Shiro needs a haircut, and he already knows that Keith is good with knives. There's only a certain number of things which could possibly go awry, right?
Fanfiction for - Voltron: Legendary Defender
You need no background at all to enjoy this story (I promise) the only vaguely pertinent information you need is that this is set in the future and that these guys all attend a place called the Galaxy Garrison where they are training to be astronauts. You don't need to have watched the show.