Two's Up

There are two older sisters (40's) who live together at their cottage about half a mile from my place.
And both sisters are being fucked by one guy, me.

They're both very keen swimmers and both enjoy extremely kinky sex.
I met them at a river swimming event last summer and both women began chatting me up.

I didn't know they were sisters at first even though they had the same swimming costume on. So as a kind of joke I asked them if they shared the same man.
Without any hesitation they both said they'd gladly fuck me together.
Trust me, they were far more forward than I was, and believe me even though they're in their mid forties, it's not easy keeping up with them sexually.

I was invited round the same evening and within half an hour I was naked, having my cock sucked and my face pushed into the older sisters pussy.
I went on to tongue and fuck them both, with the younger of the two enjoying anal sex too.

When I walked the half mile back to my place later on, I was totally knackered, but knew I wanted more.
Unfortunately because of their working schedule, I've only had sex with them both together three more times.

Mostly I get to fuck the older of the two, but I much prefer fucking the youngest as she's such a sexually inventive slut. And she does something for me I've grown to adore.
Whenever she sucks my dick, she'll also rim and finger my arse. It feels incredible and she'll also finger my rear hole when we fuck missionary too.
I cum so violently with my cock up her tight c**t, her tongue down my throat and her fingers probing my arsehole.

They're not the best looking women, but believe me they're utter sluts and I'm loving the sex. Plus neither want me around permanently, which suits me just fine.
As the oldest says to me "You're our walking dildo".