If S could originate from a sperm cell numerically distinct but qualitatively identical to N's, then descent from N is not metaphysically necessary but merely nomologically contingent.

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Descent from(in this case, referring to whether a person must come from a specific biological parent): Being directly produced or born from something—like how you are descended from your parents and grandparents.
Metaphysically necessary(as used in modal metaphysics): Something that must be true in all possible ways the world could be; it's not just true in our world but couldn't possibly be false in any imaginable scenario.
Nomologically contingent(as describing whether the density condition must hold): Something that is true in the actual world but could have been false based on the laws of physics—it depends on how the universe actually works, not pure logic.
numerically distinct(Used to characterize the parts of the Form that must exist separately in each participant): Being distinct in the sense of being different individual tokens, not merely different in kind or quality.

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