I could hear her muffled moan as my fingers worked their magic on her pussy. I proceeded to pull her pants and thong off as we got into 69 position. H...r pussy tasted wonderful, smelled amazing, and was shaved, exposing her smooth milky-white skin to my hungry tongue. I was even more amazed that such a hot girl was a virgin and was tempted to fuck her, but I realized I didn't have a condom and didn't want to get her knocked up accidentally. So instead, I found her clitoris and attacked that with. This went on for another five or minutes, and then, they stopped and rolled over on their stomachs and laid out tanning. Tom and I looked at one another, like, what the hell.About an hour into the trip, I looked back, then nudged Tom to turn around. The girls were completely naked, and locked into a 69 position. Both going to town on each other. Tom got up and took his phone and snapped some shots of this. We both were getting hard just watching them.Cathy looked up at us and winked, then. She was speechless. I just said "you were so fucking hot Katie..." and I rolled on top of her to start kissing her again. Her skin was still damp from the sweat of her workout. Eventually my hands made their way down to her panties and she grabbed my wrists to stop me. Without saying anything she just gave me an embarrassed shake of her head as if to say "you shouldn't do that". I just said "Please... I want it..." and after she took a deep breath, her hands loosened their grip.Sliding Katie's. Yet I added her screenname to my new screen name's "buddy list" and continued to "spy" on Rocy, out of an enduring curiosity.Naturally, I began to feel very guilty and hypocritical, as she continued from that first conversation to appear in various chat rooms, including the ones already mentioned and others on similar themes. Perhaps the most surprising was one time I "caught" her in a room called "dau no bra" - which made me wonder, indeed, what kind of fantasy life my "innocent" niece.