I guess at 18 I was a bit of a late developer. I didn't know how to masturbate and no one had shown me. My first orgasm happened when I got out of the bath one evening and had a look at my sister Jane's panties in the clean laundry cupboard. I put on one of the most interesting pairs and felt my ass and cock through the thin, silky material. I looked at myself in the mirror and felt very sexy. It seemed wrong. My sister wouldn't like it if she knew. But being wrong and dirty made it more exciting. Suddenly I felt an unknown sensation rising in my cock and balls: like I wanted to pee but so much more intense and uncontrollable. I couldn't hold it in like I could with my pee. I whipped my cock out of the panties just in time and came my first load of spunk into the bathroom sink. I couldn't believe the feeling: so intense. It was a pleasure in the very heart of my body. That was the moment that changed my life, as I finally and belatedly became a man. I realised what it was all about and straight away started regular masturbation, almost every day. For a while after that moment of discovery - of the realisation that ecstasy was now freely available to me - nothing else seemed to matter. It was now just all about sex.
I soon moved from the clean laundry cupboard to searching my sister's bedroom floor when she was out for her used panties, interested in the material that had been pressed into her vagina all day long. I was shocked when I made my first find. They were so messy. She was two years older than me and so much more worldly wise. Clearly Jane had her own sexual awakening long before mine. She had really big tits and was popular with the boys. Her panties would usually have a long stain in the gusset of white and a hint of yellow. Even as I held them in my hand, I could smell them: so strong. It was the smell of sex, her hormones having produced various discharges and no doubt her arousal leading to a regularly wet pussy. I plucked up the bravery to hold them to my nose. My mouth watered and I had butterflies in my stomach. I started wanking as I sniffed them and, almost at the peak of horniness, I put out my tongue and licked them, tasting a pussy for the first time. That made me come. I continued wanking into my sister's panties whenever I got the chance.
Only a few weeks after this all began, I was home alone with Jane. We were both sat on the floor with the TV on but we were distracted doing other things. Then I had an experience that shaped my sexuality and my rapidly developing fetishes. As she sat there, I saw that her legs were raised and slightly apart. Her skirt had ridden up and I had a full view of her panties. But it was more than that. I knew her underwear well and she was wearing my favourite pair. They were white cotton with a light blue flower design. But the best thing about them was that above the gusset there was a slightly see through panel. Through it, I saw her black hairy bush in clear view, the first time I'd seen one. I was fascinated. And out of the sides of the gusset, a few pubic hairs were poking. I stared. I couldn't take my eyes away.
With Jane oblivious to my fixed gaze, I got so very horny. My mouth was watering and I thought of the many times in recent days that I had licked her pussy from her soiled panties while wanking. She seemed to be quite openly holding her legs apart. Surely she knew I could see up her skirt. But she was leafing through a magazine and occasionally glancing at the telly, seemingly aloof.
I got a real long look and my arousal was the strongest I'd yet felt. Having recently discovered orgasm, and as yet being unaware of all the social conventions you have to follow as a sexually active adult, I did something naïve. I started a fateful conversation about sex.
I looked at Jane and came out with it: "You know I wank?"
Perhaps I felt some pride in having finally discovered how it was done.
She looked up from her magazine and after a moment of silence, that I found tense, responded. "Do you?" And then, after another pause, "How often?"
I told her that I did it nearly every day, when I could. I didn't mention that I usually came sniffing her filthy used panties.
"Have you done it in front of anyone?" she asked.
"No," I said, honestly.
Her skirt was still open and her panties on show for me to see. I think that our unexpected discussion led her to be conscious of the fact that her legs were open and I had been looking. I think she realised that I had started the topic because I felt horny and it was from seeing her panties.
"But," I slightly hesitated, "I would do it in front of you."
"You would?" she questioned.
"Yes," I replied. "You can watch me wank if you like."
There followed an even longer silence. I felt nervous. I had taken a big chance. She could have slapped my face or, worse, got my parents to throw me out and get a place of my own. That seemed entirely possible. We had been close earlier in life but ever since puberty, Jane had been a bit of a bitch, more interested in boys than her little brother.
She was looking away and I could see that thoughts were going through her mind. Eventually, she looked back at me.
"Okay. I will watch you. When are you going to wank?"
I was relieved that the reply was positive. If we got discovered, I guess she would be in as much trouble as me.
"Do you want to go upstairs?" I said. "I feel like one now."
I stood up and headed upstairs to my room. She followed. I suddenly felt very nervous. The butterflies of sexual excitement came back to me. My legs felt weak and the stairs seemed to go on and on forever.
