Disclaimer: Demon Slayer: Kimetsu no Yaiba and all its scenes, characters, etc. based on it, including the soundtrack, etc. belong to their respective owners (Koyoharu Gotouge, etc.). Cover image by ichiyuki_hk on Twitter. I'm merely writing this to entertain and I don't get any profit out of this.
Note: I wrote this for the event Zennezu's Valentine's Day on Tumblr. I wish it was better, but I truly wanted to write something about this cute couple before the end of February and this is all I could do with the university being hard. It's cliché but sweet so I hope you can enjoy it nonetheless.
When Nezuko woke up, the first thing she saw was a flower. It was tiny but really pretty, a beautiful shade of pink. It was entangled with her hair. She reached out to touch it. Where did it come from? Nezuko rose up and soon realized her hair was covered with flowers of many different types and colours. She touched her head and noticed what seemed to be a crown of flowers there. The bed was covered in flowers and flower petals too. Nezuko looked at them, amazed. She noticed the yellow dandelions. How…?
"Good morning, Nezuko-chan! Did you sleep well, sweetheart?"
"G-good morning, Zenitsu-san. Yes, I did… But… What happened here?"
"I got up early this morning and went to pick up some flowers for you. Happy Valentine's day!"
"Happy Valentine's day! But s-some? There must be hundreds of flowers here!"
"You deserve all the flowers in the world, Nezuko-chan!"
"Ze-zenitsu-san…" She was blushing bright pink. "You didn't have to…"
"Oh, but I had to. My gorgeous girlfriend deserves the best!"
"Thank you, Zenitsu-san" there were tears in her eyes. "Thank you so much. This is the most beautiful thing that anyone has ever done for me."
"I'm glad to hear that! Prepare yourself because I'll do my best to make you feel like a queen today and every day!" Zenitsu reached out to her embrace her and Nezuko let his arms envelop her, burying her head on his chest.
"I'll do my best to make you happy too, Zenitsu-san! But… I'm so sorry I can't give you a gift like this!"
"Well, there's one thing you could give me and that would be the perfect gift…".
She looked at him. "What is it?"
"A… Uh… A kiss…" Zenitsu's face was red but his eyes were determined.
Nezuko blushed but she wanted to give Zenitsu her first Valentine's gift and that sounded perfect. So she looked at his lips and leaned in, closing her eyes, until her lips touched his. He looked at her wide-eyed, almost unable to believe it, but he recovered quickly and closed his too to enjoy the wonderful feeling of Nezuko's lips against his. It was indescribable.
When they finally separated, they both looked a little flustered but overjoyed.
"Happy Valentine's day, Zenitsu-san," Nezuko said shyly.
For the first time, Zenitsu could only whisper. "I love you, Nezuko-chan." He was tearing up.
Nezuko smiled and caressed his face, looking at him lovingly. "I love you too, Zenitsu-san."
She kissed him again and they embraced tightly, ready to spend a wonderful Valentine's day together.