Two or three minutes passed, still I kept my finger inside my sister and still she held my cock, both were wet from our cumming but my dick had gone pretty soft.
"Wow, Jan. What a birthday present!"
"You cold?" she asked smiling.
"A little. Everywhere except my middle finger..."
She giggled, slapped my arm and pulled away. We got back into our clothes and went back into her house. It was warmer in there, no night chill, and I couldn't help wonder what was next. My sister and I had teased each other, watched each other pissing, then got each other off. Hell, my jizz was still on her stomach. Was that it? Jan leaned back on the sink, hand behind her bum. She looked at me and I at her.
"Well little bro. You were always planning on staying here tonight, but you don't have to sleep on the couch..."
"Shit Jan. Wanking each other was one thing, are you talking about, well, sex?"
"You too pissed?"
"Yes. No. I mean not too pissed to want to but too pissed to make an intelligent choice. You are my SISTER and I only just got used to the idea of seeing your pussy and touching it, let alone...well fuck Jan. I only did it once before and it was shit..."
Her eyes lit up, sensing a scandal: "Ooh, do tell! Who? When? What happened?"
The mood lightened and I smiled.
"Susan Simpson. On the very day of my eighteenth."
"Susan!! I knew she was hot for you! What a minx! An older woman too mate - she's 21 already. But why was it shit?"
"Because I had no clue. I couldn't get it in, then I couldn't keep it in and it kept flopping out..."
Jan was giggling, breaking into full laughter. "Brilliant! Tell me more. And ALL the details!"
I was buzzing enough to play along. So I told her.
"I never even saw anything. We were standing up, behind a concrete post in the carpark of the Royal Hotel and I was pretty pissed. She took her panties off, I fumbled out my cock and then it all went fucked up."
Jan had started to lazily stroke her breast. "Did you come?"
"Yep. All over her thigh." Jan laughed. I continued. "She was pissed off cos she said she couldn't go back inside with THAT all over her leg. But she did anyway and we spent the rest of the night avoiding each other."
"Oh poor Dave. Standing up to do it is hard enough, but when you're drunk..."
"You ever do it standing up? I mean, you HAVE done it?"
"Twice, once standing up and once doggy. Both with Ronnie Swan, last year. In fact, both on the same day. It was OK. Just OK, not earth-moving."
Now I was getting horny. I had it fixed in my brain, Ronnie behind her, thrusting...
"Jan?"
"Yeah?"
"Let's learn together?"
"Mmmm. OK. Starting now. Or, actually, starting after we shower. I've still got your junk on my belly."
"Why not share the shower?"
"You wanna? OK. C'mon."