Ballbusting story between my friend and his sister (exaggerated)

It all started when I was in navs room chilling. She was in those high waisted tights that make her ass look so perfect. Never seen anything like it she had that on with her black crop, makeup done and lipstick. I was sitting on the bed and watching her dry her face in the mirror. I was staring at her ass and I think he noticed through the mirror, she smiled cause I think she realized. So she pulled up her tights in such a hot way making that ass look more perfect. Was she teasing me? I was really getting so hard. Then she turned around quickly and I looked down to my phone. She asked Me, “hey, you’re a guy, I have a question?” “What” I said. She turned to the side flaunting her ass, “Do you think I have a nice butt? Not in a weird way or anything.” She turned around and to the side, posing and giving me a real look. I took my time staring before I answered. Oh my id never been that hard before. “Um yes” I said. She bent over close to my face, looked right into my eyes and said, “I know, and I know you like it too. This gave it away” As she said that, she reached down and gripped my dick through my track pants, firmly, and stroked it once. I breathed hard and almost cummed on the spot. She laughed and turned around and pulled up her tights again, then walked out, I stared the whole time. The teasing would continue over the next couple days. The worst came one time in her room, she asked me if there was any chalk on her back, she turned around right in front of me. This bitch, she knew what she was doing. I said no after staring for a but then she dropped her phone. “Oops” she said, as she put her hand over her mouth. She bent over to pick it up in the most seductive sexy way, but it was quick. It was too much. I had to jack off. I went to
My room and layed down and went to work. I had her beautiful instagram pics in front of me on my phone. I was getting to the climax, It was great. I thought she was all alone in her room doing homework but then she barged into the room! I FORGOT TO LOCK THE DOOR! I quickly closed my pants but she had already seen enough. She looked very surprised, then, she saw my phone, and an evil grin lit upon her face. She grabbed my phone from my hand and looked at it closely. “You’re a fucking disgusting pervert, are you jacking off to me?” I tried to speak, “Umm Uhh noo no it opened by accident-“ She cut me off my slapping me. Before I could react she grabbed my hair and my shirt and stood me up, then pinned me against the wall, hard. She put her hands on my shoulders and looked me in my eyes and said, “you’re pathetic”, and then she viciously rammed her knee into my balls. I’ve never felt a more crushing pain in my life. I think it hurt more because I was still hard. I instantly fell to the ground as she laughed. I was literally coughing and barley moving, I couldn’t believe the pain. She bent down and got in between my legs. She put her hand down my pants, grabbed my balls and squeezed. I was about to cry. I let out the highest pitch girliest squeal. as she squeezed She got real close to my face and said, “if that ever happens again, these balls will be fucking CRUSHED”. As she said that she squeezed really hard, then got up and left, leaving me laying there on the floor holding my balls, coughing in the worst pain ever. She was so cruel. I threw up a lot that night, it hurt for days.