First of all it was pleasant to think it was painful to her but this should have been foreplay for both the discipline and the sex. The other guy who was doing the interrogation and breath control/denial should have been quadruple demeaning in his verbal abuse and more creative with restricting her air and thus her suffering (clear dry cleaning bags are so light thin and dangerous, remember when Jack Bauer tortured his brother with a clear trash bag on '24')? She was only cracked and needed to be broken, then when your sure of that complete physical/mental collapse, go a second time for the fun of it.
What a waste of a good looking girl who was clearly up for some role play and ready to suffer for our pleasure. Nice concept but badly let down by the poor quality of camera work, direction etc. Could've been so good but wasn't.
Kinda soft, what about caning her ass until she is bleeding, then caning the inside of her theighs and make them bleed. Then smack her face, give her a fat lip and a black eye, then mouth fuck her.