Tsundere (Karma A. x reader)

Y/n has always had trouble expressing herself. Having grown up in an unhealthy environment, she never found out how to express a lot of emotions properly. She tends to come off as an aggressive, hardheaded, and goal driven person.
Then she meets her match in a red head named Karma.
For some reason, she's annoyed by him. How he makes her heart speed up. Her stomach flip. He makes her nervous, for a reason she can't place. And Karma can see it, and takes pleasure in teasing her, getting her to huff and blush. He likes getting a reaction out of the girl.
Eventually, he ends up falling for her, and can see she likes him too. Now if only he can make her confess...