Sveith

Sveith is the slash ship between Sven and Keith from the Voltron: Legendary Defender fandom.

Season 3
In "Hole in the Sky," Team Voltron gets a distress signal from an Altean ship. Allura is adamant they check it out. They cross through to an alternate reality. After searching for an beings in distress, two figures drop down from a ceiling hatch. One figure takes aim for Lance, Keith cuts his gun, the two then engage in hand-to-hand combat for a moment before the figure gets the advantage over Keith by landing a powerful kick, knocking him down. The figure goes for Lance again, but Pidge is able to save Lance by breaking the man's helmet, revealing his face. Keith is stunned when it's Shiro's face he's seeing. As the man takes aim at him and the others, Keith raises his hands and deactivates his weapon, saying, "Shiro, please." The man immediately replies back, "My name is not Shiro."

Later, Lance, Hunk, Pidge, Slav and Sven enter the room Keith and Allura are in, they in handcuffs being escorted by the Alteans. Upon seeing this, a fight breaks out and the bombs Sven and Slav planted earlier go off. Everyone starts running down a hallway, shooting droids. Sven leaps to shove Lance out of the way, taking a hard hit to the chest. Slav tells them to get to their Lions while he stays back with Sven.

It's unknown if Sven survived.

Fanon
Some Sheith shippers like to ship them for the potential angst: Sven and Keith finding bittersweet comfort in each other from being away from their beloveds; Shiro for Keith, Akira for Sven.

Fandom
AO3

TUMBLR

Trivia

 * When Keith and the rest of Team Voltron believed Sven to be their Shiro, Keith was the only one to lower his weapon.