Such a difference an inch makes. (Now where have I heard that before?).
This
time I have fastened Carly to the device much more securely because I
know that shortly she will really want to be off of it. Her ankles ropes
now limit her movements to the gait she will use to minimize the pain
to her pussy. 
I've
tied her legs pulled slightly forward to make it harder for her to rise
up on her toes. 
And
in a modification of the typical position, I've tied her wrists behind
her back, pulled rearward. If she leans forward, her hands are rise off
of the bar offering her no support. If she leans back she can use her
hands to support her weight, but the stress in her legs increases.
Oh, and my evil side must be showing as I have pulled the board about one inch higher into her crotch.
I have inserted a ball gag to muffle the protests I know to be imminent. Also, knowing that she is in for a painful ride and will probably start to cry, I took the liberty of pulling it in especially tight - after all, chafing at the bit is what pony is supposed to do isn't it?
Quite a fiendish setup isn't it? Yes, I like it too.
She
has started her ride now. After an initial period of pleasure, I am now
rewarded with the effect I was hoping for. 
When
she comes down off her tip toes, the hard wooden board comes into full
contact with her pelvic bone, often crushing her clitoris in the process.
So she has started the process of riding the pony - lifting one leg then
the other, rocking forward and backward in a futile effort to find a comfortable
position. It is a real pleasure to watch.
She is crying now. So far I have ignored her muffled pleas to let her dismount. I plan to ignore them for a while longer - I know she can take it.
I
know she is really in pain now because in a moment of weakness I removed
the gag long enough to hear her request to open the door so that her roommate
will know that I'm not really killing her. She has never asked me to do
that before. I've opened the door and reinserted the gag.
A few more minutes of screaming..........