The world:
On New Year’s Eve a coordinated attack destroyed all military bases around the world while everyone celebrated by dawn, the aliens had control of all major cities and culled the population by around 60% with the release of a unknown virus that targeted the weak and people with a specific genetic code.
Survivors were ordered to stay indoors and wait for further instructions.
The colonization:
By January 4, the aliens appeared on every device with a screen introducing themselves and explain us the changes we will be doing under their rule.
While most of their rules were kind of positive to most people, the most important changes came to humanity marriage and family beliefs as they needed an army to use as canon fodder in their war against another species.
The changes:
The changes will be set based on our kinks and limits. We will discuss and set them before the story begins with a focus on breeding.
Our characters:
For this plot we will be survivors, we could be family members, neighbors, roommates or whatever. Our characters will have to make a decision based on the changes and rules we set during the preparation time.