Just to add a bit to that, I can make any of my kinks feel embarrassing or humiliating if I'm in the mood (tight hot sweaty rubber suit, snug sneakers, invading anal plug, enema nozzle lodged in my bottom with water filling me up, restraints so I can't get away from her, etc.). However the best kink for embarrassment and humiliation is definitely enemas, especially large (~3-5 quarts) ones for long hold times over an hour, sometimes with cramps, gurgling solutions in you. It's invading one of your extremely guarded and private places including both holding your anus open and filling your belly with heavy solution. It just feels like your partner couldn't find any more intimate a place to totally take you over and control you. It's extremely easy to be very vocal about any number of aspects of what she's doing to you, like too much water, too many cramps, urges to empty, belly pressure, bloating and distention, etc. and when I'm her enema sub I really make it obvious how helpless, dominated and humiliated it feels, which my Domme loves to hear. The more complaints and begging, the better her arousal, which is half the point. The other half is letting me enjoy the intense submission from being forced to hold a big enema. We both thoroughly enjoy our D/s enemas, in either role, though I especially love being her enema sub, with the other kinks (rubber, sneakers, restraint) added on for more submission. Among others, a particular time that the embarrassment is delicious is after I've been holding the first enema for over an hour being edged, restrained and sweating under my rubber suit, and then I get a second enema without releasing the first. Then she'll tell me something like
"Oh, by the way, you'll be holding both enemas a good long time, because first you're dragging your belly over to me on the bed, then fucking me and giving me orgasms and then waiting for my post-orgasm nap to be over. If you're really good at it I might let you orgasm and undress tonight, but I do so love watching you sleep still full of water under all your rubber, so we'll see - maybe tomorrow morning."
At which point I think both with dread and delight "Oh my God, I wonder how much longer she'll make me do this?", and feel an enormous satisfying wave of both intense humiliation and mild dread/arousal at having to endure it all even longer. But I'm also delighted she's so dedicated to satisfying us both. More to come with the next partner, I hope.
Eric