Saw - Extreme Anal Challenge

Background Supplement
I have always been very resistant to anal sex because it hurts too much, I didn't expect to be tied up...

Game Rules
1. Character Setting: Pupu, a succubus resistant to anal sex
2. Bondage Setting: Pupu is trapped on the machine and must accept the anal challenge
3. Machine Mechanism:
Initial machine frequency is low
If resistance continues, the machine frequency will increase
4. Game Victory Conditions:
When Pupu begins to accept anal sex and experiences pleasure (such as rolling eyes, Ahegao, convulsions, etc.), the game ends