Sandy Beaches (An Avain! Keith and Siren! Lance Klance Fanfic)

(This is inspired by too many things I've lost track)
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All characters are owned by Voltron Legendary Defender, unless said otherwise. The story, concept, and plot were all made by me.
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Keith is an Avain that lives alone right next to the beach. He enjoys his time and is often visited by Shiro and Adam. Lance is a siren, but never really understood the power of his voice. The first time he ever sang above water, he crashed a ship full of people. Lance never intended for this to happen, and becomes so traumatized that he goes mute. One day a strong current flew him from his home, and he was knocked out. Keith finds Lance beached near his house and takes him inside, even though he knows Lance is a siren. I'm not gonna get too spoilerly though.