I was 16 at the time living with parents and 14 year old brother. At my doctors advice, my mum had put me on the contraceptive pill. Not because I was sexually active, but I suffered very heavy periods. I was actually quite inexperienced when it came to sexual matters. I'd stroked a boys cock through his pants and made him cum, but nothing more advanced than that. I had only been masturbating myself for about a year and found it pleasing, but I wasn't sure I'd had a proper orgasm. I'd try it maybe once or twice a week, but never got that earth-shattering experience my friends often said they had. I'd stroke myself through my panties as I liked the friction around my clit. It usually meant they would end up damp and a little slimy, but mum gave me the 'talk' several years back so I knew it was normal.

It was one evening when I went to take a shower that something new happened. I'd taken off most of my clothes, wrapped a towel around me and gone to the bathroom to shower. I'd dropped my damp panties into the wash hamper, showered and left the bathroom to return to my room. Having done the girly things we do after a shower, dry my hair, apply body cream, etc, I returned to the bathroom to deposit the rest of my dirty clothing into the hamper. Taking the lid of the hamper off I found my panties from earlier had been screwed into a tight ball and pushed some way down inside some of the other clothing. Wondering who might have tried to hide them I retrieved them and found them soaked and gooey! It was then I realised it was a man's sperm. The sudden realisation that my brother (and I was assuming now) had masturbated into them made me feel kinda weird. It also turned me on a little too.

I took the panties back to my room for a closer inspection. The sperm, spunk, jizz, whatever it's called, was along the crotch area and had a unique kind of smell. It was not unlike my own slime, but different somehow. I wondered what it would feel like to have jizz in my panties whilst I was wearing them. I slid them back on, laid on my bed and gently rubbed up and down my pussy. It felt awesome, kind of rough but smooth at the same time. I continued rubbing up and down my slit hesitating at the top from time to time to pay attention to my clit. The jizz gave it added slickness and I could feel that familiar tingling in my lower stomach area. I imagined Jeff at school (a boy I had liked for some time) standing in front of me whilst I was in my panties, pulling the waistband away from my tummy so he could see my pussy as he pumped his cock towards me. I continued rubbing those slick panties up and down my slit and around by clit, picturing Jeff getting closer to the edge. My groin area was now on fire as my fingers pushed those wet panties around my clit. Jeff was close to cumming and suddenly shot several ropes of cum onto my stomach and into my panties. At the same time my innards felt like they had exploded and inside my pussy I could feel the most exquisite pulsing. Was this my first proper orgasm?

I never let on to my brother that I knew he was 'using' my panties, as I was onto a good thing here. I always seemed to orgasm when I used my jizz filled panties.