When Mermen Run From Their Demons

Parts 1/4 are done. Part 2 is being written.

(ManxMan) Zac Triton is nobody's hero, especially after the events that led to his mother's death. When he's around, the sound of his voice alone can make you do things. Anything. Whatever he wants. You cannot trust him, or even yourself when he's around. But people forget that, and it doesn't help that he's also the Prince of The Merfolk.
The semester after he turns nineteen, he gets sent off to an elite university for supernatural creatures. While there, he gets acquainted with the infamous Trevor Brooks, universally and solidly hated by everyone and their moms. Why? Because he's the first demon in history to be allowed to leave their prison of Hell.
A series of sinister events lead Zac and Trevor to believe they're being haunted by some very pissed off demons, and if they don't figure out how to stop them, the consequences will be horrifying.
The main question is, just how messed up can Zac get before they break him? And is Trevor really falling in love, or just falling under his siren song?

WARNING
Content not suitable for those who are triggered by:
Gore, death, drug abuse, swearing (lots of it), suggestive scenes, sexual interactions between two men, implications of mental illness, and abuse.