Trying to remake a story I read years ago that does not exist anymore (Understandably so)

The idea behind the story was great. I cannot remember where I read it about 5-10 years ago. it was taken down I believe. The general concept of the story is the same though. I think the title of the original story was Sister's Karate Practice.

Kara was an only child. She was 18 and about to start college. She lived with her mother and older step brother Ron. He was 21. Her Stepfather James had passed away a few years ago so it was just the three of them.

They had lived a pretty sheltered life being home schooled. They played sports and did activities throughout their lives so they had some interaction with other kids growing up but still not nearly as much as the average kid.

Kara was only going to school an hour away and she was going to be living at home but it was the most independence she had every experienced. She was now a beautiful woman. She was 5'4 115lbs. dark brown hair with a great figure. Her mother was worried about her going to school and if she could fend for herself so when Kara came to her saying she wanted to start taking a martial arts class with her friend Tara from her soccer team her mother thought it would not be a bad idea. Her step brother Ron thought she was silly and made fun of her a bit. He would say things like "Oh no. I am so scared you might karate chop me." She would just roll her eyes and think what a dick. He needs a real humbling. He had always given her a hard time.

She had been taking the class for a few weeks now and really loved it. She did not realize how she would love it even a million times more after today. Today was the day that changed all of their lives forever. Kara was at class and her beautiful yet fierce martial arts instructor Sensei Melissa taught the class groin strikes. She was younger so she preferred the students call her by her first name. She was 5'6 130 lbs with some of the strongest legs you could imagine.

She started by demonstrating groin kicks. She demonstrated on one of the inflatable dummies. She explained the proper technique in detail and then demonstrated with a kick so hard ever guy in the class probably had nightmares. A girl next to Kara said "Oh my god. There is not a guy on the planet that would not be on the ground crying his eyes out after that kick." Kara thought that was odd. She heard the term kicked in the balls before but did not really understand the extent of it. She asked the girl "why is that so bad for a guy". The girl laughed and said "you are joking with me right". Her friend Tara said to the girl "No. She is homeschooled and has never seen a guy kicked in the nuts." The girl laughed hard and said "It is a guy's kryptonite. I could kick the toughest guy you know in the nuts and he would be down on the ground unable to get up. Probably crying." Kara said "No way. If she is teaching us it I am sure it is effective but I have fought with my step brother a bunch of times and I have never even come close to hurting him."

It was time for everyone to pair off and practice the kicks. The girl telling Kara and Tara got paired with a guy. She whispered "Here I will show you what I mean. Even with a cup it will hurt." The girls all practice their kicks at the instructor's request. They can see the fear in the guys eyes. They all fire pretty hard kicks. You hear some grunts throughout the dojo but nothing too bad. They go for kick 2 and the girl kicks the guy as hard as she can.

Only this time there is no sound of a cup and the feeling on her foot was much different. She expected to feel the hard plastic which hurt the top of her nicely pedicured foot and french tip toes. Unfortunately for him her last kick was so hard it knocked his cup out of place and up. He did not have a chance to adjust it before he saw her foot coming up between his legs. He saw the look of determination on her face and was petrified. It was worse than could have expected.

They felt it at the same time. The top of her foot struck his balls perfectly coming up under them and slamming them against his body like a sludgehammer. He froze for a second with a look of shock. Kara said "I guess it is not nearly as bad as you said for guys." The girl, Melissa, looked at her and said wait and counted down with her fingers 3,2,1. And a scream so loud it startled everyone in the dojo came from his mouth.

He was screaming "Oh my god. My balls. She crushed my balls. I think they're broken." He kept screaming over and over as tears started pouring out of his eyes. He falls over in the fetal position. Kara could not believe what she saw. She had no idea this could even happen. She did not know what to think.

Sensei Collins came rushing over and said "Oh no. How bad? Let me check to see if there is any real damage." Melissa said "I could feel them against the top of my toes. They didn't burst. He is just being a little crybaby. Oh no. She kicked my babymakers too hard. Wah Wah Wah." in a very mocking and condescending way. Every guy in there thought "what a bitch." but none of them had the balls to say it to her of course.

Kara was starting to have a strange feeling she had never experienced. It was one of excitement, arousal, and superiority. The first thought that came to her mind. Today was eye opening. I will never let a guy disrespect me. Then it really dawned on her. I hope for Ron's sake he does not try to pick on her again. She knew it was a matter of time. Probably sooner rather than later and he had no idea how different this time would be. She was going to stay after and ask the teacher the proper techniques of how to kick a guy in the nuts. She was afraid if she did not do it right she might make him angry and get herself hurt. If only she could see the future and know it was no her that would extremely hurt

Next part is when the good part comes. This is already far too long