My Pretty Tiger Boy Atsushi x OC/reader

Fortune is Unpredictable and Mutable

Momoko sighed as she looked around the attic of the home she grew up in. Junk was piled up in nearly every corner, making her feel a tad bit overwhelmed. "It's not gonna clean itself...may as well just get it over with." She groaned and began cleaning. 

Within a few hours, Momoko had managed to finish the majority of the attic. "Just a few more boxes left." She picked up one of the said boxes only for the bottom to give out, its contents clattering to the floor.

"God. Fucking. Damnit!" she growled and knelt to pick up the junk but froze at the sight of a sealed letter with her name on it from her late father. Momoko gingerly picked up the letter and opened it. 

"Dear Momoko,

I hope this letter finds you well and brings you the comfort you deserve. As I pen down these words, I am aware that the path you walk is not an easy one, but I believe in your strength and resilience.

Firstly, let me express how proud I am of the person you have become. Your courage and determination have always shone brightly, even in the darkest of times. I have full faith that you will continue to carry these virtues forward as you embark on the journey that awaits you.

There is something of great importance that I must share with you, my dear. It concerns your grandfather, _________.

In the shadows, where alliances and loyalties are tested, your grandfather found his place within the Port Mafia.

I write to you with a heartfelt request, my beloved daughter. Seek out your grandfather, not with the intent of judgment, but with a desire to understand the complexities that have shaped his choices. Uncover the layers of his narrative, for in doing so, you may find answers that illuminate the shadows of our family history.

I trust in your ability to discern right from wrong and to navigate the treacherous waters with a discerning eye. Remember that you are not alone in this pursuit. You carry the strength of our family, and I believe that your journey will be a catalyst for healing and understanding.

May your heart guide you, Momoko, and may the truth you uncover be a balm for the wounds of the past.

With all my love,

Dad."

Momoko's throat tightened as she swallowed back tears. She missed her father terribly and even though it had been two years since his passing she would still find herself shedding the occasional tears. 

The sudden ringing of her cell phone caused her to jump as she was yanked from her depressing thoughts. 

She picked up her phone and groaned as she looked at the name of the person calling her. "You know it's my day off today, don't you, Kunikida?" She asked as she turned her gaze outside "Besides it's late, anyway." 

"Blame Dazai when you see him tomorrow. I already called Yosano, Ranpo, and Kenji but we could still use your help just in case things get out of hand."

She reluctantly agreed and got dressed before heading to the location given to her.

Upon meeting up with her coworkers the sound of fighting echoed from inside the warehouse. "So what was so important that you needed all of us here?" She bellyached. "In case you forgot, Kunikida...I have to vacate my home in the next two days..." 

Kunikida, being used to Momoko's complaints, simply ignored the teen and ran inside the warehouse. 

"There you are, Dazai!" He said loudly as he ran up to the trenchcoat-wearing brunette. 

After a moment Momoko followed her coworkers inside where they saw a boy about her age fast asleep on the ground with his butt in the air. 

Momoko couldn't help but giggle at the sight.

"Please don't tell me there are no casualties. Talk about boring..." Yosano whined as Kenji crouched down beside the sleeping boy and petted him.

"You've gotten better at solving cases, Dazai, but my logical skills will solve the big ones." 

"You owe me a meal after this, Dazai...I had to stop cleaning out my house for this." Momoko grumbled as her stomach growled. 

"What's your plan now, Dazai?" Kunikida asked and looked in his notebook. "He's been designated a security threat."

"Wait wait wait...this little cutie pie is a security threat?" Momoko chimed in as she crouched beside Kenji and ruffled the boy's hair. "I don't buy it."

Dazai chuckled and looked at the boy for a moment before smiling. "We're going to make him one of us."

"I'm cool with that. It'll be nice to have someone my age around the place." Momoko said flippantly while her other coworkers aside from Kenji protested the idea.

"Up, Atsushi!" 

The boy, known as Atsushi, opened his purple and yellow eyes to see a group of people around him. "Hello...? Who are you?" He asked, his gaze moving between Momoko and Kenji. 

"Atsushi! Do you remember anything from when you were transformed?" Dazai inquired, earning a confused look from the tiger boy. "Oh, look at that. Your right hand didn't change back." 

"My right hand?" Atsushi looked down at the aforementioned hand or paw in this case and moved it like he was making a fist. He began to freak out and wave his arm around while shouting to get it off.

"Atsushi Nakajima!" Atsushi stopped as Dazai shouted his name. "From this day forward, you're going to be one of us. You're the newest member...of the Armed Detective Agency!" 

'I'm what?' Atsushi asked himself as he scowled at the eccentric group before him.

-------------------------

I wanna see if y'all can guess who Momoko's grandfather is before I reveal it!

I will try and draw a better pic of her some other time but this is Momoko. 

A quick Bio:

Momoko is the same age as Atsushi and is an Aries while Atsushi is a Taurus. She has no sense of shame and is very comfortable with her body. She has various piercings as well as an underboob tattoo that a friend gave her. Momoko also likes to smoke and vape.

Her ability is called Sound of Spring or Haru No Oto. It allows her to manipulate nearby vegetation and even grow her own plants to manipulate. She can make flower petals into razor blades or even turn vines into a shield or use them to subdue enemies.