I desperately needed to use the bathroom. I always drink a big glass of water before going to bed, and in the mornings, I always wake up with a full bladder. Normally, that's not a problem, since the house in which I live with my mother and older sister has two bathrooms between the three of us. But the master bath was having plumbing problems. So that left the hall bathroom.
Mom had already gone to work. My nineteen-year-old sister Mandy was in the bathroom, taking her sweet ass time as always. Normally, I wouldn't care how long it took for my sister to get ready, but today was different.
"Mandy! Come on!" I shouted through the door, dancing on my feet.
"Go pee in the back yard, Charlie!" she shouted back.
I groaned. I was not about to go running out in the back yard and relieve myself when I could hear Mr. Denton's lawnmower running next door. Our fence is pretty low; I knew he'd be able to see me. I pounded again. "Mandy!"
"You're just gonna have to wait!" she shouted back. "Or youβ"
"Fuck this!" I cursed, and crashed through the door, breaking the lock. Mandy, clad in just her panties, screamed as I stumbled to the toilet beside her. She dropped her eyebrow pencil into the sink and slapped her hands over her tits.
"Damn it, Charlie!" she cried as I jerked down my shorts and aimed my dick at the toilet bowl. My sister stared in shock as I fired a powerful stream of urine into the toilet. I sighed in relief.
Mandy looked dumbfounded, maybe even mesmerized, staring at my pissing dick. I gave her a lopsided look. "Told you I couldn't wait, Mandy," I said. I couldn't help but notice what a nice body my sister had. A little soft in the middle, but her little paunch looked sexy, I thought. And she had a
damn
nice rack, I realized. C-cups, easily, and her hands did little but cover her nipples. Her long, wavy blonde hair was pushed back from her face by one of those headband-things. I could just make out the shadow of her pubes through the sheer white cotton panties she wore.
Mandy didn't seem to realize I was checking her out. She appeared occupied with my cock, her eyes wide. "I guess so," she commented softly, ogling my dick. I had been blessed with a large penis which, even soft, is long and thick. Rumors of my big dick circulated among the girls at school, but I was pretty shy and had thus for only gotten a few hand jobs and one half-assed blow job from Christy Summers.
I finally stopped peeing, shook off the last few drops of piss, then tucked my penis away. Mandy blinked, looking dazed, and turned her head. I noticed her cheeks were red. I wondered what she was thinking about.
I flushed the toilet, washed my hands as my sister got out of the way. I chuckled, looking at Mandy in the mirror as she turned away and grabbed her robe. For a moment, I saw her breasts from the side, noting how stiff and thick her nipples were. And so damn pink! But she closed the robe tight, and stared at me blankly.
I dried my hands, stepped past my sister. "I'll fix the lock later," I said. "Sorry I had to do that, sis."
"I-it's okay," she stammered as I left.
***
Mandy was weird around me all day, giving me these strange looks whenever we saw each other. My sister and I weren't real close, but we weren't estranged, either. Even though we aren't even a year apart in age (she was born in November, and my birthday's in October; for 36 days each year, my sister and I are the same age), Mandy and I never really hung out. She had her girlfriends, I had my buddies. Even when Mandy briefly dated my friend Teddy, my sister and I didn't really spend much time together, at least not alone.
I started wondering if Mandy had been turned on by my cock. Maybe I was a shy nerd at school, but I knew that a lot of girls were turned on by a large penis. And I sure as hell couldn't get her soft, voluptuous body out of my mind. I had seen a few girls naked (well, mostly naked) and had to admit that my own sister was one of the hottest chicks I knew.
Whoa, wait a sec, dude,
I thought as I was doing some homework for my Biology class
. You're thinking about Mandy like she's a piece. She's your fucking sister, man!
Yeah, and she was sure as hell checking out your rod. 'Course, I can't blame her for that . . . wonder what she'd do if she ever saw it hard . . . .
Hmm . . . wonder what I'd do . . . .
***
I got up the following morning, once more with a full bladder ready to burst. And once more, Mandy was in the bathroom. I had fixed the lock, but noticed that Mandy hadn't turned the bolt.
"Mandy, don't do this to me again!" I lamented through the door.
"Just come in and do it, Charlie," I heard her say with exasperation. "I've already seen your thing once."
I shrugged.
Okay
, I thought, and opened the door. I almost stumbled when I saw my sister's full, perfect round ass, totally exposed by the tiny red thong she wore. The way she was bent over the sink, her back arched and legs slightly parted, the bulge of her apparently meaty pussy was pretty damn obvious. I could just about make out the shape of her vulvae.
At least she wore a bra this time. It pushed her breasts together, forming some
very
tempting cleavage, the kind of cleavage a guy fantasizes being pushed up against his dick. I stared at her tits a moment in the mirror. Mandy stopped applying her makeup and stared back at my reflection with annoyance.
"Are you gonna just stare, or are you gonna get it over with?" she asked, sounding perturbed.
I tore my eyes from my sister's tits, then stepped up beside her, fishing my dick out of my shorts. I peripherally noticed my sister watching closely. What happened next, I later realized, was a carefully-planned choreography by my sister.
She dropped her eyebrow pencil, and this time it clattered to the floor beside the toilet. At the same time, I bent over and lifted the toilet lid. Mandy dropped to her knees as I straightened, her hair brushing my thigh as she groped on the ground. Her face was inches from my cock. The first drops of urine started dripping from the head of my penis, just before the imminent flow began.
Suddenly, Mandy, still on her knees, grabbed my hips, half-turning me to her, and dove for my cock, sucking the head into her mouth just as my urine gushed powerfully from my dick. I gasped, startled by my sister's actions, and almost stumbled back. But Mandy hung on, clutching my ass fiercely with both hands. Her brow furrowed and she winced as I pissed in her mouth.