The scene to watch for in Nicole Sheridan's Domination Diaries is when Spanky, bound by a rubber straightjacket and hanging from her feet, is dunked in an underwater tank, then forced to fellate a big black dildo which stands erect from an inflatable rubber body bag holding Lexa Lane.
The rest is less exciting (maybe even forgettable), but the soundtrack is better than most - properly industrial by Glitterpimp. There's also an exciting ending, but we won't give it away.