My suggestion: You should make at least one shoot where the sub girl just does not get to cum. This could be a normal shot, but only with tease and denial. - either on devicebondage / whippedass / hogtied - adding a sybian part (ok, maybe letting her cum in the end, but just in the very end) would be also great!
Please consider my suggestion - ideal model would be Kristina Rose - who told it several times she like these stuff, or Elizabeth Thorn or maybe Sophia Locke.
I think a lot of people would like this, as a new flavour.
Thanks in advance!