Shiro x Lances!sister reader ~ long way from home

Lances sister, (y/n) McClain, was what some would consider one of the best pilots of her time until she went on a mission and was never found. This mission was just before the Kerberos mission. Lance is overwhelmed with happiness when he finds his sister out in space and the black paladin seems to take a particular liking to the girl. He swears he's seen her somewhere. But what happens when they learn she might just be the thing they were missing in their quest to defeating the Gulran?

i don't own Voltron (obviously) i guess i kinda own (y/n)? there will also be some other characters that i own~
Side note: I'm lowkey highkey sad that voltrons donezo