A series of Alternate Universes (AU with a few in the canon universe) mostly one shots with a few multi-parters all about that Starco.

There are things you learn when you travel with someone close to you. Sometimes those things you learn are about the person you're with. Sometimes they're about yourself. Star and Marco share a few moments together that test their definition of their friendship.

In the aftermath of the Covenants civil war, a lone marine imprisoned on High Charity is on the brink of suicide, unwilling to become a victim of the Flood. Before he can take his life, he will meet one who brings him new purpose. [This a re-upload of a story I deleted some time ago, so it includes retrospect notes before and after the beginning and end of each chapter].

Star is ready to become a Queen and she will soon leave Earth to pursue her royal duties on Mewni. Despite being more than happy for his magical friend, Marco realizes that he may also have deeper (and unspoken) feelings for her. Things get a bit more complicated when an ancient evil, Lord Deimor, threatens to unleash The Darkness and put an end to the entire Universe. [STARCO]

It's Star's sixteenth birthday and with her sixteenth birthday come some very big changes that she's too scared to share with the Diaz family, making her hide from them. When Marco finds her, both of them are surprised by the outcome. One shot, Starco!