Because I suddenly read BL comic about mermaids, this story just crossed in my mind.
Once upon a time there was a mermaid prince who can conceive, once he saved a human guy and become friends, they're always together enough for them to fall love with each other.
Even though the prince know that mermaids was not allowed to fall love with humans.
One day the queen discovered her son's secret and she locked down the prince in their kingdom, she said "you're not allowed to go up in the land ever again!" While the human guy keep searching for the prince everyday ever since he's gone.
Another day. their love bloomed, the prince give birth to a beautiful baby girl, the baby don't have mermaid tail, so they have no choice to throw the baby up in the land, the prince was so sad he lost his love and now even their child he really wants to escape but he can't.
While the baby was accidently found by her real father and the human guy decided to adopt her, even though he don't know that she is his real daughter.
—I'll name the human guy Terrence, the mermaid prince is Aquario and their daughter is Aqua.
Terrence know that Aqua might have mermaid blood because she can understand fishes and talk to them, a natural skill of mermaids. While Aqua growing up with Terrence and Aquario stayed in the kingdom for 10 long years they're never give up on loving each other.
The poor prince was so sad and lonely he can't even smile his servant and childhood friend Thiano is so pitying his friend so he decided to help the prince escape from the kingdom.
And the plan is success.
Aquario really wants find his daughter and his beloved, but only if he had human legs and suddenly Thiano remember some creature who can help the prince to have human legs, it's The Sea Witch. The Sea Witch said "of course! I can help you my prince but it's gonna be just 12 hours at night it'll be back in mermaid tail, that's all I can do because the queen of mermaids can only give a mermaid a permanent human legs."
The prince said "that's fine! It's enough for me to search for my daughter and...my..... love..."
The Sea Witch give Aquario the potion.
Now Aquario had legs.
"Now, do you have any clue how to start finding your daughter? If she really still alive." Thiano said.
"She's alive! I'm sure I can feel her." Aquario replied.
"Is that how the mother feel their child? Can you recognize her when you see her too?" Thiano asked.
"Huh? I don't know I'm not sure. But maybe I can." Aquario answered.
"We need to find Sami first!" Aquario said.
"Sami? Your pet whale? You still don't know what happened to him yet?" Thiano just realized.
"What? Why? What happened to Sami?" Aquario asked.
"Sami's dead about 2 years ago, he's killed by bad human." Thiano answered.
"No... It can't be... Poor Sami..." Aquario said.
"Why don't you find Terrence first and then you two look for your daughter? After all she's his daughter too." Thiano suggested.
"No! How can I be able to face him when our daughter is still missing!?" Aquario yelled.
"It's fine, just calm down. You need to find them before the queen found us." Thiano said.
"Yeah, I know that..." Aquario calmed down.
"So I'll see you later tonight, good luck Prince Aquario." Thiano said.
"Aqua...? ..... Oh yeah! My Aquamarine pearl necklace!" Aquario remembered.Meanwhile Terrence and Aqua choose to live in near the shore.
"Father, do you have any idea where's my real parents?" Aqua asked.
"Sorry, I just found you on a abandoned ship with Sami." Terrence apologized.
"Oh, father I remember Sami said that my mother is a prince." Aqua said.
"Huh? Your mother is a prince? Prince not princess?" Terrence asked.
"Sami said it clearly. Father I wish Sami is still alive." Aqua missed Sami.
"I'm so sorry I didn't save Sami at that time." Terrence hugged Aqua.
"Father, I just wonder if my parents have the ability as me." Aqua thinking.
"Oh yeah, Aqua I want to give you this necklace. You wearing it when I found you." Terrence explained.
"Wow! It's beautiful. Father what's this stone called?" Aqua amazed and asked.
"It's Aquamarine pearl if I'm not wrong." Terrence said.
"Aquamarine? Is it how you get my name? Father?" Aqua curious.
"Actually your name is nothing to do with that stone. Because your name is from the only person I loved the most and the most beautiful person I've met." Terrence said.
"Geez, father I didn't know that you can be like that." Aqua said.
"Haha like that? What do you mean by that?" Terrence asked.
"Father can be fall in love but only once." Aqua said.
"I know it's might weird but I think you two looks alike. So I named you Aqua." Terrence said.
"So what's that person name? Father?" Aqua asked.
"It's Aquario." Terrence answered
"Aquario...? Wow! It's such a pretty name! Father I wish I could meet this person." Aqua said.
"I wish I could meet him again too." Terrence wished.
—"Thiano! Prince! I finally found you!" A voice coming louder.
"Huh?" Aquario and Thiano.
"A human?" Aquario asked.
"No, he's not." Thiano answered.
"Thian, you know him?" Aquario asked.
"That creature is the son of the sea witch. His name is Kin." Thiano answered.
"Thiano, Prince, I'm here to help you." Kin said while panting.
"The Sea Witch's son?" Aquario curious.
"Hey Prince, I came to help you. You don't have human money right?" Kin repeated and asked.
"Yes, but we have these." The Prince answered and pointed the bucket of jewelries.
"Ah right, mermens sure are rich... But it's dangerous to use them in human world, here some money you can use." Kin sighed and give a few pieces of paper money.
"I don't know why it's dangerous but thanks for the info Kin!" Aquario said.
"I'm going now."
"Wait!" Thiano and Kin said.
"Huh? What?" Aquario asked.
"Do you know where are you gonna start?" Thiano have a point so Aquario didn't answer.
"Hey Prince do you have anything that connected to your daughter?" Kin asked.
"I have my aquamarine stone here." Aquario answered.
"Okay, let me see." Kin said and he put a spell on it.
"Whoa! My stone is floating! Like under the water!" Aquario surprised.
"Just follow the stone but remember you need to come back here before sunset." Kin explain and reminder.
"We'll stay here and wait for you." Thiano continue.
"Thanks! Then I'll be going now." Aquario thanked before left."He's really gone... I'm still worried." Thiano said.
"I know, I know that's why I'm here you know? Here look at this." Kin said with a playful smile.
"Huh? A crystal ball?" Thiano curious so he looked at the crystal ball and see Aquario's current location.
"Thank you Kin." Thiano thanked.
"You are welcome..." Kin said with a little blush on his face."Hey Thian, why the queen need to throwaway her own grandchild, she can make her a mermaid right?" Kin asked.
"Do you think the queen can accept a grandchild who's a half-human and half-mermaid?" Thiano said.
"Oh, so now I understand. That poor child..." Kin said.But the sunset come and Aquario come back.
They're in the cave.
"Wow! Your tail is prettier than I expect." Kin said.
"Hey Kin why didn't change your form?" Aquario asked.
"Do you want to see my real form? I can chang—" Thiano stoped Kin from talking.
"No, we don't want. It's disgusting." Thiano said.
"Ouch! That's hurt my feeling a little. Thiano!" Kin said.
"Huh? What kind of creature are you? Kin?" Aquario asked.
"Disgusting creature..." Kin said.
"That's coming from you." Thiano said.
"Ahaha! That's what you said." Kin laugh at himself.
"Huh?" Aquario curious.
"I'm a half-squid half-human." Kin answer Aquario's curiosity.
"Half-squid half-human? ... You mean you have a tail like a squid?" Aquario confirming what he heard is right.
"Mn..." Kin nodded.
"Wow! That's kind of cool!" Aquario amazed.
"Huh? Aren't you think it's disgusting?" Kin shocked at Aquario's reaction.
"Of course not! I believe that every creatures in the world have their own beauty!" Aquario said while smiling.
"Hey Thian, you should apologize for calling him disgusting!" Aquario pointed Thiano.
"Prince, no need." Kin said.
"But Kin!" Aquario disagree with Kin.
"...... Ah, just go to sleep you need to get up earlier tomorrow." Thiano said.
"Okay. Let's go to sleep!" Kin just agreed with Thiano.And so Thiano go out in the cave..
"Why he acted like that? He's obviously avoiding apologizing to you." Aquario said with sigh.
"I told you no need to, it's fine hehe." Kin said.
"Okay, if you say so." Aquario said.
"Good night Prince." Kin said.
"Good night." Aquario answered(I wonder what kind of relationship Thiano and Kin had?) In Aquario's mind
Next day, Aqua's playing in the beach when extraordinary happening with her necklace.
"Huh?! What's happening? Father! Father!" Aqua calling Terrence in hurry.
"Huh? I'm here. Why are you in hurry?" Terrence asked.
"Father look! The stone in my necklace is glowing and floating in the air!" Aqua looks amazed while speaking.
"Huh?!" Terrence was shocked.To be continued
I think it's long enough for it. This is not my style of writing stories so I decided to write the next parts in my style.

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Aquario The Mermaid Prince (BL)
FanfictionOnce upon a time there was a mermaid prince who can conceive, once he saved a human guy and become friends, they're always together enough for them to fall love with each other. Even though the prince know that mermaids was not allowed to fall love...