How do I ask this guy I want his baby?

I want a plantonic co parent relationship with this guy , I want to pass on his family genes. I know this may sound crazy but that’s what I want and I don’t know how to approach him with this without creeping him out or make him feel some type of way. I think it’s an honor to have his off springs lol
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I want his sperm
How do I ask this guy I want his baby?
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