Stacy shares her sister with me

My cousin Stacy settled into life around my house quite well. She helped with the house work and spent time catching up with her old friends. They had no idea of her new “job” and Stacy didn’t let them in on her secret lifestyle.
I spent my nights with Stacy in my bed as we soon fell into a pattern of fucking and fondling for hours on end. The things that Stacy could do with her pussy and mouth should be taught to all new wives and willing girlfriends. She had a blow job method that is hard to believe. She would swallow my cock all the way down her throat, then slid her tongue out and lick my balls. The first time she used that method on me, I blew my load instantly and did my best to drown her with the amount cum sent down her throat. Because of Stacy’s many talents, my 43 year old cock had the habit of staying hard and doing it’s best to keep her tight 25 year old body happy. I must have done something right over the 1st month of her stay with me, because one day I came home to a surprise.
One Friday afternoon, I came home and Stacy had company at the house. It was her 18 year old sister Shelby. Shelby was a sexy little pixy that was about 5’2″ and all of 100 pounds. She has long curly light brown hair, B-cup tits, a slender pair of hips and an ass that was no wider than 13″ across. To see her in a tight jeans skirt made me dream of grabbing those hips and pumping my cock in her until I passed out. The tight halter top she wore showed off her tight little body and allowed a good look at her teenaged tits. She wasn’t wearing a bra, so her nipples and small swollen areolas could clearly be seen. Shelby’s outfit had “fuck me hard” written all over it and I wanted to tear her clothes off right there and do her until the sun came up. Keeping my rising erection hidden wasn’t going to be easy.
After catching up with Shelby and having some dinner with her and Stacy, we settled down in the livingroom to watch a movie and hang out. I was sitting next to Stacy with Shelby on the other side of me. As the movie went along, Stacy leaned over and started snuggling in under my arm and laid her head on my chest. I knew she had told her sister about our sexual relationship but I wasn’t really sure how Shelby felt about her Uncle fucking her sister. As Stacy made herself comfy against my chest, I wrapped my arm over her shoulder and rubbed her tit with my hand until I felt her nipple grow hard under her shirt. As I rubbed her nipple, she slowly ran her hand up and down my thigh and making my cock stir.
At that time Stacy looked up at me and said “Shelby has a favor to ask of you”. I look at Shelby as she turned to me and said “Uncle, would you please make love to me and show me what its like to be a woman?” “Stacy has told me about her “Job” and the money she makes, and I want to see if I could be an escort too.” I was shocked to say the least. To hear my little cousin say she wanted to be a high priced call girl like her sister, and want me to show her the way, had me in a daze. I stammered and stuttered but managed to ask her “Are you sure you want to do this Shelby? Do you know what it means if you and I do this?” Shelby answered “Yes I realize what it means and Stacy said you would be a good person to try this out with. If I can fuck my Uncle then fucking a stranger for money shouldn’t be too hard to do.” After looking into her eyes and seeing her determination to go thru with it, I agree to help her out. Inside I was doing back flips at the thought of fucking her tiny little body, but I was worried I might be sending her down a path she would later regret.
After agreeing to help Shelby with her “job training”, she moved closer to me placing her hand on my crotch while giving me a kiss on the lips. With one hand on Stacy’s tit I used my other hand to grab Shelby’s neck and pull her lips tightly into my mouth. As our lips pressed together, I feel her tongue dart out of her mouth and slide into mine as she tried to play tonsil hockey with me. While doing our best to swallow each other’s tongues, I felt her unzip my pants and slide her hand inside my jeans where she grabbed hold of my quickly hardening cock and started to slowly rub it while fondling my balls in-between strokes. All this attention is getting my blood hot and I soon removed my hand from Stacy’s tit to focus on Shelby’s tight frame. I reached over with one hand and grabbed her ass while pulling her up into my lap. Once straddling my waist, I grabbed hold of her halter top and pulled it up over her head, exposing her perfect little tits for my mouth. Her tits where the size of baseballs with light brown areolas the size of quarters surrounding small dark red nipples sticking out about 1/4″. I took one of her tits and did my best to suck the whole thing into my mouth. As I sucked and licked her tits, Shelby let out a soft purr and ran her hands thru my hair pulling my head into her chest. Sucking on Shelby’s firm, tender tits had the effect of making my cock hard as iron and it desperately wanted to get inside her hot little holes.

As my cock strained to feel tight depths of Shelby’s body, I continued to lick and suck on her taunt tanned tits while running my hands up and down her slim body. Sensing my cock’s growing need for some attention, Shelby slid down my lap until she was kneeling between my legs. She reached up and un buckled my belt, opened my jeans, and slid them down to my ankles.