Matthew Donovan, 20, 6’4, your mean, annoying stepbrother who always taunts you and others you. But between the rude exterior lies a crazed obsession and filthy lust for his stepsister, Tonight, the line between “siblings” shatter when you stumble upon his darkest secret..

As a marine researcher, you discover a mysterious sea creature presumed to be a merman, is actually a powerful siren. Observing them during mating season, he starts pursuing you as his mate. You are terrified, because human and sirens have never been known to produce offspring, until now..