After a couple hundred feet we climbed up the western slope of the ravine. The wall was only fifty feet high and we both climbed it without any proble...ms."We'll need to keep quiet," I told Nimue as we neared the top of the slope. "While the jammers will keep the security robots from detecting us unless they stumble over us, there is always the possibility that someone human might be about and our voices might carry."Nimue nodded her understanding. With that said we moved up to the very edge of. She almost forgets about the tether, which is tightening like an overstretched rubber band.The man moans and thrusts his hips up each time he yanks her down. "Oh God ... I'm going to love ... watching you struggle ... against the ropes while ... I fuck your brains out ... over and over..."Cassie arches her back as her pussy soars and strains at the edge, and her tether seems to strain along with it. She holds back the latter, forcing herself to do her duty, to push her endurance as far as it. I could feel the thick head penetrating my wet lips. I struggled but then surprisingly my mouth surrendered and I could feel his hard rock shaft move into my mouth…He made me gag as he pushed his dick deep into my throat. I could feel his strong hands on the back of my head firmly guiding me back and forth. He also made me practically fell out of my seat and ended up on my knees…“That’s it, slut; you found the rhythm. Now take it deep inside” He said.I let out a choking noise, but his strong. "They were cute. I can't believe they stopped to look at us!"I laughed at her. "Oh my God, of course they did. Guys have like Nikki-boob radar!"Nikki blushed but she didn't deny it.We drifted a little further. Our cabins were on a private inlet that dipped in for about a mile, but the bigger lake was a lot more crowded. It was a Saturday, so there were lots of motorboaters out for the weekend with all kinds of people in them. We saw a couple of other canoes, but mostly they were all lots.