When I was in high school I started to become quite attracted to my little sister, who is two years younger than I am. It was no big deal at first. She was cute and I assumed it was normal and temporary. I didn’t think much of it. Then one day when I was home on break from college I happened to notice a pair of purple cotton panties in the hamper and I sniffed them and got so horny that everything changed. I was now obsessed, but my family and my sister are all very conservative religious people, and i would be disowned if anyone found out about my secret.

The second semester of college I thought about her every day. I hooked up with other girls, but eventually found myself virtually unable to come until I visualized my sister Marie moaning underneath me, rather than whoever it was I was actually with. I kept in contact with my family on video messenger, and I always hoped to get a chance to see Marie, but I tried my best to act normal when she did pop in. I couldn’t help but say things like “I’m sure the boys are lining up down the block to be with you,” and she would take it as a brotherly nice thing to say. Meanwhile my hand would be on my cock out of the screen. When classes came to an end, I was thrilled to be heading back home, even though I knew I could never do anything but fantasize.

After a couple weeks, however, I found ways I could act out and tease around with my fantasy in a relatively safe way. Her bedroom was right by mine and in between mine and the bathroom. I began to expose myself occasionally to her ‘accidentally.’ I’d have my flaccid penis hanging out of my pajamas and walk by at a time she would likely be looking. I’d pull my towel off right before I entered my room, in clear view of her. I would wait in my bedroom with the door half open waiting to hear her moving around and as she opened her door I would have my underwear at my ankles and pretend to pull them up quickly. All of these were portrayed as inadvertent and innocent and unlikely to cause any confrontation or suspicion.

I got bolder with her panties, too. Based on my trips to the hamper I could tell her purple cotton briefs were her favorites, as well as mine. One day I pulled them out of the washing machine during the cycle and stretched out the material on the crotch and ripped a couple threads on the seam. Sure enough, a couple days later the purple panties showed up in the hamper, stretched and with a nearly dime size hole. But she still wore them!

A few days later I went through her panty drawer when she was away from home and found out she must be wearing the purple ones. That night I took it to a new level. She slept very deep at night, and had a penchant for sleepwalking. I had tested the deep sleeping a few nights earlier by walking into her room and trying to wake her up with some pointless question to ask her if she did. Even with lightly tapping her face, grabbing her arm, and trying to roll her over she was sound asleep. Her history of sleepwalking also gave me a sense of security because I’d seen her be completely confused and not know what was going on in the middle of the night, so I could always suggest it happened again if I was caught in a precarious

That night, I snuck into her room, removed her covers slowly, but was disappointed to see she was wearing a pair of pajama shorts and a matching shirt. The shirt was pretty tight and would be hard to adjust, but the shorts were actually very short and had wide leg openings and I could get a clear look at her panties if i moved them aside. I had a tiny little flashlight and made my move, terrified but as aroused as I’d ever been. When i pulled the shorts aside, her panties bunched up a little. Those purple panties could be moved aside, too, I realized. just as i went to do it, she shuffled in bed resulting in me getting a clear look up her shorts at those panties. Once i was sure she was still asleep I carefully pulled the panties far enough to the side to see her puffy outer labia and gash, covered in fine blonde hair. I was so horny I could barely control myself, but this is as far as I could ever go. A couple weeks before this she had jokingly told me to pull my shorts up or buy myself a trimmer. It wasn’t a big deal then, but I was getting reckless and knew I had to stop. This was as far as I could go. I went back to bed and jacked off,

As years went by my obsession never waned, and I still got off on her panties occasionally, but never did any of those things again. I had pushed the limit and not been caught so I just kept my fantasy to myself. She is now happily married to a conservative Christian man and they live a life very different from mine. Everything is going well and they are happy and blossoming. A couple months ago they moved back to my parents house while they find a new home to buy. My parents live an hour away from me, and last weekend the whole family decided to spend the weekend there for my brother’s birthday. He, his wife and two kids, my sister, her husband and my parents all were there.

The first night was just a typical family birthday night. A big meal, a couple board games, catching up on everyone’s current affairs. Everyone changed into their cozy clothing after dinner, and I spent a fair amount of time sneaking careful glances before deciding Marie wasn’t wearing a bra. I could faintly make out the darker color of her nipples through her long shirt a couple times, or perhaps it was a figment of my imagination. Regardless, people faded away to bed pretty early, but I was restless.

I was on the couch watching TV, and at around 1 AM my sister came out of her bedroom to grab a glass of water wearing a thin purple nightgown. It was modest, but I could tell she was wearing nothing underneath, and i wondered if she had just had sex. My dick got hard again as she smiled and said goodnight, and went back to bed. My mind was taken back to several years ago and her 18 year old body and those purple panties. I remembered how I used to expose myself to her. My mind went places it shouldn’t have gone. She is a nurse and I knew she worked at 5:00 AM at the hospital the next morning. Four hours from now. I made a plan that could end horribly, but committed to it. After a sleepless night of anticipation I quietly went to the bathroom by her bedroom at 4 AM, closed the door most of the way but didn’t latch it, and kept the light off. I got naked and sat on the toilet and started playing with myself.