"Jesus, Amy. What a mess. When did you get so dirty?"
"Always have been, as if you didn't know."
Memories, old and new came back. She was right. She was gorgeous, yes, but she'd always been a bit dirty. I was going to explore just how dirty she could be.
It wasn't long before we both giggled at our boldness. There was a party at our house, we'd soon be missed, yet here we were laying on my sister's bathroom floor, still in a puddle of her piss, my cum shiny on her tits. Our breathing was still deeper than normal, and I felt a new burning in my cock. My pubes were still wet from her piss, and I was ready to give her some back. I knelt between her legs, which she opened wide as if by reflex, then held my cock in aim, and looked into her eyes for permission. She bit her bottom lip and nodded.
Still half-erect, with some clear cum dangling from the end, my cock twitched and shot a short stream that landed on her thigh. Another hit her pubic mound. Amy propped herself on her arms to watch, and I managed to relax enough to let go fully. My pale yellow stream hit her left nipple, splashed all over the place, then her right nipple. Amy opened her cunt in signal. I stopped my stream, got closer, and put my cock right on her clit. The noise of my piss hosing her clit was so loud I wondered if we could be heard even above the party. Amy ooohed, giggled, and opened her pussy more. With my knob just inside, I filled her womb with pee, saw it gushing back out, watched her tummy and amazing tits jiggle as she laughed at our game.
As the last of it slowed and stopped, we looked at the enormous puddle on the floorboards and laughed.
I sneaked across the hall, brought extra towels back, then went to shower and change.
Back at the party, Amy followed me a few minutes later. She'd changed into jeans and a tee shirt. When someone asked, she gave them the cover story that she and I had play-wrestled and got a drink spilt on us. Everybody knew us, it was entirely plausible. Amy enjoyed her party, I enjoyed mine, and it faded as things do until the last friends left in a taxi.
I had my arm around Amy's waist as we waved them off. Through her smile, she said: "Thank god. I'm busting to piss!"
"Oooh, nice! I'm looking forward to it."
"Who said you were invited?"
We had turned back to the door now. As soon as it closed I grabbed her and tickled: "I invited myself."
"Fuck off! Oh, not fair! Jeez, no... Stop! Stoppp or I'll pee myself!"
It was no use. I knew all her ticklish spots and I'm strong enough to hold her. She stopped struggling, I held her firmly, and she turned so we were face to face. She pushed my chest gently, saying: "Get down."
I sat on the floor, just inside the front door. Amy turned to face away, put one foot each side of my thighs, and undid her jeans. She teased them and her panties down, wiggling her butt, until they were at her knees.
"Looking, sport? At my pussy? Just watch..."
The seconds passed. I looked intently at my sister's glistening pink pussy and tiny asshole, less than two feet from my face, pain in my groin increasing as my cock throbbed. Amy stood slightly bent, keeping still, concentrating on her needs. She exploded piss onto my chest, hot and straight, splashing my chin, drenching my shirt, slowly soaking my jeans until I could feel it wetting around my aching cock.
It was too much. I jumped up so fast that Amy was left emptying the rest of her bladder noisily on the floor tiles while I wrenched my jeans down and plunged my cock inside her.
"Oh, nnngh. Dave! Shit. That's the hardest cock...I... ever... Mmmngh."
It was true, I was like iron in those moments, so hard it almost hurt. But Amy had her hands on the wall for steadiness while I pushed in as far as I could, so far that my pubic bone was squishing her pussy lips apart. I held it there, lost in the fog of lust that overcame me, for some little while until I needed to empty my balls, urgently, fully. My thighs began slapping hers, she held firm and let me fuck her desperately, pulling her onto me with my hands on her hips, watching my shiny meat emerge and disappear so fast that my thighs trembled at the effort.
Her piss dripped from my shirt onto her ass cheeks. I watched it run around her butt as I fucked, saw it drip to the puddle on the floor, and I fucked. I heard her moaning, and fucked. Felt myself grunting from my soul, and fucked. Maybe it was two minutes, maybe three, but when it came over me I swear I lost consciousness. I thought I could actually hear my jizz spurting inside her, knew nothing but the sensation of cumming and the feel of my sister's pussy gripping, welcoming me into her farthest depths, and I wondered if the pulsing would ever stop as I threw my incest into her, wanton and desperate, impossibly orgasmic.
I slowly came back from wherever I'd risen to, thighs trembling and chest thumping, increasingly becoming aware that the astonishing creature in whose depths I'd buried my cock, my own sister, was gently pushing her hips back at me. She sensed when I was with her again, and said: "I think my little brother liked that. Huh?"
"Oh shit Amy. Jesus girl. So good."
"No, don't take it out. Stay there..."
She pressed slowly, gently. We enjoyed this sublime intimacy, brother and sister, for a few minutes without speaking. Amy's ass rotated a little, still I stayed hard inside her impossibly warm, wet glove. As it continued, I became aware that she was pulling at one nipple while the other hand was on the wall in front of her, and I noticed the slight 'thwap' of her thighs against mine - wet from piss, pussy juice and cum - and heard her breathing getting deeper.
I was drained, but just as my sister had let me fuck her selfishly, I now supplied the cock for her to build her own satisfaction. I only hoped I wouldn't let her down. Fearing a deflating cock, I began to match her gentle pace and pressure, and reached under her t-shirt, pushed her bra up and over the orbs, and began tweaking her nipples.
It had the desired effect: Amy's hand held mine in place, and she fucked me a little more urgently, moaning through gasps, rising to panting. She was whispering something that I didn't fully hear, something about loving fucking her own brother. I was surprised when her thighs trembled in a little orgasm. She tensed her cunny walls, I felt more wetness and heat, then she bucked against me again. This time I joined in fully, still almost fully hard, and was rewarded with a deep groan as she pressed back and trembled quite strongly. Still she wasn't done. I thought maybe I had another ejaculation in me yet, and kept up the pace.
"Oh Dave. Ummm, that's good. I'm gonna cum again. MMmmnngh. C-cumming, Dave!"
Her third was a carbon-copy of the second. Her trembles seemed to come from her soul, through her tummy and thighs, to concentrate in the hot, wet flesh of her cunt, where I now, impossibly, felt my cock jerk furiously three or four times. Utterly spent, I collapsed on her back and my cock fell out of her to rest wetly against her thigh.
Amy turned to me and pulled my face to hers, our tongues lost in each other's mouths, breathing into each other's faces, and she said: "For the rest of my life, little brother, as long as I have breath you have someone who wants to fuck you."
I smiled. She smiled back, then her face took on a quizzical look as she realised what I was doing.
Trapped between our stomachs, my pussy-wet cock added to the stickiness by emptying my pee onto her. I laughed as it splattered onto the tiles, and she said: "You're a dirty little bugger, bro!"
"Hate it?"
"Fuck no. Just saying though - beware if you fall asleep any time soon. I might piss on you."
"Promise?"
She kissed me again. "Yeah. Promise."
I thought she'd been joking, about pissing on me while I slept. I fell into a deep sleep that night, exhausted after the late party and totally satisfied with my sexual liaison with Amy, my sister. I had vivid dreams, too. Amy's tits, her smile, the blush of her cheeks when she cums, her tiny rose-coloured asshole... Mostly, though, it was the smooth slit, the pink inner folds, and the sheer allure of her pussy. A lot of what I dreamed involved Amy pissing, for me to watch, on me, with me. Emerging from the fog of sleep, in that zone between dream and consciousness, I realised that dreams aren't wet-warm and don't have sound. In other words, the naked creature straddling me and pissing on my crotch was my sister, and she was really doing it. She giggled which made her stream shake and falter, but she didn't stop even when I was shocked into wakefulness.
I lunged and grabbed her, giggling and struggling, then pulled her down on my bed, face down, with me on top of her.
She was still giggling despite the soaking mattress staining her nightshirt. I pulled it up to exposed her butt, grabbed my morning wood and told her she was going to get it. She giggled as I entered her, laughing at her own boldness, and we fucked slowly with her pushing her ass back at my stomach while I pressed my weight on her back, submissive, yet totally in control.
She is Amy, my sister, and we will always belong to each other.
