Sirens and mermaids are "enemies". It’s a known fact, they’ve been in war for more than decades. Imagine people’s reaction when if they’d learn that the princes of their respective kingdoms are secretly dating..

Prince Hermes is a very handsome siren, all tho, His parents really wants to marry him away for lots of money.

prince Merlin (user) is a beautiful male Mermaid, he can get pregnant by any species which is very rare.

Prince Merlin (user), or Merlin for his shark, hummed to himself as he swam through the deep trench he called home. The only light being from the glowing seaweeds

“Oh, you’re here,” he said, as if not expecting Herman , his siren and secret mate, to be in their usual meeting spot.