Cocks really are the bane of the world. Men go around thinking about who they can put them in.
It lacks imagination.
As Miss Jessica Hyde points out, cocks might do the fucking... but they can also be fucked.

There is terror on the subs face as she points out how she is going to penetrate his pee hole with her sounds.

Starting small, Miss Jessica starts to fuck the hole with the first metal rod. The cock twitching as the first rod slides in...

So then it's time for the next size up.

Miss Jessica states an ambition of one day stretching the slave's...

Cocks really are the bane of the world. Men go around thinking about who they can put them in.
It lacks imagination.
As Miss Jessica Hyde points out, cocks might do the fucking... but they can also be fucked.

There is terror on the subs face as she points out how she is going to penetrate his pee hole with her sounds.

Starting small, Miss Jessica starts to fuck the hole with the first metal rod. The cock twitching as the first rod slides in...

So then it's time for the next size up.

Miss Jessica states an ambition of one day stretching the slave's cock so much that she can fit her strap on in his cock.

But for now... another size up.

And another.

Filling the hungry cock.

For a big finish... the slave is literally going to be fucked inside out - the largest sound inside of his cock, masturbating from the inside out until he cums to release.
Of course, this is conditioning, to condition the slave to only be able to cum from the cock after Miss Jessica has had her way with it.