Requested by LouAkabane
Tysm for your request. I hope you enjoy the story...
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It was sunset. Shu Kurenai was walking along the beach thinking of how to help his student Lain. He was walking and walking until he spotted a girl near the shore.
He quickly made his way up to her. On taking a closer look at the girl, he saw she was all wet from head to toe and was panting. Shu had worry written all over his face.

"Hey, are you okay?" Shu asked.

The female opened her eyes slowly and looked up at him. She held one of his hands and pleaded him,

"Please help me hide somewhere."

Shu, without hesitation, picked her up on his back not caring that she's all wet trotted away from there and towards his hotel. He didn't care about the annoyed expressions that the girls in the hotel was giving him.

He just quickly made his way up to his room and locked the door as soon as he entered. He laid the girl down on his bed and brought her a towel. She smiled at him and used it to wipe her hair and face.

"You are safe here. Now mind telling me who you are?" Shu asked once the girl was comfortable.

"Thank you for your help. My name is (Y/N) (L/N). I'm the mermaid princess of the underwater kingdom of Mermadia."
She introduced herself.

Shu widened his eyes slightly and let out a chuckle as he said,

"Come on, don't mess with me. Mermaids don't exist."

The girl shook her head and said, "No, I am a real mermaid and I can show you."

Shu tilted his head and asked, "How?"

She grabbed his hand and took him to the bathroom and turned on the tap. Shu's face turned red as he asked, "Aren't I supposed to look away?"

"No need. It's completely safe." She replied.
When the tub was full she said, "Now watch."

And she sat in the tub (she has her clothes on, don't worry) and closed her eyes.

(Just imagine you look somewhat like this)

"See." She smiled as Shu's jaw dropped.

"I-i can't believe it." He said still in shock.

(Y/N) pulled her tail out of the water as he touched it.

"So why did you ask me to help you hide and if you are a mermaid princess what are you doing out of the water?" He asked.

(Y/N) frowned a little as she said,

"I'll tell you everything from the beginning. Just promise me that you won't tell anyone."

Shu gave her a warm smile and said, "I won't. I promise."

Then (Y/N) smiled and spread out her arms and asked him, "But first pull me out of the tub. Please?"

Shu's cheeks were dusted in red as he asked back, "B-but you need to be in water, right? And besides your tail is um...it's um....wet so uh...are you sure?"

"Yup! Trust me just give it a try." She exclaimed.

Shu gulped but hesitantly picked her up bridal style. He was surprised that her tail felt dry.

"I thought mermaids need to keep themselves in water or else they'll get dehydrated?" He asked her.

"Well not always. We can stay out of the water in this form for a good while too." (Y/N) replied as Shu set her down on the bed.

"So tell me the whole thing." Shu said as he took a seat in front of her.

"Okay. So, in my family, my parents think that humans are nothing but pure evil. It is because once my mom barely escaped from a fishnet set in ocean, because dad came to save her on time. Since then, everyone in the kingdom is terrified of humans and never leaves the kingdom's parameters."

"But I was different. I always dreamt of at least once getting the chance to come up to the surface and see the world of humans. So, one day I asked my fish friends to help me escape. They were reluctant but still agreed. And then, I sneaked out of the kingdom and swam all the way up. I was barely out on the sand, but two humans spotted me. They wanted to capture me but I managed to escape. And then I met you..."

Shu was listening very attentively to the princess' words. Then he asked,

"So, you want to go back home, right? I'll help you." He smiled warmly but it faded away as the girl shook her head.

"No, I don't just need to go back home but I'll also need to find a mate. I have to prove to my parents that humans are not evil. If I don't, my father will drown the entire planet out of anger."

"What?!" Shu widened his eyes with a look of both shock and horror in his eyes.

"I am not joking." The mermaid princess frowned.

"My dad is really overprotective of me and if he finds out that some humans tried to catch me. He's gonna burn down the city."

"Okay, so what do we do? How do we find you a mate?" Shu asked internally panicking.

"Hmm...how about you be my mate?" (Y/N) asked tilting her head innocently.

"Who? Me?" Shu asked pointing at himself surprised.

"Yes, you."

"Uhm...I don't know..."

"Why not?"

"I don't know anything about human girls at all. And here you are a mermaid princess. How are you making it sound so casual?"

"Because I kinda like you." She smiled.

"What? You like me?" Shu asked as he thought, 'Today sure is a day full of surprises for me...'

"Yeah. You saved me. If you wanted to, you could've easily given me away to those wicked humans, but you didn't. I'm grateful to you for that." She smiled.

"But...still...." Shu's voice trailed off.

"You really overthink too much." The princess pouted, making him giggle.

"Okay, okay....but do I have to do anything specific for that?" He asked.

"No, you don't have to. The princess has too." She said smirking, confusing Shu.

Then suddenly, without warning, she pushed Shu's back on the bed and kissed him. The crimson blader was left in surprise and shock. (Y/N) pulled away looking at his now red face, as she transformed back into her human form and got off of him.

Shu sat up, unable to say anything. So, (Y/N) decided to break the silence,

"So, did you like it? My mate~"

Shu placed a hand over his mouth, looked away and silently nodded. Then it hit him,

"Hey, don't you think your parents might be looking for you? We should hurry back before your dad does something terrible."

This made the female nod as Shu held her hand and ran out of the hotel.

The duo ran all the way to the beach, stopped and panted.

Then the water swirled around and out came a mermaid and a merman. The mermaid had a worried look and the merman was looking really angry. Shu was confused, but (Y/N) wasn't.

She quickly made her way up to the royal looking duo and gave them a hug as they hugged back. This made Shu widen his eyes in surprise.

"Hey mom, hey dad..." (Y/N) nervously smiled as she pulled away from the hug.

The queen smiled in relief as she said,

"Oh (Y/N), my baby, how I was worried about you..."

The king looked over to the boy standing there and asked her,

"Was this boy trying to catch you?! Let me teach him a lesson about what happens when someone touches a mermaid princess!"

He raised his hand to attack him but (Y/N) quickly stood in front of the Shu in a defensive position as she said,

"Dad! No, stop! He didn't do anything like that. Instead he helped me come back to the shore. Don't hurt him."

(Father's name) listen to her first, please..."
The queen also tried to calm down the king.

"Okay, I'm listening..." The king said after giving Shu a last glare which made him flinch a bit.

"Dad. His name is Shu Kurenai. And he is a very nice guy. He saved me from two wicked humans who were trying to capture me. He is the one who helped me get back here. And..."

(Y/N) paused as she held Shu's left arm tightly.

"And?" Her dad asked.

"He's also my mate!" She exclaimed with a bright smile.

"What?!" The king and the queen asked in surprise.

"(Y/N) is it true?"

The queen asked smiling happily as (Y/N) nodded excitedly. Shu was just standing there with a nervous smile on.

The three people looked at the king, waiting for his answer.

"(Y/N)." He called out to his daughter.

"Yes, dad?" She responded tilting her head to her side innocently.

The mermaid king sighed before he began,

"Since, you have chosen a human as your mate, I can't really change your mind. Also, you have my permission to stay on the land with your mate as long as you want to and return according to your wish. But do keep in mind, to stay away from bad humans and come to visit us from time to time, or else I won't hesitate to swallow the entire planet in the ocean. Got it?"

(Y/N) quickly nodded as she ran to gave her father a big and warm hug. As she turned to do the same with her mother, the king then turned his attention towards Shu.

"I don't really like humans but since my daughter not only likes you and loves you, you better take good care of her."

He extended his hand towards Shu, who shook it gladly as he said,

"I will, your majesty. I won't disappoint either you or her. I will always protect her. I love her, dearly too."

The king nodded as he and the queen moved away from Shu and (Y/N), saying goodbye.

"Goodbye my baby (Y/N). Make sure you come to visit us too." The queen said as her daughter nodded.

"And we would like to play with our grandchildren as well." The king winked as the queen giggled and they both went back in the ocean.

On the other hand, Shu and (Y/N) just stood on the shore with bright red faces. (Y/N) let go of Shu's arm and held her head down as she said,

"I'm sorry....about......my parents.....That was so...embarassing..."

Shu smiled reassuringly as he said,

"Don't worry about it." This made the princess smile.

"Shu?"

"Yeah?"

"Thank you for saving me today. I promise that I'll stay by your side forever."

And the mermaid girl quickly wrapped her arms around his neck and gave him a sweet and passionate kiss.

This time Shu was prepared, he too wrapped his arms around her waist and kissed her back. Pulling away, he said softly,

"I promise to be always there for you too. After all, I love you (Y/N)."

"Me too. I love you too Shu." She smiled, letting their foreheads touch.

And as always, it was a happy ending...

Shu's friends too came to know about (Y/N)'s mermaid secret but they promised to keep it a secret as well.
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Done! Sorry if I made y'all wait too long. And sorry if you didn't like it. 😞 But feel free to request again. 🙂
Anyways vote, comment, share and maybe.... follow me too? All the characters belong to Hiro Morita, only the story plot is mine.
Stay safe and have a nice day/noon/evening/night.
Sayonara, bug out.