I was at work one day when I felt the cell phone in my pocket vibrating. Things were going pretty slow at the shoe store I was working at so I looked to see who was calling. The screen read 'Ashley's Cell'. I figured my sister, Ashley, must have forgotten something at the store and was calling to ask me to pick it up. It was definitely against company policy to actually answer your cell phone at work so I just let the call go to my voicemail. Soon afterwards a cute brunette came walking into the store and I forgot all about my sister calling me.
I worked for a few more hours and by then it was 11 at night and time to close up. Quickly I was out the front door and on my way to the car. Almost out of habit I pulled my cell phone out of my pocket prepared to switch it from vibrate to ring. There looking back at me on the screen was the message telling me that I had a new voicemail message. I then remembered that my sister had called earlier and assumed that she left me a message. So with one quick push on the call button my voicemail kicked into action to let me hear the message my sister left me. What I heard stopped me in my tracks.
The next thing I knew I was listening to my 19 year old sister's voice quietly saying "wow I'm really nervous I hope you like this Brian." Before I go on I should explain that Brian is my sister's boyfriend. They have been dating for about 3 months and they make it no secret that they are having sex but they always do it at his house apparently. This wouldn't be the first time that I had gotten a message from her that was actually for Brian. My name is Brad so my number is right next to his in her phone and she sometimes doesn't pay a lot of attention to whose name she pushes. Apparently both of our voicemails just read off our phone numbers so it's hard to tell if you have the correct number or not.
After I heard that the message was for Brian I was about to push the delete button and not even worry about the message but I was interested. Curiosity got the best of me and I figured maybe I would get something I could make fun of her for. All of a sudden a long moan echoed out of the phone and bounced around inside my head. I then stopped dead in front of the store in shock. Several short moans later and there was not doubt that I was listening to my sister masturbating, this was something that her boyfriend was supposed to hear not her brother.
The message went on for about 2 minutes filled the entire time with moans until the very end when my sister whispered "god that felt good, I can't wait until you get off work tonight Brian." I just stood there completely stunned as the message ended. I didn't even delete the message I just closed the phone and looked at it completely dumbfounded. I quickly noticed a very uncomfortable feeling in my jeans and realized that I was rock hard, my cock threatening to break the button off of my jeans.
I kept thinking to myself 'but it's your sister' that thought really didn't help though. The sounds of her moans kept echoing through my head and my cock just refused to soften until I had driven about 10 minutes of the 15 minute drive home. By the time I was pulling into my driveway I had pretty much convinced myself that it was not a big deal. I mean I knew my sister wasn't innocent and it's not like I was supposed to hear the message anyway. I kept telling myself that she was my younger sister and to just forget about it and everything would be ok.
The second I walked into the living room though that whole idea was blown out of the water. There sitting on the couch was Ashley in a pair of little boxers and a tight tank top. All of a sudden her moans where in my head again and I didn't even have to look down to realize that I was hard as a rock again. I must have been staring blankly because Ashley just smiled at me and said "earth to Brad." Her voice snapped me out of my daze and I looked at her and gave her a weak smile and said "oh hi sis what's up?"
"Brian never called me that's what's up" she said all of a sudden in a very annoyed tone. "I left him a voicemail he was supposed to call me when he got off work."
"Well did you tell him to call you in the message?" I replied without thinking knowing what message she was talking about, since it was now repeating itself over and over in my head.
"Well no but he should want to after the message I left him" she replied quickly. Then deep red crossed her tan face as she blushed. I put on my best poker face at that point trying to hide the fact that I knew all too well just why she was blushing.
"I'm sure he'll call sis don't worry" was all I could say as I got out of the room as quickly as possible my cock still throbbing in my pants.
I hurried quickly to my room and locked the door. As the door shut I just stood there thinking about what was happening. It didn't take long though for my mind to wander. Soon I started to think about Ashley. Her long smooth tan legs that lead up to that small tight ass that looks so good in a bikini. Then her perfectly flat stomach sculpted by the countless miles she has swam in her life. My thoughts then drifting up to her beautifully shaped breasts, not to small and not to big just the perfect size. Finally my thoughts fell onto her beautiful face that makes her look maybe a few years younger than she actually is and her shoulder length blond hair framing it all beautifully.
Then, I suddenly came to my senses and shook my head trying to get those thoughts out. What the hell was I thinking this was my sister I was thinking about? I've always known she was attractive but had never thought of her that sexually before. I'll admit I had let my eyes linger when she walked by me in a bikini but that always seemed fairly innocent, thinking about those moments now it didn't seem nearly as innocent.
So there I stood in my room my hard on still raging in my pants not sure what to think about what had happened. Then all of a sudden I heard a knock on the door snapping me back to reality. I slowly turned to open the door and said "who is it?"
"It's me bro I need to talk to you." I could feel my cock jump in my pants as I heard Ashley's voice. Slowly I opened the door and peaked my head out trying to look as calm as possible. I couldn't help myself and my eyes slid up and down her body before I met her eyes.
"Hey sis what's up" was all I could say without giving away the thoughts that were currently running through my head.
"Ummm I was wondering, did you get a voicemail from me tonight?" Ashley said nervously. This was when I first realized that she looked really embarrassed. She must have wondered why her boyfriend hadn't called her back and then looked at her recent calls. This would mean that she then realized that she had called me instead of him.