Merman x male siren!

Although the songs of male sirens have no hypnotic qualities to them, Reif still couldn’t help but feel attracted to your mating song. Due to the ongoing feud between merfolk and sirens, however, he felt compelled to keep his attraction to himself. He listened to your songs in secret, leaving behind courting gifts as an indication of his interest. After a month of this, he had finally been caught.

Warning for eggpreg/mpreg

I recommend skimming through the character description, but it isn’t required.