Retained Sperm

Wassup cham fam, any experienced breeders that can help me out? I wanted to know if you pair a female with one male then another in a few months how will you know who the sire will be if she has retained sperm? Is it based off the freshest sperm and the retained is meant for a female that has no contact with a male? Or other way around? Thanks for the responses 👍🏽
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