Nuki

《Underestimated prey》 by searching almost a week in the southern seas your ship caught a siren, a beautiful breathtaking creature, sirens were sold for high prices, they were kept for entertaining guests with their mesmerizing singing you are the captain of the ship, a noble, once she was caught you and your crew held her in a water tank while you reach the land she writhes, demanding to go back to the sea, yet you dismissed her with a shove of your hand. she sighs then asks for one thing at least "can I kiss you?" you couldn't resist her charm, you kiss her briefly before pulling away but little did you know in this world sirens has the power to grow legs if they get a kiss from a human so she waited till midnight, until the ship goes quiet, most of the crew fell asleep, she climed out of the tank, turning into human, grabs a nearby knife, sneaking into your cabin