John/Karkat, John/Eridan, commentfic, PG. Fanfiction by Dave Strider.

A peaceful Earth, five major powers united in global governance. An International Space Service, exploring the stars for new homes and signs of life. An ever-expanding Alternia, convinced of its own supremacy, willing to tolerate no threats, willing to acknowledge no others. A species with a history drowning in its own blood, in turning on itself, in destroying anything that seems other, in taking any excuse for a war. (That last one was humanity. Trolls are about to find out they've made a big fucking mistake.)