Jules began riding me very slowly again, almost like she was trying to be discrete about it...like that was possible. The slowness of her motion though was driving me wild. The muscles of her pussy were clamped tight around my shaft and the feeling as she slowly moved up and down it's length was unreal. It also offered a perfect view of our fucking, her lips wrapped tightly around my rigid shaft and her clit hard and protruding from her hood. Our eyes remained locked, trying to gauge each other's reaction to Aunt Sam catching us.
"She seems ok with this," Jules whispered to me.
"Yah, she does. I doubt she would have gotten naked if she hadn't been ok with it."
"True...Fuck, your cock feels good. I want to totally let go, but...I know what she said and all, but...it just is such a fucking weird scene, you know?"
"I hear ya, but think about it sis, she could have stayed hidden and just watched. Instead she walked down here and then got naked. I think she's actually totally cool with it. And I bet she's turned on too."
This had the effect of making Jules relax a little more and she began to increase her rhythm, riding the full length of my shaft with an increasing pace. I looked around Jules and could see that Aunt Sam had turned away from the waterfall and was swimming back in our direction, her eyes clearly on us.
The whole scene had me seriously turned on. My hot sister was riding my cock and our Aunt was watching us do it, now less than 10 feet away. And I could tell Jules was getting wound up too, her hips beginning to gyrate as her pace increased, and the concern that was visible in her face only a minute before had been replaced by a mask of pure, carnal lust. And beyond that, it was pretty obvious she was really getting into my cock. She had told me I was the biggest cock she had ever seen, which made it the biggest cock she had ever fucked and she was making the most of it.
Suddenly, I felt something rub against my balls. I looked around Jules and Aunt Sam was right behind us and she had reached up and was caressing my balls as Jules rode my cock. Jules' back suddenly arched and her head whipped around as she felt Aunt Sam's other hand run down her back.
"If you want me to leave you two alone, I will, but I just couldn't help myself. Seeing you take Tom's massive cock with your petite build is probably the most erotic thing I've ever seen. I just wanted to feel your sexual energy."
"We don't mind. Enjoy us all you want," Jules said in a breathy voice, speaking for both of us..."You're fucking hot too."
And the next moment, they were kissing. I couldn't believe what I was seeing. Aunt Sam had brought her left hand up and around Jules' neck and pulled her into a passionate kiss, their tongues swirling together. Her right hand moved to Jules' left breast, which she gently massaged, and then rolled Jules' nipple between her thumb and index finger.
As Jules' continued riding me and they continued kissing, Aunt Sam's hand slowly drifted down from Jules' breast to her stomach and lower, her fingers opening into a V as the slid over Jules' pussy and around either side of my cock. OMG...Aunt Sam was feeling us fuck, feeling the length of my cock slide in and out of Jules' sopping wet pussy. She then pulled her hand up, resting her middle finger on Jules' exposed clit and began to rub it, eliciting a loud whimper and causing her entire body to buck.
In panting breaths, Jules pulled back from the kiss and begged, "Oh yes...fuck, fuck yes...play with my fucking clit...oh fuck, oh fuck. Fuck me Tom...fuck me Tom...let Aunt Sam see you fuck me."
Jules' breathes were rapid pants and I could tell she was on the verge of totally exploding. For that matter, so was I, every nerve in my cock beginning to fire as I felt the orgasmic sensation of my cum rising out of my balls.
Jules' was moaning loudly...not just moaning, but screaming, her cries of pleasure consumed by the surrounding forest as I felt the muscles of her pussy clamp down on my cock. Aunt Sam was furiously rubbing her clit with two fingers and with another scream, Jules' and I came simultaneously, my cock shooting heavy streams of cum deep into her pussy as she responded in turn, drenching me and Aunt Sam's hand with gushes of hot liquid as she arched her back and threw back her head.