This story includes some marginal incest between consenting adult siblings. If you don't like that, don't read ahead…
I originally posted this story in /r/incest 2.5 years ago, in Dec 2012. A new Reddit friend who read my post history suggested I post here. So here goes:
I'm male, aged 32. The event described in the title happened in 2005. But first, some back-story:
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My sister (I shall call her Carly) is my half-sister; same mother, different fathers. She is 7 years and 6 weeks older than me. Her friend (I'll call her Kyla) is only one month younger than her, making Kyla 7 years and 2 weeks older than me.
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Kyla and I started fooling around one day while she was visiting our place. Our mum had gone out and my sister was taking a nap. Kyla did NOT force me, I was the one who initiated it, and it took some convincing on my part before she gave in. It progressed slowly over several years after that. My sister was suspicious, but never knew for sure (and I found out later she didn't really mind too much). I was hitting puberty, they were late teens when this started in the 1990s. Then it kinda stopped for a few years.