40 years passed since Sean had made the first of the boys at his school a twink. Since then, the twink virus (or, as it is known to scientists, homosexualitatis admittendam infectio) had spread around North America. Being too dumb to pilot planes or captain boats, the twinks were mostly limited to land travel.
Canada, the USA, Mexico, and everything else all the way from the tip of Alaska to the Panama Canal, had united into one big supernation (the United States of Gay), with the new capital in San Francisco. The outside world has mostly kept it contained, but it spread across to the Bahamas and somehow jumped all of the way to Japan and South Korea.
South America kept it bottled up at the Isthmus of Panama, with any twinks attempting to cross dying to bullets, native darts/arrows, drowning in the swamps or rivers or getting lost in the jungles, succumbing to the mosquito-ridden diseases, or just turning around. The twinks failed to cross into Russia from Japan and Alaska. It was kept bottled up in South Korea by massive amounts of funding from the rest of the world building a huge wall across the demilitarised zone in North Korea, with Kim Jong-Un becoming a saviour of the world. The same went for Cuba and its now massive patrols of the oceans around Florida, and the joint Russo-British naval defence of Greenland.
The former US territories around the world, such as Puerto Rico and the other Caribbean islands, and also the state of Hawaii, got independence and became major defence bases in the war against the gays.
The non-twink world is now largely supporting homosexuality but still fearing the twinks and defending the world from their forces.
The USG is planning a huge invasion of the non-twink world...