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."
She half skipped half swished past me and I followed her to the bathroom. My mind raced at what was about to happen. I was thinking that I was going to fuck my sister if she was going to let me. I was hard again before she opened the bathroom door and beckoned me in.
We stood face to face an arm's length apart. She turned sideways to start the shower, tested the temperature, then looked at me. Without taking her eyes away from mine, she reached down to the hem of her dress and pulled it up and off in one movement. She wore matching black low-cut bra and panties. Her breasts were full, rounded, and her cleavage peeked out over the vee of the bra. I looked down at her crotch, and back up to her face. She was smiling, her head crooked to one side, and then she beckoned to my shorts with her eyes.
My blood was raging now, and I made no ceremony of stripping fast and fully. Within seconds I was completely naked in front of my sister, dick sticking straight out, twitching with anticipation.
She smiled more broadly. "Wow. I did that to you?"
"Yep. Again."
She pulled at her panties, let them drop and stepped towards me. She took my hand like before, placed in on her slick mound like before, and said: "And you did this to me. Again."
I reached behind her to release her bra. I just HAD to see those tits. She understood, and probably also realised I had zero experience of unsnapping bras. She did it for me and I gasped at the wonder of them. As the bra fell away her boobs didn't move. Firm, full, round, with hard pink nipples pointing straight forward. Straight at me.
"Lesson One, little brother."
"What's Lesson 2?"
"In the shower. Right. Move over. OK. Lesson 2: Washing each other's bodies. With soap. Like this..."
Jan soaped my dick with a delicate touch and I groaned immediately. I steadied myself with one hand, with the other I soaped a breast, then her stomach, then I pulled her to me and stroked her bum.
My dick was again trapped between us like it had been in the garden with her hand on the shaft. I was impatient.
"Jan. I can't do foreplay right now. I'm gonna go off like a rocket any second."
"Oh, little brother. It's OK. We've got ages, no work tomorrow." She whispered; "Cum if you want to."
I closed my eyes and revelled in the feeling. My sister's hands soaping my cock, cupping my balls, and when I opened my eyes again there was the delight of seeing my sister naked with me. As my legs began to tremble slightly, Jan knelt and jerked with more intensity. Looking down I could see her perfect tits right in front of my cock, and that was it. I spurted all over her left breast as she cradled my cock to it, milking my every pulse until I was spent. She lovingly rubbed my cockhead over her nipple, spreading my jizz with it as she did so. She looked up at me, still smiling.