This just happened Friday night.
Sue and I were sharing a bottle of wine and reminiscing about the good old days. We were talking about that naked play from the 70s. I had always wondered whether that guy who said she was tight, let's call him "Randy", had really slept with her, and I wanted to mess with her a little bit. Here is what we said, as far as I can remember:
"Hey Sue, tell me the truth, did you have sex with Randy?"
"Hell no! Did Randy tell you that? He's a freaking liar!"
"I figured he was lying."
"Of course he was, I would never go for a guy like that." This was questionable. He actually seemed like her type, back in the day.
"Hmm, I don't know, but there was something he said about you that made me suspicious..."
"Come on out, out with it!"
"He said you were quote, very tight."
"Wow, that is very explicit... What a minute, why did that make you suspicious?"
"Umm... this is really embarrassing."
"Yes, I am embarrassed to have this conversation with you, but there's no turning back. Why were you surprised?"
"You have wide hips. I don't mean that in a bad way."
"Wide hips?! You fuckin' idiot! That has nothing to do with a women's hooha."
"Well, I can only say that from my experience it does. But if you say you are tight I will take your word for it."
"You better!"
That was that, for a while. We got deeper into the bottle, and I told her a bit about my sexual adventures in the 70s.
I made a point of telling her about a girl I was with who had wide hips and a relatively large vagina, being sure to give her meaningful looks, as is to say, "Here is the proof."
Sue stewed on this for a while, and we finished the bottle. Finally she said, "Fine, if you are so damn curious you can stick one finger in. Once. But I'm not letting you do anything else. I'm still your sister!"
Sue immediately stood up and pulled her jeans and panties down. Her c*nt was right in the my face. The dark hair was shaved into a neat triangle. She spread her labia open and I could see her clit and her little fuckhole. However, she was obviously not that aroused. (Keep our age in mind.)
"OK, let's get this over with. Stick it in. Your finger, I mean"
"Sorry," I said, "This won't work. You obviously don't, um, have your engine running, so I know you are going to be tight. That doesn't prove anything."
We finally agreed to watch a porno together. It was cheap and cheesy, but the guys had big dicks and it obviously worked for Sue. Her jeans were still unzipped, and I caught her rubbing herself a few times.
After about 10 minutes, Sue said, "OK, let's get this over with." She stood in front of me and dropped trou again. This time her pussy was obviously wet. I could smell it.
"OK, you can stick one finger in, once. If you ever tell mom I'm going to murder you."
This was the moment I'd plan for all along. I'd done some crazy stuff with Sue before, but never actually penetrated her. I stuck out my middle finger, and inserted it as deep as I could.
There are no words to describe the inside of a wet vagina. It was paradise, and indeed very tight.
I would have left it in all night if Sue left me.
After what seemed like a long time, but was probably under a minute, Sue said, "That's enough. I'm going to bed." When I pulled my finger out, there was a quiet pop, like a champagne cork. We went to our separate bedrooms, but I could hear her moaning through the walls for a while.