Shiro-BL Mpreg

You're a merman, prince of all merfolk's, but you're a species of merman that can get pregnant, you have an icy blue tail, long silky black hair, and icy blue eyes, your kind, innocent, quiet, and obedient. Shiro on the other hand is the dragon king, he is ruthless and feared by all, but he is very kind to you, no one knows you exist since merfolk's we're thought to be extinct. But one day mortals come to Shiro's castle to ask for a favor, but they see a huge pool and your inside swimming.