their lions and carried out Shiro and Alternate Keith's plan. With the strength of ten lions they managed to push the planets back through the portal before the five retreated back to their reality.

The paladins got back to their hangers and stepped out making their way to the control room. Everyone was talking about the amazing mission and their alternate selves. Everyone except Keith. Lance sped up and walked next to him letting all the other paladins go ahead and eventually out of sight.

"Heh, so us, right?" Lance laughed.

"Yeah, crazy." Keith avoided looking at the taller boy walking next to him.

"Maybe not." Lance said surprising Keith. "Look, Keith, I've kind of had a crush on you for a long time and well-."

Keith smashed his lips into Lances. Both boys slowly sunk into the kiss. When they parted they looked at each other in shock. "I've probably had a crush on you since the bonding moment."

"Since just the bonding moment?! I've had a crush on you all the way back from the Garrison!" Lance pouted slightly.

Keith laughed and Lance kissed him.