>>12495924Every fertile female at once is basically impossible. But you can get close.
formulate some form of viral vector delivery system that invades its host asymptomatically, is delivered to the uterus, and invades eggs and injects sperm DNA into the eggs; make it ingestible, put it in major water reservoirs in some time release mechanism (e.g., a box that contains the lyophilized/stable vector). Once its released and begins working, it will be discovered, so you'd want to time it to go all at once, so spend some time putting these time-release boxes in major drinking water plants, then trigger them all at once.
Bam, how babby formed