My excitement was so great that I never lost my erection. I told her we should go into the shower together and try to get Linda to join in so there would be no problem later as I wanted this relationship to continue throughout the vacation and beyond if possible. Kate agreed and we decided not to tell Linda what had already transpired until we were sure of the outcome. I knew Linda would not be suspicious if I walked in with a still hard dick as she would never suspect I had just drained my balls in her sisters mouth.
Kate and I walked into the bathroom and surprised Linda who was almost done with her shower she looked at both of us and had a slight frown on her face. I moved to Linda and pulled her to me making sure to rub my hot stiff cock into her belly. I told her Kate and I had gotten tired of waiting for her to finish and since we all planned to go to the nude beach together I saw no reason why we shouldn't strip and shower with her. Linda was still a bit suspicious but the fact that my stiff cock was pressed up against her taught belly convinced her that nothing had gone on.
Linda pulled back and asked me to soap her up again, I grabbed the soap and rubbed it into her full tits noticing that her nipples had hardened even before I started to fondle her tits. I turned her around to face her sister Kate who had turned on the other shower head and was wetting herself down. Kate looked on with lust as I rubbed Linda's tits with the soap and ground my hard cock into her firm ass cheeks. I rubbed down her belly and moved in between her legs making sure to spread them so her sister would see Linda's nicely shaved pink lips. I could tell Kate was getting excited again as her nipples began to harden even under the hot water following over her smooth firm breasts. I worked Linda's pussy until I sensed that she was very worked up and then turned her around to face me and kissed her while I rubbed her firm ass cheeks soaping them and spreading them open so Kate could get a good look at her sisters ass. Linda was beginning to really get hot now and she reached down and pushed my cock between her legs forcing my prick to saw back and forth between her slippery pussy lips.
Kate licked her lips and reaching between her legs slipped two fingers into her own pussy and started to masturbate. Sensing that Linda was ready for a good fucking I turned her around and placed her hands on the wall as I pressed against her slippery ass and fondled her full firm tits. She looked over and saw her sister Kate fingering herself and began to wiggle her ass letting me know that she wanted me to fuck her. I grabbed Linda's hips and pulled her into position, spreading her ass cheeks I forced my stiff cock into her hot wet pussy as her sister watched and finger fucked her own hot vagina. I began to pump Linda in earnest now and her moans and squeals filled the shower as her passion grew with each of my deep hard thrusts. The lather was running between Linda's ass cheeks and her rear was good and wet so I pressed my thumb up her ass to further stimulate her lust.
Linda never took her eyes off her sister even as she began to climax. As her first orgasm was finishing up I motioned to Kate to join us and Kate came over and rubbed her crotch into my leg as I continued to stroke in and out of my wifes hot pussy. I grabbed Kate's hand and placed it on Linda's tit and Linda moaned deeply then begged her sister to lick and suck her tits. While I was a bit surprised at her sudden lust for her sister I was too turned on to do much except fuck Linda's cunt harder. Kate quickly began to suck Linda's firm tits and reached between Linda's legs to finger her stiff clit as I continued to ram my throbbing meat into Linda's slick pussy. Kate got on her knees and pressed her face into her sisters cunt licking Linda's clit while I probed her cunt with my long stiff cock. This combination made Linda climax again and her pussy convulsed around my cock milking my sperm into her hot twitching vagina. Kate licked up our overflow and got up and kissed her sister sharing the juices she had licked up as I gently ground my cock into my wife's cunt and fondled her tits.
Linda looked at Kate and I and thanked us for a fabulous fucking, and pushed Kate to me telling me she wanted to see her sister get her share. I turned Kate to face my wife and put my arms around her rubbing her tits and pulling on Kate's stiff nipples as I pressed my cock into Kate's firm ass cheeks. My wife Linda watched as I rubbed her sisters tits and spread her legs and began to rub her pussy opening her lips and rubbing her erect clit. As I slipped my fingers into Kate's wet hot slit Linda began to finger fuck her own cum slickened cunt. Kate who had been silent up to now began to moan as I probed her hot wet slit and rubbed her stiff clit.