Agree
A husband and his husband find a shellfish and agree to share it.
Picture the husbands pulling a different side of the shellfish, it pops in two, and they each get a shell. They smile and high five.
さん
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Since the husbands were able to agree, Santa-san (さん) believes they’re both good husbands and belong on the good list. Therefore, Santa-san gives them each lots and lots of shellfish for Christmas.
Imagine Santa-san flying over the husbands in his sleigh, raining shellfish down upon them from the sky. It warms the heart, wouldn’t you agree?