My Sister Annie Caught Me Again!

My balls ache, they're so sore that it hurts to move. It even hurts to sit. My sister Annie caught me spying on her when she was changing clothes yesterday, and she kicked me in the nuts. She absolutely nailed them. So today, I'm just hoping they get better. I'm trying to take it easy, and I'm trying not to piss off Annie again.

The truth is, it was worth it. Annie was trying on different tank tops, and I happened to walk by her open bedroom door. I have never seen anything so sexy. She was topless and dancing around her room. Her tits were swinging, and she looked amazing. It was great. Unfortunately for me, that's when she caught me watching her with my hand in my pants, and she kicked my balls so hard that I nearly passed out.

I can't stop thinking about Annie, about how great her tits are and how sexy she looked. Every time I think of her, I get a hard on, and it's making me crazy. I also can't stop thinking about her kicking me in the balls. It hurt like hell, but it also made me really horny. After I recovered, I jerked myself off and had an incredible orgasm. I'm definitely dazed and confused.

Annie and I both get up long after our parents leave for their jobs. We had breakfast somewhere around ten in the morning. Annie wore one of her new tank tops. It was thin white cotton, and I could see right through it. I kept staring at her out of the corner of my eye all through breakfast. After what happened yesterday, I was surprised she would wear something so sexy in front of me, but I'll never understand women. She kept leaning forward and giving me peeks down her top. I would swear that she was flirting with me. I was getting pretty excited. I felt like something was going to happen between us today, though I had no idea what it might be.

Annie announced she was going to go up and take a shower, I cleaned up our dishes and farted around in the kitchen, then I headed back to my bedroom. As I passed by the bathroom where Annie was showering, the bathroom door was open at least a foot. It seemed like she was tempting me to look, but I just moved on. My balls couldn't take anymore trouble. I went into my room and checked my email, but I couldn't get that open door out of my head. Was she trying to get me to peep? Did she want it? Did I want it? My cock started getting harder just thinking about her breasts again.

Finally, I couldn't stand it anymore, so I got up and walked over to the bathroom. I peeked in just as Annie got out of the shower, her naked body glistening in the light with water still on it. She reached for a towel and started to dry off. I knew I should run, but I felt like she was putting on a show for me. I had to watch. It was spectacular too, what a body, her ass was so fine, round and tight on long muscular legs, my cock was rock hard.

"Annie, why is the door open?" I asked. I was almost certain she was tempting me.

"What the fuck, are you peeping on me again?"

"No, the fucking door is wide open, what are you doing?"

"The fan isn't working, and the bathroom gets all steamy, so I left the door open," she replied. She was still naked. "I can't believe you're peeping on me again!"

"No, I wasn't, not this time. The door was open."

"Sure, and your cock is hard for no reason."

"But, I ..." I mumbled.

"Look, Matt, I won't tolerate you lurking and spying on me. Take off your clothes!"

"But, my balls still hurt from yesterday."

"Maybe you should have thought of that before you peeped on me again."

I didn't know what to do. I wanted to run from the house, but I didn't have anywhere to go. And Annie was still standing naked in front of me. She looked amazing. I did what she asked, I took off my clothes and stood waiting for my punishment. My cock betrayed me once again. It was rock hard.

Annie took a firm grip on my balls and began squeezing. The pain was intense. Her fingers pushed into my balls, deforming them until they were flat in her palm.

"Annie, please, it hurts so much. My balls are still sore from yesterday," I moaned.

"I know, Matt, it's supposed to hurt," she said, her grip tightened. I stared at her breasts, just trying to think about them rather than the pain from between my legs. She worked them over for another minute.

"When you think about peeping on me again, I want you to remember what is going to happen to your balls."

She let go of my balls and stepped closer to me. I felt her knee push up and between my legs, then she drew back and kneed me in the balls. I held onto her to stop her from falling. She pushed her knee up against my cock and balls. She took aim and again drove her knee hard up between my legs. I moaned loudly as her knee crashed into my balls. The pain was so bad, so overwhelming. My head fell forward into her chest, her breasts were just inches from my face. I watched closely as her knee drew back. No, not again. I waited for it. It felt like time stopped, and then my cock exploded.

"OH FUCK! ANNIE!"

I shot a load of cum between us, it landed on her stomach. We were so close that it was on mine, too. She kneed me again.

"ANNIE!"

More cum blasted between us, I had another overwhelming contraction, then another, each time she kneed my balls as I shot more cum on the two of us. My legs started to give out from the hammering my balls were taking. I slid down her body until I was on my knees. I held her leg and pushed her foot onto my cock and balls. She kicked at my nuts, and I shot cum on her foot. I pulled her foot up into my balls, and I rubbed them on it. I couldn't stop cumming, this orgasm was so insane, so fucking great, so dirty and depraved.

"I hope you learned your lesson!" she exclaimed. She grabbed her clothes and marched from the bathroom.

I grunted agreement, but the truth was that I just had the best sex of my life.