Miss Insane you never change... (Yumeko Jabami x fem reader)

You

Y/N/N = Your nickname

Flashback

Narrator PoV
"Weee!" A five year old Y/N screamed as she swung high on the swing. The wind in her face and the pretty sky towering over her. Being an adrenaline junky from the get go she leapt off the seat of the swing whilst at a dangerous height. Luckily landing on her feet she walked away from the apparatus when she was stopped by a girl who looked to be about her age. A weird haircut, brown eyes and raven black hair. The girl marvelled at Y/N before speaking. "I saw you jump off of that! That was amazing! That could've been really bad!"
Y/N: Uh thanks...who are you?
???: Oh sorry! My name is Yumeko Jabami!
Y/N: My name is Y/N L/N. Nice to meet you jabami-san.
Yumeko: You too L/N-san! Wanna play snap?

End flashback

And that's when it started. Not only yours and Yumeko's friendship but both of your gambling addictions. From Snap at 5 years old to match the match at 7 (double consentration) to blackjack at 10 and so on. The stakes started at ¥1 to gradually getting higher as time went on.  You and Yumeko were inseparable. There wasn't a day when you wouldn't hang out with her. That was...until her sister fell terribly ill.

Your PoV
We were only 12 at the time. Not completely being able to process everything at once. Yumeko went to visit her sister everyday. Leaving me to find a way to entertain myself. I went online and gambled. I gambled and gambled and gambled. I won a lot of the time with various cheat methods. Yumeko never knew I did this. I did not dare tell her. Not long after her sister fell ill though. Yumeko had to move away. We tried to keep in touch but with our paths on different journeys we parted ways and grew distant. I started working at my father's tech companies. We were one of the richest people in the world with my mum being the ceo of a popular and international gym. My sisters and I were set for the future. Being more comfortable with it, I told my family about my gambling addiction to which they sent me here.

Hyakkou private academy. A school full of rich kids throwing money at each other and competing for it. Aka: gambling. It was my kind of school from the beginning so I transferred here in a heartbeat. Within a day of me being there rumours reached my ears straight away. "Have you heard about the compulsive gambler?"
Y/N: Who? 
"The girl who gets off at risk taking!"
"Yeah she's scary!"
Y/N: wait what the hell?! Who is this woman?
???: ooooh another rumour! who's is it about!? I'd love to gamble them!
I slowly turn my head. The same weird haircut, Piercing brown eyes and raven black hair.
Y/N: Yumeko?
Yumeko: Y/N?
Ryouta: You know her Yumeko?
Ignoring the strange boy's words, Yumeko immediately jumped into my arms.
Yumeko: Oh my gosh! How are you here? I've missed you so much!
Well. The clingy persona hasn't gone but...man her breasts really suffocate. Puberty hit her like a truck.
Y/N: I-I've missed you too Y-Yumeko but...
I blushed and she got the message.
Yumeko: Oh you cutie! You certainly haven't changed Y/N/N.
Y/N: First, never call me Y/N/N again. Second, I'm not cute! Third, You haven't changed either miss insane.
She giggles.

And that's when we started again...