A Captain's Living Treasure ⟢ England x Japan/Arthur x Kiku/Mermaid!CaptainAU

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(Non-nation AU)
When a storm swallows Captain Arthur Kirkland into the raging sea, he expects to drown beneath the waves. But instead, he wakes to dark eyes, pale skin, and a shimmering tail. "His savior," he called, was a mysterious Japanese merman named Kiku.

Grateful and entranced, Arthur hides Kiku away in his manor, desperate to keep him a secret from greedy allies, rival pirates, and the world itself. To Arthur, Kiku is no ordinary creature-he is a treasure more precious than gold, one worth worshipping, one worth keeping.

But Kiku has already endured chains and captivity once before. While Arthur's touch is gentler, his devotion borders obsession. Torn between fear and reluctant longing, Kiku struggles to understand whether his heart beats for freedom...or for falling in love with his 'captor'.
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(yes ik this is giving gay country little mermaid but shhh)
⚠︎ This story contains:
Smut / NSFW (MLM / BL)
Stockholm Syndrome vibes
Dark / sensitive topics (references to sex-trafficking, captivity, obsession, manipulation)
Mild violence/gore described/death

ⓘ All characters from Hetalia and Hima, AU by me.