I wasn't actually sure how it worked and I have breeding for almost 3 years now lol. I always thought that the female would store sperm from a previous male, if there was no male present, she could still have his babies but if there was another male, she would have his.
I put all mines together so don't know if she had his fry or some other males, I only had 1 male in the tank, when the fry were born they were all black, then turned into the ones I posted. There were 2 females, I think I have kept the other female with the cobra tails fry.