Don't know why it didn't occur to me to write about this earlier:
Couple of years ago I was sharing a shower with my then girlfriend. She was soaping me up and washing me, then started on my cock. Of course I got hard, then the evil took over and I slapped her hard, grabbed her hair and forced her to her knees, then pushed my hard, soapy cock into her mouth!
I took great delight in the fact that her struggling and choking was worse than usual, so I pulled out, handed her the soap and made her start over. I rinsed and repeated for a good half hour before I finally whacked one off over her snot and tear stained face.
Forced soapy cock oral - try it, you might like it.