I'm going to quote the part of the story that describes what happens next, even though it might be a bit much. This would have been a rough draft, not a finished part of the story, but I don't intend to go back and polish it now. For those who aren't familiar with the story, Hercules is the Nubian holding Sabina's buttocks and legs, Ajax is the one tying her right ankle, and Antius is the one with the hammer. Anyway, here's the passage:
I felt Hercules adjust his stance, then his right hand, which had been gripping my buttocks, moved and slid up between my wide-spread legs from behind and took hold of my porcella. I jerked my head down to look, saw only his fingertips curling up around my abdomen from below. I let out a sigh. He had me, and there was nothing I could do about it.
He gave my porcella a hard squeeze, then I felt one of his fingertips curl around, sliding down the length of my cleft, probing and feeling as it went until it came to the deeper place at the entrance to my vagina. I knew what was coming.
My buttocks clenched instinctively, protectively. Uselessly. I gasped, then let my breath out in a moan, helpless, straining as if there were anything I could do to keep him out of me.
I felt his rough, dry fingertip move deeper, find my warm wetness, and push its way into me, making me squirm my hips, try to push back. “Ohhh!” I moaned, and everyone watching saw what he was doing to me, heard my tone of fear and defeat, saw me staring wide-eyed down at my crotch, and laughed. I was so humiliated!
I expected something like this, knew I’d be violated somehow, before… I thought. They can do anything they want to me. My body belongs to them, now, not to me.
“Io, Ajax, this girl’s cunnus is tight as a gnat’s ass! And that’s just on my finger! Whoo! Feel her squirm! Stick your cock in this and she’d milk it like a cow’s teat!” Hercules laughed.
Ajax joined in laughing. “What a shame we didn’t get to try her out last night! Now we’ll never find out! You should check her asshole, bet it’s squeezed so tight about now that Antius couldn’t even drive a nail up inside it!”
Despite my misery and humiliation, the revolting feeling of Hercules’ finger inside of me, I was aware of what Antius was doing. Even though the two Nubians were holding me, violating me, roping my feet, Antius was the man with the hammer. Antius was the one who had driven nails through my wrists and was going to drive the nails through my feet, too. No matter what these others did to me, I always wanted to know where he was and what he was doing, or about to do to me.
I saw him standing to my right side, reaching behind my back to work between me and the cross. I could see his movement, feel every tap of his hammer. I knew what he was doing, had seen it all before. He was setting the cornu in place in its socket, its horn pointing up, fitting the wedge in underneath it. I felt his tapping through the nails in my throbbing wrists, small shocks where rough iron met bone, my tense body jerking with each one.
Hercules laughed again. “Her cunnus clamps down on my finger every time Antius taps with his hammer!”
The crowd laughed at that. A woman shouted, “Better be glad she doesn’t have teeth down there or she’d bite it off!”
A man shouted back, “A good reason to stick your finger in first and test it before you poke your cock in!”
Then Antius’ swings lengthened, delivering the last hard, solid blows that drove the wedge in tightly, never to come out. Each blow rattled the cross, jolting the nails in my wounds, sending shocks echoing through the bones of my arms, each one dragging a groan out of me. The pain was excruciating!
“Oh gods, please stop! Stop!” I heard myself begging him. But Antius only laughed and kept on with his work.
Hercules said, “She really has some muscles in there! Stuff her full of walnuts and she’d crack them and spit them out of there all shelled for you!”
“She’d crack YOUR nuts, more likely, if you ever got it in her!” A woman in the crowd laughed.
“Well, I think it’s sad!” Ajax announced. “She really was sitting on a gold mine! Now all she’s good for is squeezing a man’s finger, and there’s not much market for that!”
“Well, a few days with that cornu will loosen up her cunnus! Only ones who’ll say she was a great piece of ass then are that bunch of crows over there!” Hercules said, wistfully.
Hercules slid his finger out of me, leaving a tingle deep inside of my vagina that throbbed with every heartbeat. I needed to clamp my thighs together, squeeze my porcella, rub it, anything to quiet the sensation, but there was nothing I could do but try to will it to subside. And everything else that was happening to me, agony in my wrists, pain everywhere, and now the anticipation of what they were about to do to my feet, all of it should have been enough to force the feeling in my vagina far into the background. But it didn’t.
Here's the scene:
Here are some obscene views - there aren't many in this scene that aren't: