The people were relaxing, enjoying their last few days of being at the beach. However, some people notice a dark shape in the water that continues to grow. All of sudden, the water bursts apart, forcing people to move away.

Giga was back in her true form, roaring angrily. She couldn't believe she was tricked! She couldn't believe she was giving her powers away to something she thought wanted to help her! Well, now she was going to give the Siren Queen a piece of her mind!

The Siren Queen was smirking. Sure, Gig took off the jewel she gave her, but she has already gotten enough power to match her. Giga tried to punch her, but the Siren Queen dodges. Giga threw another punch, but the Siren Queen dodges again.

Suddenly, the Siren Queen heads butts Giga, catching her off guard. The Mermaid Queen falls back, hitting the water. She cased large waves that hit the beach, almost dragging some people in. Some weren't so lucky and got caught up. However, before they could go too far in the water, the mermaids quickly swam around, grabbing the humans, and taking them away from the fight. Many people were shocked to see them, but there was no time for questions.

Danny ran down the beach, holding the sapphire in his hands. He soon found his family, safe from the fighting.

"Mom, Dad, Jazz, Tucker, Sam!" He shouted, making them turn.

"Danny?! Oh, thank goodness." Maddie said, glad to see her son was safe.

"Where were you son, these two sea monsters are going at it!" Jack said.

"They're not sea monsters! Nor are they ghosts! The Big Green is a Mermaid and the Big White one is a Siren!" Danny told them.

"What's the difference?" Jack asked, confused.

"Never mind that! We need to stop the fight!" Danny said before Claria jumps on the deck.

"With their sizes, they could destroy everything close to this beach! Human, you're the Queen's Mate! Can you stop her?" She asked.

"How! I was only her mate for a few days!" Danny asked.

"Mate?" Jack and Maddie asked, confused.

"Long story short, I save a mermaid queen when I was little, and we started dating after meeting up again," Danny said, confusing them more.

"I'll explain later!" He said, knowing this wasn't the time.

"How about that the giant mermaid is Gina!" Sam shouted.

"SAM! Enough! This isn't the time!" Danny said, not wanting to deal with her right now.

Danny turns to the fight, seeing that Giga was having some trouble fighting back. The Siren Queen kept calm as Giga was full of rage. If only there was a way to help her.

"Um, Danny? I know this isn't the best time to ask, but why are you holding Giga's jewel?" Tucker asked.

Danny looks down at the sapphire. He recalls that Giga use it to change her size and shape. But it also drained Giga's powers. Giga threw it off when she rushed at the Siren Queen. He didn't know why he pick it up. But his mind was starting to get some ideas.

"Human, please tell me you're not thinking of using that jewel," Claria asked, noticing the look.

"I have to stop them. Giga used this so we can be close." Danny said, confusing his parents even more.

"Danny, what are you talking about?" Maddie asked.

"There's no time. I really hope this works." Danny said, putting the sapphire on his shirt.

Danny closes his eyes and focuses. He could sense two powers, both of them coming from the Siren Queen and Giga. Danny could see that Giga's was far weaker than the Siren Queen's. Knowing he need to tip the odds in their favor, Danny tried to drain the power from the Siren Queen. He really had no idea what he was doing, but he had to try.

Danny could feel something enter him, feeling something trying to change him. Everyone watched as a glow appeared around Danny before he opened his eyes. They were glowing before he started to grow.

"Danny?" Sam asked, worried.

Danny was still growing before he took off down the dock.

"DANNY!" Maddie cried, surprised.

Claria watched as Danny's skin started to turn green and his legs started to fuse together. He jumped into the water just before a tail was seen.

'He turned himself into a merman?' She thought, surprised.


Giga was able to land a hit on the Siren Queen, only for her arms to be grabbed. The Siren Queen then headbutts her, completely dazing her. The Siren Queen then turns around, slamming her tail on Giga, knocking her out and down the water.

As Giga sinks, something came swimming toward her. Two green arms wrapped around her body and tail before holding her close. She groans as she opened her eyes.

"Giga?"

She looks up to see a merman looking back at her. And yet, he looks like Danny.

"Who?" She asked, still out of it.

"Giga, it's me. Danny." He said, causing her to look at him.

Giga blinks when she looked at the merman. Green skin, gills, a fishtail. She notices that his hair was black and in the same style as Danny's. He was wearing the sapphire wear on his chest before looking into his eyes. Giga blinks, reaching up to touch his face.

"Danny?" She asked, seeing him smile and nod.

"How?" She started.

"To be honest, I wasn't sure if it would have worked." He said, placing a hand on Giga's hand.

"Why?" She asked, confused.

"You and the Siren Queen are putting people in danger by fighting near the shoreline. Your people are working on saving them, but we need to take this fight away from it." He said.

Giga looks down. She was so angry, she forget that she was near the beach. Not only did she show her true self, but she also put people in danger.

"Giga, listen to me. I know you didn't mean it, but we need to move. I don't how long it will take for the Siren Queen to come down and check why you're not going up. We need the element of surprise here." Danny told her.

Giga nodded. She was able to swim before pulling Danny into a kiss. Danny blinks for a second before kissing back. They broke before Giga swam back up to the surface with Danny waiting for his move.

'I'm so glad that I learn how to use my merman form when I change!' Danny thought.


The Siren Queen frowns, wondering why Giga wasn't come up. Yes, she hit her hard with her tail, but it wasn't enough to kill her. She wanted to have more fun before she does. The Siren Queen got ready to dive before a green arm with a fist shot out and punch her under the chin. She was knocked back as Giga jumps out of the water and slammed into the Siren Queen, dragging them both underwater.

The two Queens wrestle, trying to stay on top of each other as they sank to the bottom. They hit the sand, causing it to rise up and surround them. Giga spotted a tailfin and knew that Danny was close by. She cause more sand to arise before the Siren Queen couldn't see her. The Siren Queen felt the Mermaid Queen back up, letting her get up.

However, she was shocked when something tackled her from behind. She was able to able to see who it was when a fist come from nowhere and punch her in the face. Danny let go of the Siren Queen before turning around and slapping her with his tail.

'I'm starting to see why mermaids have tails.' He thought.

The Siren Queen groans before getting up. She had no time to act when Giga plow into her, knocking her for a loop. She then felt something grab her face, slamming her into the sand. Danny and Giga quickly back off, keeping away as much as possible. So far, the plan was working. The Siren had no idea that Danny had taken some of her power and became a mermaid. But they knew it won't last forever.

The Siren Queen picks herself up, growling dangerously before seeing Danny in his merman form.

"WHAT? HOW?!" She shouted before seeing the Sapphire on his chest.

She quickly test her power and saw she was missing some of it.

"YOU! You took my power?!" She shouted.

"No, I took back the power that belongs to Giga," Danny said, ready to fight.

The Siren Queen growls before smirking. She stood up, looking at the couple.

'So you turned yourself into a giant mermaid? Now I'm wondering if you can use it to turn yourself into a male siren." She said before swimming up to them.

"LET'S FIND OUT!" She shouted, with a crazy look on her face.

Danny felt the Siren Queen grab the jewel and felt something trying to change him. Giga quickly slaps her away with her tail, growling.

"No one, and I mean no one, TOUCHES MY KING!" She shouted, tackling the Siren Queen.

Danny could feel himself gaining control again and shook his head. Being transformed into a mermaid was a little weird, but trying to be forced into changing again felt really uncomfortable. He notices that Giga was pushing the Siren Queen away and quickly follow after them.


Giga pushed the Siren Queen further from Danny until they entered a ship's graveyard. The Siren Queen was able to bring both hands down on Giga's back, knocking her off. Giga lay in the sand before she felt her hair get yanked up.

"Poor little queen, worked so hard to win the boy she loves, only for it to all fade away. Don't worry, I'll take good care of him." The Siren Queen said, smirking.

She was then slapped away by a tail as Danny checked on Giga.

"Are you okay?" He asked.

"I'm fine," Giga said, getting up.

The two saw the Siren Queen smirking before she held her arms out.

"You two are far more trouble than you're worth. I did everything I could to make you two fall in love. I even dealt with that girl that was trying to break you up." She said, causing Danny to glare.

"Hell, I even went as far as for you to tie the knot!" She added, causing Giga to growl.

"The only thing I didn't expect was for you two to mate. Still, it doesn't change anything. I'll rule the seven seas and the humans will be my slaves! And I will have the boy as my king!" The Siren Queen before she started growling.

Danny and Giga were shocked to see her turn colossus size before forcing the water apart, leaving them both on dry land. The Siren Queen reaches down and grabs Giga. The Mermaid Queen struggles as the Siren Queen laughs. She started to squeeze Giga, forcing her to cry out in pain. Danny had to do something! He quickly remember that he turned himself into a mermaid and could change back. Acting quickly, Danny was able to change back into his smaller human self. Wasting no time, Danny looked around before spotting a spear. It was worn from the sea, but it was still in good shape.

He knew he couldn't reach Giga from here, but that didn't mean he had to.

"Never thought I said this, but thank you for being my partner for the fitness test, Dash," Danny said, tieing the spear on his back.

Danny ran up to the Siren Queen before moving around and started to climb up the back of her leg. He knew this was going to take forever, but he had to try. However, his mind quickly thought of a better plan.

"Here goes nothing." He said, climbing on her foot.

Danny took the spear and stab it in the Siren Queen's foot. The Siren Queen blinks before looking down. She spotted Danny, who blew a raspberry at her.

Scoffing, she reaches down to grab him. Acting fast, Danny stab the spear into her palm when it was close enough. The Siren Queen flinch, forcing her hand away. Luckily, Danny held on to the spear as he was carried back up. The Siren Queen put her hand up and saw him.

'Foolish boy. You should have stayed as a merman. Now, I have to be far more careful about crushing you with my hugs." She said.

Danny notices a red jewel on her head and had a feeling that was her weak spot. However, he needs to do something else first.

"My parents will kill me if they find out about this," he said, starting to swing him back and forth.

Danny felt the spear come loose and started to fall. He quickly tied the rope to the spear and threw it as hard as he could. His arm was true and he hit one of the Siren Queen's fingers. He felt the pull before swinging him around. He saw the Siren Queen's hand for him and had to do something. He saw Giga's tail and let go of the rope. He reached out and grabs it, causing Giga to flinch.

Using her tail as another mood of swinging, and remembering to apologize to her later, Danny flung himself onto the Siren Queen's breast. He then signs, before slipping under the claws.

'My, my, such a prevent. You wanted to see them, you could have just asked." She said, pulling her coral off.

She was surprised to see that Danny wasn't there before holding her coral to her face. Danny jumps off the coral trying his hardest not to blush. He lands on the jewel before taking out another spear. With a shout, Danny slams the spear into the jewel causing it to crack.

"NO, YOU FOOL! I NEED THAT!" The Siren Queen shouted before the cracks grew and burst apart.

The Siren Queen screams as she threw Giga away from her, trying to stop her power from leaving. Giga spotted Danny below her, having been blown off before she was thrown. She turns around and puts herself into a dive to reach him. She was able to too and held him close to her. She landed in the water, causing a huge splash.

Giga quickly surfaces, holding a daze and wet Danny. Giga sighs, glad he was okay.

However, the Siren Queen was losing control of her powers. With her jewel to keep herself contained, her power started to leak out over her body, causing great pain all over her body. She started gaining cracks all over her body as she tried to hold on. Finally, it was too much, The Siren Queen screams in pain as she started to glow before exploding. Giga cover Danny with her body as a huge gust of wind come toward them. However, it was far strong them it look, ending up blowing them both away as the water clashed back into the spot.


Siren Queen Lair,

The creatures sitting by the lair felt the Siren Queen's power weaken and started to glow. Soon, mermaids and spirits of sea man came out of the lair, finally free of their curse.


With Danny and Giga,

Giga lay on the beach, groaning. She opened her eyes and looks around. She quickly knew this part of the beach. It was where she met Danny for the first time.

"Danny!" She shouted, quickly looking for her mate.

She found him not far from her. Right behind the rock when she was captured. She careful reach over, scooping him into her hands.

"Danny?" She asked, worried.

Danny didn't move. Giga started to get worried before she carefully place a finger on him and press his chest. Danny spat up the water he shallow before coughing. Giga sighs as she moves her finger away. Danny sat up and looked around.

"Where? Wait, is the beach where we first met?" He asked.

"Yes. And I can't believe you did that." Giga said, sighing.

"I know. I don't plan on doing that again, anytime soon." Danny said, sighing.

Giga smiles before bringing Danny up to her lips. She was about to kiss when two things happen. One, she just remember that she was back to her normal size. And two, she heard some people call out for Danny.

They two looked at each other, knowing there will be lots of explaining, but they decide to face it together.


10 years later,

24-year-old Danny sat with his new wife, Giga during a family outing for the summer. 10 years after stopping the Siren Queen, and working out a way to have humans and mermaids get used to each other, things have changed. Jack and Maddie were put off at first, but they soon ease into it, seeing how much Giga truly love their son, even if she was far bigger than him. Sam was bitter during the first few years before she started to see that she was wrong about everything. She accepted Danny and Giga's relationship and did everything she could to earn their forgiveness. Tucker, well, was Tucker. He was able to win a mermaid over after being told to just be himself. And Dash...well, let's just say he was left in the dust.

Danny sat in the chair, holding his half-human/half-mermaid daughter as Giga sat next to him in the sea. Danny tickles his young daughter, causing the baby to laugh.

"She already has her baby teeth," Danny said, causing Giga to smile.

"Younglings grow up differently than humans." She said.

"Still, I can't believe she was born human size," Danny said.

"When you're holding her. We mated so many times we forget about the sapphire that we use to change size." Giga said.

While the sapphire might have been given to her by the Siren Queen, Giga could bring herself to throw it away. They kept and use it many times. Danny turns and hands Giga her daughter. The baby grew until it was bigger enough to fit in her hands. Danny looks around, seeing that humans and mermaids were getting to know each other without trying to show off or hurt each other. They still have a long way to go before everyone accepts this, but it was a start.

"Danny?" Giga asked, making her husband turn.

"Yes, Giga?" He asked.

"I'm afraid it's that time again." She said, causing him to sigh.

"Human or mermaid?" He asked.

"We did human last year," Giga said.

"Alright, but later tonight, okay? Mom and Dad want to see their granddaughter, and Jazz is getting married later this week." Danny told her.

"I know. Just know that I love you." She said, leaning down to kiss him.

Danny kissed her, ending the tale of the Giga Mermaid.


AND DONE! Whew! The fight took a lot out of me to write. I'm sorry about the sudden time skip at the end there, folks. I wanted this story to be done, and I really didn't feel like writing anymore. But the Siren Queen is defeated, and life for both humans and Mermaids has changed. While still having some problems, things are going nicely.

And this first Monster Girl Story I have fully finished! One down, six more to go. Yes, Six. I still have to finish my Harpy, Snake, Centaur, and Spider Girls stories. There are also two more Monster Girls stories I have to write. I still got a lot of work ahead of me. Please know that I am thinking on doing more Monster Girls Stories in the future. But I'm trying to hold off on them until I get more of the main stories finished. Until then, This is Phantom Fan 21, sighing off on this story! Thanks for reading.