Joshua’s balls bounce with each upward stroke of his uncut cock. I watch as he works himself, stroking his cock until it's swelling in his fist. His cockhead emerges from his foreskin, and he dips his thumb along his cockslit with a shudder as he continues fisting himself. I look from his cock to his face, surprised to find him watching me expectantly through hooded eyes.

“Are you sure?” I ask.

“Of course I am,” he says, shaking his cock at me. “Look at how hard I am just thinking about it.” He strokes the full length of his shaft, sighing as he slides his foreskin back over his cockhead. He holds it for a second, then peels his foreskin back again. A bead of pre-cum is already forming in his cockslit.

“I know, but are you sure?”

He lets go of his cock, shifting into a more comfortable position on the built-in shower bench. “Am I sure?” He snorts. He stretches his legs out before him, taking up more of the limited stall space and trapping me in between.

“You know what I mean.”

“I told you I wanted to be pissed on.”

“I know, but I didn’t think you were being serious.” 

“Why wouldn’t I be?”

“Because,” I scrunch my nose, “it’s dirty.”

“You didn’t think it was dirty when you were rubbing your pissy cunt for me a few days ago.”

I blush at the reminder of our last sexual encounter.

“Don’t pretend you’re not interested,” Joshua grins. “Or else you would’ve pissed before joining me.”

My bladder tenses at his words, and I clench instinctively. The fact that Joshua is right embarrasses me; I haven’t been able to stop thinking about how aroused he was—from just the suggestion!—and I'd be lying if I said I wasn't a little bit curious.

He starts palming his cock again, eyes dropping to my clean-shaven mound. I take a half-step forward, and he curses under his breath as he squeezes his cockhead. I rest one of my feet on his thigh, and his face lights up with anticipation as he wraps a hand around my heel. 

“You want this?” I ask, parting my folds. Joshua licks his lips as I arch my back, aiming my pussy towards his crotch.

“Yes,” Joshua moans. “Please. Piss all over my cock.”

I relax, surrendering to the moment, and begin to relieve myself. Droplets of piss trickle down my inner thighs as my urine stream grows in force. I sigh in relief as pressure releases from my bladder. Joshua groans a ‘yes’ and rolls his head back against the tiled shower wall, eyes fluttering shut. He unfists his cock and rests his hand on his thigh, allowing my piss to shower his cock and balls unobstructed. 

“God, that feels so good on my sack,” he moans. “Your piss is so hot.”

“Yeah?” I ask, starting to grow aroused.  “You like showering in my piss?”

Joshua opens his eyes to look at me. “Yeah,” he grins. “I love being my stepsister’s toilet.” 

His hips thrust of their own accord as I continue to wet his cock with bursts of piss. My stream lessens as my bladder empties, so I bear down and force the last of my piss out with irregular, weak bursts. "I'm going to cum," Joshua groans. "I'm going to fucking cum from your piss." His cock bobs in the air, shining and rigid, and the sight is more arousing than I could've imagined.

I feel my arousal beginning to bead down my inner thigh, mingling with the remnants of my piss. Joshua eyes my mound, but I have no more to give, so I start to rub myself instead, smearing the fluids across my outer pussy. 

He curses under his breath, face tensing, and I drop my eyes back to his crotch as I continue to rub myself. His balls draw up tight before cum bursts from his cock, shooting thick ropes across his lower abdomen. "Uhn, fuck," he whines, legs tensing against me as globs of ejaculate pump from his cockslit and down his shaft. "I can't stop cumming," he gasps, resting his head on the tiled wall again.

I start to thumb my clit, watching in awe as cum continues to leak from my stepbrother’s softening cock. His balls twitch as he spills the last of his seed. He forces out a breath as his pleasure subsides and fists his now sensitive cock with a hiss, before giving himself a few deep strokes. He pushes his foreskin back over his cockhead, and my mouth waters at the sight of his ejaculate pooling in the crevice. I curse the cramped space, wishing I could drop to my knees and lick him clean.

“Fu-uck,” Joshua says with a shaky laugh. “I didn’t think it would make me cum so hard.” He releases his now-flaccid cock, and it drops between his legs with a swing. I can’t help but fixate on the obscene way his cock and balls rest in the cum that’s pooled beneath him.

“That was hot,” I admit. “M-maybe, we could do it again?”

“I won’t say no to that,” Joshua grins. He sits up straight as I withdraw my hand from my pussy. “Come here.”

“What?”

“Come here,” he beckons, hooking a hand around my thigh. “I want to lick your piss covered pussy.”

I stumble forward, resting most of my weight on his thigh. His mouth closes over my clit, and I moan, burying my fingers in his sweat-slick hair for perch as I grind against his face. I had barely been touching myself, but I'm already so close to my own orgasm.

Joshua lets me hump his face as I chase my pleasure, thrusting my clit against his tongue like it’s a mini-cock. I’m not prepared when he sucks in his cheeks, and I moan loudly as his mouth suctions around my clit. “Oh, Joshua,” I moan. He runs his hand up my thigh to my ass cheek and holds me in place as he sucks me off, head bobbing between my legs.

"J-joshua... I..."

He starts flicking his tongue back and forth across my clit, and I cum with a whimper. I shudder as the pleasure rolls through me and I rock against Joshua's mouth, wanting to prolong the feeling. He pulls off my clit when I've calmed down and presses a wet kiss to my clithood. “Fuck,” he sighs against my mound. “Your pussy always tastes so good.”

“Even covered in pee?” I can’t help but giggle.

“It’s even better covered in pee.”

He lets go of me, and I stand freely, turning to face the shower handles. I startle when Joshua slaps my ass cheek, the sound echoing around us. “Joshua!” I gasp, turning to look at him from over my shoulder.

“What?” He asks. “You put that fat ass in my face, and it was just so tempting.” 

“You’re unbelievable.” 

“I just came, but I could probably bust another nut from just looking at your fat ass."

“You’re a pervert.”

“Yeah,” Joshua laughs, “but look me in the eye and tell me you don’t love it.”

I can’t argue with that.