There is a wide spiraling screw thread running diagonally along its surface to engage the ring of muscle at the entrance of the anus. The crank on the...end permits the operator to rotate the device, with the net result that it actually screws into the recipient. The net result is to gently but inexorably enlarge and loosen the anal sphincter. For our first session, we will content ourself with a modest gain in aperture." Screwed by a corkscrew," Vic was thinking as Mistress Domina introduced the. She had to lift the duvet a bit more and moved it down to get to the bottle and I made sure that she exposed the top of my penis, which is always very, very engorged. She went into the bathroom and got a bowl with my toiletries in it, and put it on the floor adjacent to my feet. Her skirt rode up, as she bent over to do this, and I saw the bottom side of her, tanned, left ass cheek. (She has a nice ass.) G-string, I thought, as my penis went harder. She disappeared to get another bowl of water. ‘What? What is it?’‘Trust us. just accept the idea’ So I did.That night I was allowed to fall asleep. Avril had established herself in my bed again, and Alkena was making sure that she got nothing extra, so she was lying on the other side of me. I told them both that I wanted to sleep. It didn’t stop them deliberately leaving off any bedtime attire, just in case. I confess I was tempted with Alkena; I was tempted with both, but I was determined to keep strictly to my resolve that Avril’s tight. It was one thing to read about things in brochures it was a completely different thing to see it first hand. Moving along the path the girls had seen several fully naked girls walk by but now they were seeing a vast auditorium of them. As for Stephen ... if he loved watching Presenting Classes then he loved even more watching the beautiful girls of BSC working out totally naked in the gymnasium.The gymnasium was full of beautiful nude girls from BSC’s various cheer leading squads. Tits.