I love facials. I'm not particularly into BDSM, but can see that facials are a domination/humiliation thing. Whatever the case, there is something uniquely satisfying about unloading several days worth of baby batter squarely in a tarts mush and if she is game, having her rub it in and spread it round a bit. Its good for the complexion dontcha know.
CIM comes a close second particularly if you ask the girl to dribble it down her chin afterwards, preferably with a shocked look on her face. Variations can be good as well. The other day I took a cocktail glass to a punt and, after CIM, had the girl dribble the spunk down her chin and into the glass and then drink it. OK, I know its all an 'old hat' porno move but its all good dirty fun nonetheless.
Its always better if the girl is up for vid/pics, so you can keep your finest 'artwork' for future viewing. I have a big collection of self-made porn with some tremendous money shots which are always good to revisit.