This happened when I was a senior in high school. 18 years old, yet stuck in prison for just a little while longer. My friend Sean, who had also recently turned 18, and I had been trying to make it through Mario 3. We took the bus after school back to his house, but when we got there, Sean realized he had forgotten something he had to get his parents to sign (for a club he was in or something). It needed to get done for tomorrow, so he decided to take his bike back to school while I got us past the first few easy worlds.
I had my backpack with me, so I took out my walkman and started listening to some music while I played (Pearl Jam's album Ten, I believe). Sean had just left when I heard the garage door go up.
"Hummm... His parents are home," I thought to myself.
No worries, they knew me well, and I didn't feel the need to yell down that I was there. Us sitting around playing Nintendo was not an uncommon occurrence. Sean's room was upstairs, and I had the door open. From where he had set up his TV, you could only see if anyone was playing video games by sticking your head completely inside and around the door. So, I hadn't set out to be a voyeur, I was just hoping to get to at least World 4 before Sean got back.
Soon after hearing the garage, I caught the sound of tromping up the steps. I turned my walkman down, then off when I heard Sean's mom laughing and giggling.
"No stop, hehehe," was the first thing I clearly heard.
I was only a teenager, but there's something inside every person that recognizes sexy, play sounds. The hair stood up all over my body, my hands started to tremble. Should I stand up and shout out now that I'm here? Sean's sister had activities after school, and I guess with Sean's bike gone and the bedroom doors open, they assumed that no one was home. I was terrified, but I really wanted to listen.
My headphones were still on, I had the perfect excuse not to come out to meet them should they discover me. Hey, I simply didn't hear them get home.
"Mmmm!! Ah! Hehe. Stop."
Holy shit. My indecision made the decision, they closed their bedroom door. The sounds were muffled now, but were still quite clear and they didn't seem to feel the need for quiet.
I stayed as still as I possibly could. I was terrified that at any sound I might make would let them know I was here.
"Mmmmm... Ahhhhh... Mmmmm..."
It was undeniable what was going on now. My heart was racing, my skin was flushed; but I was too nervous to get hard, I just listened. I heard the bed creaking around.
Sometimes there would be a lull, but then an "Mmm, oh yeah. Baby." His dad didn't seem to make any sound, only his mom.
"Oh god! Mmmm... Ah! Ah! Yeah baby."
I don't know if I had ever been more exhilarated in my life. The fear of getting caught and the thrill of hearing something I've never heard before was almost overwhelming. I strained to hear everything.
Finally the blood started to flow and my cock began to swell. As quietly as I could I unzipped my pants and started touching my virgin cock. She seemed to be getting more and more excited, I had no idea what was going on. Hell, I barely knew was sex was. The internet was still fairly new at this point and you could rarely see anything but pictures anyway. I had never heard a woman being pleasured.
She started getting louder. "Oh yeah. Yeah. Oh god. Yes."
I was stroking hard at this point, my bare dick exposed, the light fapping sound of my hand slapping the head of cock barely audible.
"Ooohhhh! Ooohh!! rrrAAAAAHHH!!"