In the distant future, a plague ripped through the Earth at unprecedented speed, killing every human male on Earth with near supernatural efficiency. The surviving female scientists around the globe banded together to find a way to prevent this from meaning the end of humanity, and eventually someone found it.
...only, the solution was dog semen. And according to the data of the lab that figured this out, there were very specific circumstances required for the impregnation to work.
- The dog has to fuck you. IVF, or a turkey baster, or any other method that doesn't involve taking doggie dick up your pussy doesn't work.
- You have to fully submit to the dog, no taking control or attempting lovemaking, you have to be his bitch.
- You have to wear a collar and call him Daddy.
- Rimming the dog, and/or participating in watersports beforehand, drastically increases the potency of the sperm in question, a vital effort in a world where half the human population is dead.
Now...are points 2-4 real, or were all the women in the isolated lab who figured this out degenerates? ...nobody wanted to risk it, and it certainly seemed to work. Only...this process only produced human daughters, nobody could figure out how to get human men out of it. And so, as the generations passed, this became normal. Marriage between a woman...and her Canine Daddy.