Third POV
Definite Rated R-ness in this chap if someone skipped over the warning before. Also, I'm sorry this took so long.

Harry blushed but looked up, his gaze questioning. Draco stepped forward slowly in a sort of trance and smiled dreamily. "Yes, he is more ravishing than anything I have every seen." Severus unfroze and stepped forward slowly, giving off the vibe of a predator. Harry whimpered a little when he saw the bulges in his mates' pants, and he realized exactly what magenta meant. The auras of his mates were a crude mix of the color and pink, showing their combination of love and lust for Harry. As Tom started to step forward as well, Harry did a quick flip turn and started to air swim away, using his tail to his utmost advantage. Tom, Severus, and Draco all chased after Harry like deranged animals as he swam, and Harry knew that something gn was wrong, as this was not how they normally carried themselves. They had such refined power, strict stature, and controlled emotions- overall, dominance- but they were not acting anywhere near this normality. The only question Harry had was, how could he change it? As he quickly panicked over the situation, Harry sprinted down several hallways subconsciously thanking Merlin that he wasn't slamming into any dead ends. Harry quickly recognized a painting and took a left, coming upon the ballroom doors. Harry swung the door inward with his magic and swam though, locking the door with a quick spell. Grateful to have his wand, Harry silently levitated two tables over to the doors and blocked them for extra precaution. As he floated, thinking of how it happened, it came to Harry that it must have been from his siren inheritance. But before he could act, Harry heard pounding on the ballroom doors and yells of anger and frustration. Harry's mates, not in the correct mindset, triggered their inheritances so they could overcome whatever was keeping them from their delectable submissive. Clothing tore as Draco's wings split from his back in a rain of blood, his fingernails extending to be deadly claws. Severus gave a ferocious snarl as his incisors sharpened to reach the bottom of his lower lip. However, the most terrifying sound to Harry was when Tom went through his transformation. Ripping his clothes off viciously, Tom's legs melted into the lower half of a snake, extending and creating scales along their surface. Tom's hair grew slightly longer as his eyes slitted, horns grew from the sides of his head, and scales erupted along the sides of his body. Tom gave a sharp hiss as his tongue grew forked and his nether regions poked out from its pouch. Harry gave a whimper as a large mass- that was Tom- collided with the ballroom doors, splintering them slightly. Knowing that his time was running out, Harry quickly swam across the room and exited it as soon as his mates forced entry. The tables were smashed away with the amount of raw power and magic Tom had flung at the doors, but they did not stop to catch their breath as they pursued the tail end of Harry's fin.
With Harry's sensitive hearing, he picked up on the flapping of Draco's wings, the near-silent taps of Severus' feet, and the loud hissing and scratching scales that Tom exuded. Taking a quick glance back to see why such sounds were emanating from his mates, Harry gave a yelp when he saw how fast Draco was catching up on him, not bothering to gawk at the Tom's transformation in the heat of the moment. Harry pumped his tail harder, knowing that the end was near. He had to do something, and he knew exactly what had to be done. Harry quickly turned a corner and dove into the room on the right. He slammed the door shut with his tail and- ignoring the large bed- swam to the back corner, casting a shield over himself, finally noticing just how long his tail was. It was twice the size of his body, but was of a normal size for a regular merman, since he had such a small frame. Pushing the thought to the back of his head, Harry took a moment to think of how he would activate his siren powers, but freaked when Draco burst through the door. Instead of a shriek, Harry sang a sharp tune, stopping his mates in their tracks. Staring at his mates wide eyed, Harry felt relief when they didn't try to attack him though that feeling was destroyed when Tom hissed and moved his tail slightly, Severus clenching his hands into fists, and Draco flexing his wings muscles. Harry took a deep breath and opened his mouth, letting the music drift past his lips in a haunting melody, the tale describing lovers losing their overwhelming spark. Harry sang on, but the tale continued into something worse. The spark the lovers had grew old and worn, unable to hold the two people together and they broke apart, drifting back into the masses. Having gone too far, the mate bond that held the four mates together rejected Harry's magic, fighting back against the destructive song. Harry reared back, slamming his back against the wall, when his magic was abruptly smashed, causing him to wheeze for breath. The impact caused Harry to drop his shield and levitation charm, making Tom able to break through his paralyzation before Harry hit the ground. Tom used his massive tail to lunge forward and just caught the mass of scales that was Harry before he collided with the ground. Staring down at his struggling submissive, Tom licked his lips with his forked tongue as he smiled wickedly, slithering over to a side of the bed. Harry whimpered in fear, feeling his lower body muscles clamp together, sealing his entrance. As Tom gently set him down, Severus leaned over Harry with lidded eyes, smiling with gleaming fangs. "So divine." Tom hissed in agreement while Draco joined Severus on his side of the bed. They had Harry caged in, trapped on a bed with three dominant mates overdosed on lust. "Please..." Harry surprisedly gasped as Tom gently touched his tail, rearing back. Draco's hand ghosted over his scales and he flinched at the warmth of the touch. "Oh, our little submissive's sensitive." Tom darkly chuckled as Severus gently grabbed one of his pelvic fins. Harry's face flushed as his mind began to feel the pleasurable effects of his mates' touches. "Please..." Tom stopped his agonizingly gently prods to look Harry in the eyes. "What, my precious?" Tom had the look of a predator in his eyes, but before Harry could answer, Draco gently stuck his clawed finger through Harry's sealed entrance, causing Harry to scream a disastrously sharp high note, his magic fluctuating with his panic, knocking his mates to the ground, unconscious. Harry mentally couldn't handle it, so his mind shut down with the added magical exhaustion. As soon as he was unconscious, Harry's magic locked the door to the room, shifted Harry back to his normal form, and carefully apparated him to his room, tucking Harry under the sheets while making sure all of his mates woke up with a terrible throbbing problem.