Friend of sister teases me until I have to jack off and things escalate…

My family had a big place on a lake in Interior B.C. - several cabins, wharf, motorboat, large adjoining forested area. There were usually a bunch of people there from the extended family during summer vacation season, but this year (1970) my family had come out early and we were the only ones there for the first while. My sister had brought along a friend, Annie; both were slim, ripening 13-year-olds. I was 14 and an incessant masturbator, and had been cumming copiously wet for maybe a year. Annie and I got along well and I often fantasized about her while beating off - she had enchanting long, blonde hair and a very pretty face. However, my sister was somewhat jealous about anyone spending time with her, so Annie and I kind of held back from each other even though there was a bit of a mutual attraction between us.

People would spend a good deal of time on the big wharf, diving and swimming in the lake (nobody seemed to know about the dangers of over-exposure to the hot summer sun in those days). Until the place got more crowded, I would often sit on the bow of the motorboat, reading or generally observing what was going on. There was a thick, floating rope around the wharf so swimmers could hang on without floating away. 

Sometimes I would sit in the shade of a big tree back from the beach and scope out Annie or the odd female visitor. It wouldn’t take much to get me throbbingly hard and I would head off for a jackoff session in one of the cabin bathrooms or in an old outhouse that, being quite isolated, offered a good deal of privacy. Typically, I would masturbate several times a day - I was already a little cum machine and couldn’t keep my hands off my teenage cock.

One day while I was on the bow of the boat, Annie floated around the wharf and held herself in place near me with the rope. While we talked a bit, I noticed her hard little nipples under her bikini top and, as it was a day the Fortunes smiled upon me, some camel toe beneath her bottoms. I pretty much ran for the outhouse to give myself some hand relief. I didn’t notice that Annie followed me a minute or so later.

I dropped my cutoffs when I got to the outhouse and slowly stroked my erection, eyes closed as I visualized being with Annie. I soon drew pre-cum and the slick lubrication drove my pleasure through the roof. I knew about edging already and started into stop-and-start mode, increasing my cumload and building the pressure through my genitals,

Finally, I had to get my nut and went for the glory stroke, frictioning my cock faster and faster. Then I heard a gasp and, looking behind me, noticed a knothole in the outhouse wall. Someone was looking in, and I came maniacally as they watched, excited beyond belief at being observed. I had kind of turned sideways and the watcher got a clear view as I blasted rope after rope of cum on the walls of the outhouse. After I recovered from the pulsating, spurting orgasm, I cleaned the walls and my cock and hand with toilet paper.

I pulled up my cutoffs over my still-ropy penis and went around the side of the outhouse. There was Annie with her hand down her bikini bottom, rubbing away. She came quickly and quietly and strode away with a little smile.

Annie’s parents picked her up the next day and we never got a chance to talk about what we’d done or maybe even try something else. In fact, Annie and my sister had some kind of falling out not long after and I rarely saw her after that.