Friday Night insanity with my wife's sister

It was a long week. A bad week, really. We had a lot of stress and everything was just tense. My wife (50) went out with some friends and I (50) knew she wouldn't be home until Saturday afternoon. When she starts on "Wine With The Girls" there's trouble. That's fine! But it left me at loose ends with an empty house which is really rare.

I got a text out of nowhere from her sis (46) saying that she'd seen that my wife was out on the town with the girls. Some post on some thing that she does. Whatever. I said that yeah, things were quiet around the house and I was trying to unwind. She asked if I remembered vacation.

Yeah, I remembered it. We hooked up and had a great time. Did I want to try that again?

I should have said No. I didn't. 20 minutes later she was ringing my doorbell.

We started making out right there when the door closed. At least we waited to get to the bedroom before she was naked. We were both dropping clothes fast. I don't remember her ass being that big or looking that good before. I also don't remember feeling so desired and so turned on in a long time.

Her mouth was amazing. Her tits were amazing. Her pussy? I don't remember fucking that hard or cumming that hard in a long time. We had three rounds before we collapsed together. She slept over which was dangerous as fuck but also really hot.

The hottest thing the whole night and the thing that will haunt me was her riding me with my hands on her tits and looking me dead in the eyes and saying, "Tell me you married the wrong sister." I almost came right there.

We've exchanged a few texts since, but we're playing it cool. It probably won't happen again.