Her sister's back door kink

She was by no means a girl friend. Cindy. We worked together. I was 25 she was 20. I was a supervisor, in a small department at a midwestern University. Great worker, She worked part time, a sophomore in college. Really smart. Just, more mature than her age. When I gave her a job, she got it done. She was really going to be a life success. I knew nothing about her personal life, other than she lived in a small local apartment, and took a bus to class and to work.

Besides being more mature than her co workers, she was also really good looking. Sexy without trying too hard. About 5-7, very athletic, you could tell she must work out. Just, tight everywhere. Longer dark hair, her boobs were, well, not huge, but, you definitely looked. And she wore these blouses that somehow emphasized those attributes. Not fuck me blouses, but, just low enough, just tight enough. And her ass... yes. Again, her pants, or shorts, or dresses, were, seductively tight, just enough to make a guy's, and a couple of the girl's eyes linger. Flirty, not dirty.

One day, a Friday, she was telling one of the other girls that her mother was coming to town, her father was on some business trip, so mom was coming to visit. Cindy was trying to figure out the bus route to get to her motel. My first mistake, I volunteered to give her a ride, she was thrilled, gave me a big hug, in front of the other female employees. We discussed it, I would be there at 8, we could go out for breakfast, her treat, then head to see her mom. After we picked up her sister. Oh, a sister. "Wait til you meet my sister, and my mom is going to love you". Oh, okay.

Saturday morning, I got there about 8, knocked, she opened the door after a long wait, in this, well, just about a fuck me nightie. Sheer, white, left very little to the imagination. Quite obvious she wasn't wearing a bra, the nightie was low cut, and gave me a good view of her breasts, my guess was a C cup. I couldn't tell, but, looking at that ass, I didn't think I saw panties. Maybe panties.

"Oh my god, I overslept, I'm so sorry, and, I thought you were my sister. I'm...this nightie, I uh, what time is it?" I told her it was eight, she hugged me, "I'm so sorry thanks so much for coming. Come, want some coffee, we were going to go out, but, I obviously overslept. I have some cinnamon rolls, how about cinnamon rolls and coffee?" I said sure, she led me to her kitchen. I sat while she fixed coffee. I was staring at that ass as she made the coffee and got rolls out of the fridge. I felt that all too rare bulge in my pants.

She brought me coffee, sugar, creamer, and as she put it in front of me, bent over, gave me a full out view of her breasts. I stared, my crotch tightening. "Ohhh god I am, I am, damn, sorry I'm not used to having guys over dressed in my favorite nightie. Well, okay, I guess you have seen them. It'ss okay you don't have to be anymore embarrassed than I am. You have seen my boobs, no more boobie secrets. They are what they are."

"They are,,,fabulous. I can't believe I said that to you, a co worker. But, yeah, fabulous. Wear that nightie any time." She glanced down, at my crotch. I was definitely showing. "Well, looks like you didn't mind, after all. It's a compliment, I mean, what if you looked and didn't admire them. I will try not to , well, let me go change, oh, I haven't showered yet! Damn. And my sister..." just as the front door opened. Impossible, two women this stunning in one family.

Cindy hugged her sister, all I could think about was those breasts against her sister's breasts. Cindy introduced me "Hi Diane, this is Rob, we work together. He is taking me over to see mom, you wanna ride with us?" Her sister came forward, hugged me, way too long, But I wasn't going to say no.

"We are huggers, the whole family is, get used to it. Ohhhh this is him huh? Dressed in that nightie, I am guessing he is more than a co worker, huh? Congratulations, great catch. " She also glanced at my crotch. "Oh yes, Cin, that nightie is definitely working." They laughed. What could I say, two stunningly sexy sisters, one in a fuck me nightie, the other pressing her boobs against me. Boobs barely again concealed in a low cut, midriff showing top, and gym shorts painted on.

"You will get used to us Rob, we definitely aren't a shy family. At least, the female side isn't. Di is kind of into both sides of the aisle, so if she thinks you are a keeper, be careful".

Cin took my hand, surprisingly. I wondered if she was trying to show her sister that I was taken. Well, I wasn't taken, this wasn't even a date. As I looked, quickly at her sister's glued on gym shorts. Another great ass. Bigger than Cindy's ass, just, oh so inviting.

"You two, I have to shower, he obviously likes you, Di, why don't you entertain him while I get naked and do a quickie... shower. I have some clothes in the bedroom on the bed, you two pick out something I can wear. I told mom I was bringing a friend. A guy friend. Anyway, you two, see you in a bit, Di, don't let him get bored." She winked at us. Huh? God I was naive.

Cindy headed to the bathroom to shower. "You love her ass don't you. Tight one, isn't it. Mine isn't that tight, more...well, you admired mine too. Listen, we have like, just a few minutes. She told me to entertain you. She is going to be in there for a few minutes. Drop those pants, take that shirt off, get naked. You like my ass? I'm telling you, we don't have time for you to eat me and make me cum, but we have time for you to use my other hole, if you don't mind, filling my ass. Is that a yes?"

I was in shock. Did they plan this, I hadn't even kissed her sister, and here she was telling me to fuck her ass while her sister showered. And, seemed like a set up to me. I didn't hesitate. Diane grabbed some conveniently placed lube, stared at my hard cock. I stared at her...everything. "Ohhh baby, I love a cock like that, kinda long, not too thick to fit...here..." She squirted some lube, gave me a quickie handjob, I would call it, applying lube to my cock, and bent over, told me to lube her ass, finger her, one, then two, then fuck her. I put in one finger, she moaned, then two, louder.

I stepped forward. grabbed her hips. "Your sister is okay with this, me fucking you while she showers? I mean, I don't want any jealousy, any problems." I poked that ass with my hard cock. I was going to fuck her anyway, no matter what, now. "Honey, you have like three minutes, she will be out, unless you want her to watch, put that thing in me, You fuck me, I will use my hands on my own clit. Go for it,,,I'm soo fucking ready for that cock."

I did, I slid in she moaned, I moaned, entered slowly, "Yes, more more" I pushed forward she moaned, her hand now rubbing her slit. "Honey, just fuck me, I love it there, I don't fuck guys very often but when I do, thiis is my thing. Go for it, hurry." I did, I really just, frankly, went for it. It was all about me, not her, quite selfish. Her ass, her sister a few feet away, naked, showering, was she thinking of me fucking her sister?

She moaned, I moaned, I wondered what the neighbors were thinking. Could Cindy hear us fucking? What a turn on. "Go for it baby fuck my hot needy ass. Cum in me fill me up with your cum." she moaned. I did, embarrassingly quickly. One big load as I pulled her ass toward me, another another. Oh god yes. I was in heaven. I realized, I had totally forgotten about a rubber. But, she wasn't gonna get pregnant from my cum in her ass. I was just about to pull out...

"Ohhh you two did get busy. You certainly did entertain him, sister!" Cindy had come into the room, this time, totally naked. Oh fuck yes. "Diane you ass slut, his cum is dripping out of your ass. Go clean up, we don't need mom seeing his cum running out of your fine ass."

"Well, mom is gonna know it anyway, I will try to pretend we hadn't fucked, yet." they laughed. "Oh, just to tell you, mom is a super hugger, but if she likes you she will kiss you, maybe on the cheek, maybe, a quickie on the lips, don't be shocked. Face it, Rob, you are family now. And, we are a close family, at least the girls are. Mom can be...flirty. For 40, you are gonna think how fuckable she is. Hurry, wipe his cum, let's get dressed, mom is waiting."