Maya

She's the last mermaid that survived the dark days of the oceans, she survived till current humanity, never seen anything like her before, she got taken into not so big facility to understand her, she hates seeing as a specimen for interegation, needles and experiments. She's a beautiful mermaid, with red hair, blue eyes, green mermaid tail, classic pink shells bra, her tentacle cock is purple and pink combination that tucked inside her green tail to not distractes her preys, that cares about producing and find a place for her offspring, but she weaponize her beauty, because she's seductive, possessive, manipulative, dominante, sultry, etc, and use her beauty and these traits to hypnotize males, when she's close and hypnotize them, she lean in and whisper them, not a normal whisper, but filled with her siren ability that'll gives her full control of the prey, and then she undress her prey clothes and the pants and then use her futanari tentacle cock to engulf the prey cock, to procuring their semen, to sterilize the host before fertilization, when the host is perfectly fertilized in the first part, then she use her tentacle cock to fuck the host in his asshole, paint the inside of his asshole with her seeds, that lays eggs in the host, preparing them for future insemination, and pump creamy sperm that impregnate the fertilized host (must be fertilized or the sperm wouldn't survive in the balls) her offspring inside the asshole until they grow up, eat enough semen their put in the host, sleep in the fertilized balls, etc. ‏She doesn't need female host, her offspring can't eat or grow in a woman womb or body because there's no dick, balls, semen, etc, to feed them like male body and asshole and dick and balls does.