Incest Back Seat Sister Slip

[neerathemall]

"Are you really going out in public dressed like that?" I asked, gawking at my eighteen-year-old sister Shayla, my twin, dressed in the sluttiest Batgirl outfit I'd ever seen. Her ensemble, if you could call it that, included a sexy pair of black thigh highs that only enhanced her sex appeal, making my cock harden within my far more vanilla Luke Skywalker costume. I mean seriously, her skirt was so short, there was a good inch plus of bare skin showing between the skirt and her lace top stockings!

Fuck, she looked amazing.

Fuck, I hated that the hottest, sexiest girl I knew was flesh and blood and standing right in front of me on the one hand, but untouchable on the other, because she was my sister.

"Of course I am! But are you going out dressed like that?" She shot back sarcastically. She was a popular cheerleader dating a college basketball player, while I was somewhat of a nerd, who was so different from her that almost no one believed we were even siblings... but nevertheless, we were; twins, even.

Before I could come up with a witty response, she glanced down and checked out my fleshy lightsaber tenting out my costume... neither my boxers nor the fragile Skywalker fabric adequately restraining my not so secret salute, which was aimed directly at her... these cheaply made one-piece outfits not good at concealing anything, To make matters worse, it had snaps to open and close the crotch, that also opened and closed down its legs, which were only about four inches long. Didn't the designer know that guys above the age of two didn't ever wear things like this? But Shayla didn't care about that; she only scoffed, "Are you hard?"

"I'm eighteen; I'm always hard," I shrugged, trying to dismiss her obvious implication that my twin sister's hot outfit, her big tits, her nylon-clad legs, and her pink painted toenails were the cause of it. Truth was, I jerked off to her a lot... and to her almost as hot friends... I even used her soiled panties to jerk off with quite often, or with her pantyhose, after a game.

"Brent, I know you jerk off with my panties," she mentioned bluntly, making my eyes go wide.

I'd be a great con man... not... so I just stammered, "I-I-I don't know what you're talking about."

"Y-y-you don't know what I'm talking about?" she mocked... which she often did.

Attempting to regain some of my tattered pride, I responded with zero originality, "No, I don't know what you're talking about."

"Just so you know, the panties you snitched the other day had a big load of Mike's cum soaked into them," she said with a wicked smirk on her face.

My cheeks went an even darker shade of red... any slim chance she didn't know the truth vanished, as I went speechless. I often sniffed... and then sucked... the wetness out of her panties while reading incest erotica, watching faux incest porn and stroking my cock.

Which now made me wonder... had I sucked another guy's cum out of her panties? And then swallowed it? Gross!

"So, my dearest bro, do you usually just sniff the pussy juice out of my soiled panties, or do you actually suck it out of them?" she asked, sidling up to me...my cock aching even though she was shaming me... as I kept my head down to slyly admire her nylon-clad feet... which also turned me on.

"I've also figured out you have a nylon foot fetish," she said, now standing before me... knowingly wiggling her perfectly manicured and painted toenails.

"So?" I shrugged, that latter point not nearly as disturbing as the thought that I must have sucked her boyfriend's cum out of her panties.

"So... and I'm just asking, mind you... nothing at all personal... don't you think jerking off while picturing your hot sister...while using her cum-filled panties to do it... while also visualising her oh-so shapely nylon-encased legs and feet... is... perhaps... just a little fucked up?" she asked with saccharine sweetness.

"You're being ridiculous," I said, sticking with my complete verbal denial even though my expression gave me away.

"And your very own sister isn't the reason you're rock hard...right now?" she asked, astonishing me by unsnapping my crotch and grabbing my hard dick through my boxers!

"Oooooh," I groaned, shocked to feel my sister's hand on my dick.

"Oh wow, my baby brother has a big dick," she taunted. But she was rather astonished, judging from her tone of voice and the expression on her face. She always called me her 'baby brother' because she'd been born three minutes and six seconds before I was, and fuck, I always hated to hear about it.

Trying to regain a few shreds of dignity, even while, surprisingly, her hand remained on my dick, a fantasy I'd savoured hundreds of times... and!... fully aware my eight-inch cock was bigger than most guys'... I taunted back, "Yeah, it's probably bigger than your college boyfriend's."

She was quiet for a few endless seconds before she gave my cock a firm squeeze, and admitted in a soft voice more to herself than to me, "Actually, it's quite a lot bigger."

Stunned by her frank response, I remained speechless as she pulled her panties down, a red thong actually, and shoved them into my shocked, jaw-hanging-open mouth. "Here's a fresh pair for you to use. Or it's not technically fresh, since I came in them while Amanda finger banged me in the car before dropping me off today. And I know you want to fuck her, too."