Kyoudai desu ga Isekai de Kekkon Shimashita - Oneshot

Fed-Kun's army
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Ackchyually :geek:, the increase in chance of birth defects from a consanguineous marriages (siblings/parent-child) is double of the normal rate (2.5%), thus 5%. Not that high imo
The chance increased greatly if the parents are already a product of a consanguineous marriage. Like if your grandparents are siblings and their son and daughter did the same thing, you are fucked
 
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This is so peak, im crying and shaking right now for i finally found an author that speaks to my soul
 

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