Struggle and try to get rid of your restraints

You struggle, the restraints are part of a bigger machine and are not tight enough, when you are relaxed, without a machine raping your ass, it's easier, and slowly, you slip one of your hands out. after that, you start to get rid of the other restraints, but before you finish, the nurse comes back and she laughs.
"No, no little mouse" she mocks you "I have to teach you a lesson"
The nurse uses a syringe to sedate you, and you faint.

You wake up tied up on a stretcher. You are immobilized, and you feel strong pain in your ass, the nurse put a huge speculum inside your body and is working with a complex tool on your rectum.
"You should see this" she mocks probing your exposed rectum with a metal rod. "It's like a gaping chasm. I could put my entire hand in there. Would you like that?"
You moan in pain, drooling, affected by the sedatives.
"Let's see how sensitive you are" she says, pressing the rod against your tender rectum's walls. "Or do you even feel it anymore? but don't worry, I finish with the medicine, you will be more relaxed and obedient."

"I think that you are a naughty girl and you love it, do you want me to call the doctor and continue?"