Ookami wa Tsuki ni Koi wo Suru - Vol. 2 Ch. 12

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Up until the 20th century, cousin marriages were very common (most people lived in small farming communities, where ALL the eligible guys / girls were your cousins).

I forget where I read about it, but the risk of bad recessive genes coming up is not much higher, and it is counterbalanced by the fact that the couple will be more likely to share values (resulting in a stronger marriage).
To be specific, children of cousin couples are two times more likely to have birth defects, but this increase correspond to an increase in probability from 3% to 6% for an individual child to have birth defects. Roughly, from 1 in 33 in non-related couples to 1 in 17 in cousin couples.

The real risk comes from multiple generations of cousin marriages, because that decreases genetic diversity and makes cousins closer to siblings. That's at least 25% or 1 in 4 children with birth defects.

Also, multiple generations of cousin marriages causes inbreeding depression, which is a fancy way to say children are becoming prone to getting sick and quite literally losing IQ.
 
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Dex-chan lover
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So much happened in so little time, this author is genuinely just trying to check off trope boxes. Like I figured it was pretend dating, so when she revealed they were cousins I thought: "Oh, so it was never gonna be a thing anyway that's good." And then she had to ruin it 🙄
 

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