Challenge from the Mistress

I walked in the door and was greeted by my sexy Mistress.
“I have a challenge for you” she says.
I was told to go straight to the bedroom, lose my clothes and take the tablet on the bedside cabinet, press start on the timer and put the blind fold on. I took my clothes off and downed the Viagra hit start to begin the countdown and climbed into the centre of the bed, placed the blindfold on securely and waited for the wife to arrive. She came in a few minutes later and placed a collar around my neck, told me to lie on my back with my ass on the edge of the bed and proceeded to tie my hands above my head to the corners of the bed and placed my ankles into cuffs at the end of a spreader bar.
She then pushed back on the spreader so my knees were up near my chest and secured it to the collar with a length of chain. My cock, balls and ass are openly exposed, vulnerable and at her disposal. A parachute stretcher was placed around my balls, and gives it a short sharp tug with both hands to check it is secure. The immense pull on my balls gets me quite aroused and is observed by the wife who slaps them quite hard.
I was wanked for a few seconds just to make sure my cock was rock hard. To make sure I kept my erection a really tight cock ring was forced down to the base of my shaft.
She gets up and leaves the room. Upon hearing her return, I feel the tip of a butt plug against my ass, a hand reaches around and strokes my rock-hard cock, and with one brutal push, the butt plug is firmly inserted into my ass. I bucked from a combination of pain and surprise and my legs went up towards the ceiling only to be brought back down from a short sharp tug from the stretcher attached to my captured balls. I feel the chain from the parachute move and weights being added and then a sudden jerk as they are dropped over the edge of the bed, pulling violently on my confined balls.
I feel her rise up off the bed, and hear the sound of a camera as photos are taken of my predicament. She sits on the bed next to me, strokes my cock and says,
“You call yourself a man. To prove that you are and not a pathetic excuse for one, you will take my challenge. You will be teased, edged, stimulated for exactly 8 hours all whilst tied down like you are. If you manage to succeed in not cumming or begging me to let you cum, you will win. If you cum or beg me to let you cum, you will lose. Should you win, you will get to do what you have so desperately wanted to do for years and that is you may fuck me and cum in my ass. Should you lose, I’ll lock your pathetic cock in a chastity cage, peg your ass, rub your prostate with my strap on until I milk those balls of all your cum and force you to drink it. I’ll then place the e stim butt plug into your ass with the cock ring attached to the other lead and turn it on to provide post ruined orgasm torture for whatever time remains on the timer since you’re pathetic and can’t hold yourself.”
I feel a sharp slap on the chain to my balls and hear “Do you understand the challenge.”
“Yes Mistress I do”
“Good, you don’t sound so sure of yourself now. Let’s begin.”