[ashdowns]

This goes back quite a few years now. My wife and her elder sister, 15 years older, have always been very close. They still spend hours talking to each other on the phone. To me, Sue (not her real name but close) was just easy to get along with, always cheerful and chirpy but not sexually attractive. You would hardly know that they are sisters when you see them together.
She got divorced from her husband due to his serious drinking problem and moved as far away as she could. A good 250 kilometers away. She rented a small bungalow and got herself a job at a local garden centre. We agreed to let her have some of our unwanted furniture, and that I would hire a small van and deliver the items.
Traffic proved a lot heavier than expected so I arrived later than scheduled, around 9 in the evening, feeling a bit wrecked. Sue had just come back from a drinks party and was obviously tipsy. I had always known her to wear baggy clothes and trainers and couldn't remember ever seeing her wearing any makeup. She had a manual job and was lugging heavy objects at work. But when she opened the door she was in a tight dress, high heels and fully made up.
And most unexpectedly she had a little anklet - which has always been a huge turn on for me. I called my wife to say I'd safely arrived. She asked how I was finding Sue, so I told her of my surprise. "She's been on her own for a while now, said my wife jokingly, she must be looking for company. Be careful, she might jump on the delivery man..." but she left it at that. I could sense something in her voice. I started to forget about the hours spent behind the wheel.
The dress was very short and those legs I had never seen or paid attention to were in fact superb. She offered to prepare me a snack. I started imagining what she looked like with no clothes on, her muscular body, you know what it's like. We shared a bottle of wine chatting over the kitchen table and she became flirty. We started talking about her divorce, the lack of companionship, until I felt I could risk making the suggestion : if she wanted to have sex I'd be only too happy to oblige. She gave me a big hug and it didn't take me long to undress her. She took me to her tiny bedroom and we fucked liked animals through the night and most of the morning.
The final surprise was when I arrived home. The sisters had been on the phone... My wife asked me to give her a full description of what had passed and we to this day it remains one of our biggest turn-ons.