Without batting an eye and just as natural as I could be I got out of the truck and helped hubby set up camp. First pitching the tent and then setting...up the rest of camp. Yes my nudity was attracting quiet a bit of attention but no one was brave enough to say anything.Once the campsite was set up we entered the tent for an afternoon delight. We left the door and window flaps open as hubby and I had intercourse in numberous positions putting on a nice show for those campers who kept walking by. Gloria looked back at me and shouted, “What to fuck are you doing? Get that thing out of me. Now!”Rachael had her in a bear hug and Gloria could not get loose. Then Rachael shouted, “What to hell do you think he’s doing? He’s taking your virginity. He’ll be getting mine in a few minutes so relax and enjoy it.”My sister was a virgin! So was I but after this neither one of us would be. Wow! Who would have thought that I would loose my virginity in my own sister?Gloria started to relax and she. At the base of his ten inch cock, a ball was forming. With each stroke he pushed it harder into Molly. He griped her hips tighter and slammed furiously into her drenched cunt. Two more lunges and the growing knot disappeared inside Molly. She gasped, screaming from pain and unknown pleasure as she felt the big ball lock inside her cunt. She could feel his already huge cock being to swell, and suddenly felt the gush of dog cum explode into her cunt. She screamed out in pleasure, again erupting. As we dried off with my only clean towel, I suggested we go to the Union for breakfast. She nodded agreement, then came up to me and looked in my eyes. She put her arms around my neck and kissed me. Lightly at first, then more intimately, with tongue. She stared deeply into my eyes, first one then the other. I didn’t know what to say. She finally broke the sensuous silence. ‘Before we go… will you make love to me again?’ ‘Now?’ She nodded. ‘But Heather… why? I mean, I want to make love to.