Kim's Sister the Slut Pt. 05

[BACKGROUND and SPOILERS: I live with my girlfriend, Kim. Kim is a 23 year old, green-eyed cutie with a bubbly round ass and wavy auburn hair. Kim's 18 year old sister, Katie, got kicked out by her parents and was staying on Kim's couch while she finished high school. Katie's got just a hint of that baby fat look, with large D-cup breasts and an hourglass shape. Katie, a certifiable troublemaker, wormed her way into our sex life (Pt. 1 and Pt. 3). Eager for some privacy, Kim and I fucked at her office (Pt. 2), which led to Kim's secretary, the short and curvy Rita, blackmailing Kim and making Kim watch as I fucked Rita's ass (Pt. 4).]

*****

About a week after my tryst with Kim and Rita, Katie finally returned from her trip to California to visit family. In fact, she called and begged me for a ride home from the airport. Normally I would have just sent an Uber for her, but I was eager to tell her about Rita and my half-baked plans for Kim. I hopped into my car and headed to McCarren Airport, hoping that we could make it back before rush hour ruined our evening.

I arrived at the airport a bit early, so I pulled up to the short term parking garage and headed inside to find Katie's flight. I found the correct baggage terminal, saw that I had some time to kill, and sorted through some work emails on my phone. My head was buried in work when I felt arms wrap around my waist and a pair of big tits smash against my back.

"Roger, thanks for coming!" Katie was certainly practically lifting me off the ground with her surprisingly strong bear hug, my hands pinned at my side as I tried not to drop my phone.

"Ah, fuck!" I yelled as my phone dropped anyway. At least McCarron has some gross ugly carpet to (hopefully) prevent my screen from cracking as it hit the ground. I felt a flash of anger, or maybe just intense frustration, at the rude interruption. I reached my right hand around and wrapped it around Katie as best I could, then stood up and bent over, picking Katie up off the ground in the process and holding her hostage. Blindly, my right hand had grabbed onto ass cheek covered by some soft shorts. I felt the tip of my middle finger graze some soft, warm flesh, likely nestled where Katie's butt met her inner thigh.

"Stop, that tickles!" Katie cried almost desperately, shifting her hips left to right almost violently. "Put me down!" I moved my hand and stood up slowly. As I raised my head, I caught a woman staring daggers into me. She had short blonde hair and a stern look to her. The woman looked directly into my eyes for a few seconds before turning away in disgust. I'm not sure what her problem was, but it reminded me that we were in a very public place. I disentangled from Katie and took a quick step back.

"How was Chico" I asked eagerly, attempting to keep things between us modest. At least until we get out of the airport.

"Fucking boring, as always. But I did my family time, so now I can safely ignore them again. Maybe forever this time."

"Don't burn your bridges, Katie, Kim and I won't always be able to be there for you, and you might need them again some day."

"Nah, they're useless. They always want something in return, you know?"

I didn't know what she was talking about. "Of course, I know the type," I lied. "Anyway, let's get your stuff and get out of here. I want to beat rush hour. And we have to catch up."

"Oh, did something happen?" Katie was practically winking at me. Did Kim already tell her? Just like she was shy about her hook up with Katie, Kim was a bit shy about the threesome with Rita, and I wasn't going to push it. Not without help from Katie, that is.

"I just have a really, really good story is all," I teased her. "I think you'll like it, but not until we're on the road."

"Mmmm," she practically moaned. "Sounds hot. Let's get my bags and get moving before I get too tingly."

We sat by the baggage carousel and caught up on little details. Katie's (and Kim's) aunt Molly had just gotten out of prison for a bar fight. Molly swears that she wasn't the instigator, but she was the "winner" of the fight and had served a 3 month sentence at some minimum security women's prison upstate. She got out and returned home, which is what prompted Katie's visit, but she got hit with a civil lawsuit for breaking the other woman's jaw.

"So do you have any friends that can help her out?" Katie implored. "Please. She's a good person, and she was just trying to defend herself. She can't afford to pay $250,000, and she can't afford a lawyer."

"I'll ask around. Maybe I have a client that can put in a good referral. Might just be as easy as making the right introductions."

"Thanks, Rog, you're sweet," she replied. I got a nice little hug, this time sort of sideways and much more genuine than her excitement fueled mugging earlier. "Kim's lucky. Speaking of, where is the little mynx?"

"Working late tonight, unfortunately. Work can be a pain in the ass," I said, triggering memories of Rita's tight ass clenching my cock as she came all over Kim's face. I will never forget that moment, nor would I forget the plan that it hatched.

Finally, after what seemed like an eternity, Katie's TWO GIANT BAGS (seriously, a 2 week trip?) came down the shoot. I popped out the handles, grabbed them both, and headed to the car while Katie (and her cute little caboose) walked just in front of me with an eager gait. Time to work on that plan.

I got Katie's ridiculously sized bags in the back of the SUV and climbed in the driver's seat. Katie was clearly waiting for me with anticipation, her hands folded in her lap in mock obedience and her look betraying her excitement.

"So, tell me! Tell me, tell me, tell me!" Katie's immaturity really highlighted her youth. She's obviously experienced sexually, but she's still 18, impulsive, and lacking in self-control. My gaze slips over her. I notice that her hair is mostly up, with just a few strands hanging down the side of her neck and coiling on top of her collar bone. Her fitted sweater has a high, rounded collar, revealing no cleavage or even a hint. Katie's large, perky breasts heaved with each of her breaths, just a hint of a hard nipple underneath the fabric. She wore comfy looking cotton shorts with larger leg openings that teased a peak at her panties without quite allowing enough light in to see.

"We made out. That's it."

"Fuck you, tell me!"

"I will, but let's get on the highway first. It's the type of story where you're going to want details, and getting out of the airport is always a pain in the ass so I need to pay attention."

Katie stared at me with her brow furrowed. Finally she looked away. "Fine!" She huffed indignantly. She was pretty cute when she was angry. "Let's go, then! Andale!"

As we got on the highway I started to tell Katie about Kim and I fucking at her office, and how Kim left her panties on the floor after we finished.

"Wait, did someone find them? Is that what this is about?"

"Very astute, Katie. Yes, I was just about getting to that. Do you know Rita?"

"The short Latina receptionist with the huge tits?"

"I guess that's one way to put it, yeah. Anyway, Rita apparently found Kim's panties and decided to do something about it."

"No way," Katie exclaimed. "Rita's such a curvy goddess! What happened?"

I told the story of how I ended up buried in Rita's ass while Kim got a load of girl-cum on her face, and how Kim was both insanely jealous and insanely turned on. As I told the story, I saw Katie crossing and uncrossing her legs, pressing her thighs together like she was trying to scratch a subtle but deep itch. I went on to describe how Kim had licked my cum off of Rita's ass and pussy.

"Fuck," Katie moaned as she pressed her hand onto her mound, cupping her sex through her shorts. "I'm so insanely jealous of Rita right now. I want to try anal sex."

"You've never done it?" I ask. "Really? Really?" My tone carried my skepticism.

"Fuck you, Rog! I'm not as experienced as you think. I've given some blow jobs and had sex a few times."

"And 69'ed your sister," I reminded her.

"Yes, and I 69'ed my sister," she agreed. "But I've never had anal sex. Some guy put a finger in my ass once while we were fucking, but that's it. I think I can take it, though. Care to try?"

"No way!" I said, perhaps a bit too eager to turn Katie down. She looked a tad hurt.

"Why not? You fucked Rita and Kim was cool with that. Let's mess around and see what it leads to. Maybe a finger in there, maybe two, maybe that big cock of yours." Katie reached over to squeeze my dick through my pants, her fingers insistent as they firmly but seductively ran up and down my cock. I pulled her hand away.

"No. Kim is still weird about the two of you hooking up. There's no way she'd want me to fuck you."

"Don't fuck me," Katie replied, using air quotes around the word "fuck." "Just mess around and do what you did with Rita."

"No. First, Rita was clearly experienced with anal sex. It's not for everyone. Second, I have a plan if you could settle down for a hot minute and listen. Deal?" I ask.

"Fine, but it better be good."

"I think it is. So we have a deal?"

"Deal. What's your plan?" She asks.

"Tell me about your friends..."

*************************************************************************************************************

Over the next week, which was busy for both Kim and I at our jobs (which was unfortunately becoming the norm), I saw Katie very little. She was especially provocative when I was around her, though. Not in an over the top sultry way, though. I think she was learning that I prefer a subtle actress to an over-the-top, dramatic one. In that vein, Katie was coy about her efforts to keep my attention and, I think, to push Kim's buttons just a bit. For example, Katie was always sure to wear loose fitting shorts and bright colored panties to draw attention to her plump ass and smooth thighs. She would lay back and spread her legs wide as she read on the couch, and her panties were clearly visible on one side every time.

Finally, Kim and I had a free Saturday to spend together once she finished a work project early Saturday morning. I was out in the living room watching a college football pregame show when Katie glided into the room, still a bit disheveled from a night out with her friends the night before.

"What time did you get home last night?" I asked as she frumped onto the couch. Her hair was a mess, her t-shirt was inside out, and her ass was barely covered by the shirt. It was clear that Katie wasn't wearing a bra, not that it made her tits sag at all. Those pert breasts wouldn't last forever, but for now they're high beams all the time.

"I think one or so? Lisa had a joint, and I made Amber smoke for the first time. But we had a good time, just kind of hanging out. And talking. I found out a lot of things about them."

"Oh?" I asked, eager to find out more. "What did you find out."

"Nothing I can share yet, Rog, but we just had some good chats."

"Fine, gives me something to look forward to." I replied.

Katie sort of slowly fell sideways into a sleeping position, her face buried in the corner between the seat and the back. "Okay, good, going to sleep now so try not to make too much noise," she stated into the couch, her voice muffled. Katie shifted her body a bit, pulling her knees up some and rolling halfway onto her left side, with her right hip up in the air. She wiggled her butt a few times to get settled in.

I ran my gaze over her white socks, pulled halfway up her calf to reveal two green stripes on each. I traced my eyes over her knees and started moving up the back of her smooth thighs. As I approached the "V" where her thighs meet up, I saw her pink cotton panties pulled up tight into her vulva. The fabric barely contained her plump lips, then continued up to barely cover her little asshole before framing her 18 year old ass cheeks. Her back arched in, disappearing under her t-shirt but only after exposing a little tramp stamp, a pair of dragon wings extending from her spine to her sides. I wondered why I never really noticed that before.

I turned back to the pregame show, waiting for Kim to finish up so we could finally get out for a date. Lunch and a movie, maybe some drinks. Just a simple date to reconnect and relax.

"And maybe we'll get a little frisky with some role play while we're out," I thought. "Maybe we could role play that Kim was Katie? Nah, she's not ready for that yet, I don't think."

I turn my eyes back to Katie. Immediately, I notice that her panties have shifted to the side, revealing a single pussy lip and teasing a hint of more pink underneath. Just then, Kim walks out.

"I'm done!" She says excitedly.

"Shh!" I admonish her, perhaps a bit too harshly. "Katie's sleeping."

"Oh, fuck her, it's almost noon. Time for her to get up." Kim comes around the couch intent on waking Katie up. Katie, astonishingly, hasn't moved a muscle. Kim looks down and immediately notices that her sister's pussy is partly hanging out. Kim gives me a look. I can't tell if she's mad or just annoyed, but she seems a tad upset.

Kim dives onto Katie, startling her younger sister out of sleep. "Wake up, sleepy!" Kim starts to tickle Katie, her hands digging into Katie's rib cage.

Katie struggles fiercely. "Ah, stop it, Kim! Stop it!" Katie is thrashing about, trying to get her older sister off of her. Kim's right hand is pushed down off of Katie's ribs. Kim quickly moves it to Katie's right hip, her fingers finding ticklish spots on Katie's upper thighs and hip bone.

Kim is tickling Katie, who giggles non-stop as she tries to escape. "You're sleeping at noon with your pussy out, Katie! Haven't you given Roger enough shows?"

"No," I think to myself. "No, she has not."

Kim starts to get up, satisfied with her victory over her 18 year old sister.

"Afraid Roger can't resist this ass?" Katie teases with a little wiggle.

Kim pounces again, this time with her knee on Katie's back. Katie is helplessly pinned, and Kim takes full advantage. Whap! Kim's right hand smacks across Katie's plump ass, her cheeks jiggling from the impact. Smack! Kim's hand comes down. Katie yelps in pain, clearly shocked by Kim's abrupt spanking.

"You're a bad girl, Katie. Quit parading around half-naked." Kim seems genuinely pissed off. She looks over at me. "Ready to go?" I nod, despondent that our date night has started out with such a weird tone. We hop in the SUV and drive through the rain to our spot.

We arrive at the restaurant, a favorite tavern of ours with great craft cocktails and good enough food to stay for the drinks. It's relatively empty, likely due to the weather. We get a round booth in the back and slide next to each other. We've always like sitting next to each other rather than across, or at least we did when we first started dating. Nowadays we usually just take what we can get. It was nice to feel her hip bump into mine as she settled in.

Kim and I ordered some tequila based drinks to start. I like spicy drinks, she likes the sweeter kind. We caught up on our week and had the sort of natural, easy conversation we'd use to have when we weren't so caught up with our careers. It was only a couple of years ago, but it felt like a lifetime. Kim was flirty. Her hand would subtlety touch me on my hands, leg, or cheek. Her hip and thigh rubbed against me firmly and slowly. She cocked her head in interest (sincere or feigned, I don't know) at my stories, exposing her long, graceful neck. Her dress was a sort of long, fitted sweater with tiny little "sleeves" and a folded over mock turtle collar. It stopped halfway down her thigh.

Our waitress stopped by again. She (Ellen) was cute in a sort of punky, youthful way. Ellen had a lithe build and a pixie cut with faded streaks of pink on a black canvas. Her big doe eyes revealed that she was likely a pleaser type of personality. A real people person. At least that's what I wanted to believe.

"Ellen, we haven't had a proper date in almost a month. What would you recommend for a couple of young lovers like us?" I always enjoyed flirting with bartenders and waitresses in front of Kim. I felt a bit lewd (and certainly rude) in doing it, but for some reason Kim's half-disgusted / half-enjoying-it reaction made me eager to push boundaries with every cute waitress we meet. And in Las Vegas, there are plenty of those to go around.

"Another round of drinks, something light, and a quick check?" Ellen remarked smartly. Well played, Ellen.

"Well, then, let's get another round of drinks and some lettuce wraps. Babe, you want anything else from Ellen?" I asked Kim.

"What, no, I'm fine, thanks," Kim replied a bit distractedly. She looked up. "Thanks, Ellen, that's good advice." I guess Kim was paying attention after all.

As Ellen shuttled off, Kim turned to me. "You know, Roger, we haven't had a date like this in a while. It really takes me back when you flirt with waitresses in front of me. You know, like an asshole."

"Had I gone too far?" I wondered. "Is she really mad?" My eyes betrayed my confusion.

Suddenly, Kim burst out laughing. "Did I really have you? You're so gullible!" Kim's laughter was filled with self-satisfaction.

"You really did. I thought you were pissed." I was stunned. Subterfuge is not Kim's strong suit.

"Roger, you got blown by my sister and fucked my secretary in the ass. I think flirting with a cute waitress is not going to ruffle my feathers." Kim replied, perhaps a bit louder than was prudent.

"I suppose so, but you've been a bit awkward about things."

"I'm just working through it all. It was great in the moment, but not sure how I feel about it long term. Sometimes when I'm at work, though, I can't help but think about how hot it was when you were railing Rita's fat ass with your dick."

"It was memorable," I replied, understatement dripping from my voice.

"Yeah. Maybe we can do something again sometime, but I'd like to just keep it to me and you for now if that's all right."

"Fine by me," I say, but I'm secretly a little disappointed.

"But that doesn't mean we can't make our own fun," Kim replied, her fingers walking across the top of my right leg and onto my crotch. Kim began to rub me through my pants. "I don't want to do anything with anyone else right now. But we can fantasize about it." Kim bit her lip, looking at me for approval.

"Yes, that's a great idea," I confirmed. Kim looked relieved, and her lip biting went from nervous to sultry with the bat of an eye. Sensing we were in a safe place for Kim, I decided to take control over the situation. I turned to Kim and looked her directly in the eyes. I reached up and tilted her chin up with my left hand. "What color panties do you think Ellen is wearing?" I asked her, my eyes never leaving hers.

"Oh," she shuddered, her reaction a confirmation of what I already knew: Kim loves panties. "Mmmm, I don't know, Sir, what do you think?"

"Green bikinis, maybe?" I tease, letting the image linger in her mind. "Or blue boy shorts? Or maybe a pink thong like Katie..."

"She's such a little tease, Roger!" Kim suddenly interrupted at the sound of her sister's name. "I know you saw her pussy hanging out and..."

I decided to cut off her whining. "Do you think Ellen's pussy is hanging out?"

"Mmmm, yeah." Kim closed her eyes briefly, imagining Ellen's panties askew between her thighs.

Kim opened her eyes to Ellen walking over with our second round of drinks and our lettuce wraps. We both oogled her fairly openly; if she minded she didn't let on. I placed my hand high enough on Kim's thigh that I could feel the heat from her crotch. My fingers traced the inside of her thighs suggestively. Ellen could clearly see that I was roughly kneading Kim's thigh.