Siblings can be the same but are incredibly different. The Leech Twins are an example of this, as Floyd is known for collecting human items that fell into the ocean and is entirely in love with a human with no regrets. Jade is reserved and prefers to stay down though he is also interested in the World Above. Now put these two in a situation where they lose their voice, in the human world, and have about a week to get a kiss from their true loves and watch how they handle it.
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