My sister and I rested for a while after the incredible orgasms we had just had. Unlike the first time we had been together, my cock was getting softer. I wasn't going to be able to do her ass.
My sister looked at my softening cock and said, "Looks like that awesome dick is taking a rest."
"Yeah, I'm sorry we cant keep going." I replied.
"Oh, who says we can't?" she said.
She leaned over and gently began to stroke my soft dick. She gently ran her fingers over the underside of it and around the purple head. There was no response. She then began to massage my balls with her other hand and still there was no rise. But my sister wasn't deterred, she just kept up her efforts and leaned over and started to lick my now soft dick. Her efforts with her mouth had little effect. My penis became a little more firm, but it seemed to be out of action for a while.
I looked at my sister, "I'm sorry." I said. "I wish we could keep going, but something seems not to be co-operating."
"It's not your fault." She said. "But who said we can't keep going?"
"What do you mean?" I asked.
My sister poured some more wine and said, "Well, we can do other things. A soft dick doesn't mean an end to fun."
She handed me one glass of wine and took a sip from the other.
"I had an awesome time last time and have so far tonight, but I think we have only scratched the surface; there are many other things we can explore." She said.
My sister had my interest. I had some ideas of what she might mean but wanted to hear her say it. So I asked, "Do you have something in particular in mind?"
"Please, don't act dumb. The way you fucked me in my ass would prove to anyone that you know how to do anal, probably form first hand experience." She replied.
I just grinned trying to look innocent. She could see right through me.
"Don't give me that innocent look. I bet you have tried fucking your ass before, lots of times I bet." She said.
She was partly right. There had been many times when I was dressed up that I would rub my fingers around my asshole. I would gently press against the opening and slightly push my finger in a little. Sometimes I would get more adventurous and glide my finger in further and move it around in my ass, rubbing against my prostate and making myself cum in a way I had never experienced before. But I had never gone farther than just my fingers. The technique I had used in fucking my sisters ass I had picked up from reading the stories others had written.