Zim X reader History is a funny thing

You are an archaeologist and loved history and studying other cultures most of your life. You your best friend and your team have just found a lost city, but there is strange writing on the wall that none of your team has ever seen before but you and your bestie have. From a little alien from your past that you finally thought you moved on from when he left without a trace only leaving a weird message and a necklace behind for you. All the message said was "Stay out of trouble I'll be back soon wear this at all times! Love you" that was four years ago you lost hope that he would come back. Now with this discovery something in the back of your mind told you that you see your little green friend soon. Based off of Knock on my Door by mysaveplaceishere. https://archiveofourown.org/works/29073915/chapters/71366640.

Cover picture not mine