Sister in panties did it for me
As a teen, I was seemingly way behind the learning curve, but I was forever curious and horny. I had a few magazines, and always liked when I could see hot photos of women in panties, upskirts, etc. From time to time, I would see my sister in panties at home (she's 17 months older than me). I couldn't understand why it made me so crazy, but it did. I was often trying to find ways to peek, and snooped around all the time. If she wasn't home, I was going through her panties and things. I was mesmerized. I also learned that about exhibitionism before I knew the word existed. I would lie on my bed, face down, naked, pretending to be asleep, knowing that she would be coming home and would have to walk by. My heart would race as I heard her footsteps, and if I sensed that she was in the doorway, I would just explode onto my sheet. I would also peek through the keyhole or door jamb and masturbate to her in panties. Afterwards, I would feel guilty about it, and longed for punishment. Anytime I saw her in panties, I would have to find time to cum. I still think about it often!