What is the most humiliating thing you have subjected you slave/submissive to or have been subjected to?

I was in the shanging rooms at school, and everyone had gone exept for three other boys. Two of them held me down, and the other one stripped me stark naked. Then, they took it in turns - two of them would hold my arms and legs in a spread eagled position on my back on the floor, and the reamaining boy would sit on my face. He would whip me with a belt until I tongued his ass-hole. If I refused, all three boys would piss on me and make me do it again. If I still refused (which I did), I was tied down, and all three boys cummed on my ass and in my mouth. It was all pretty humiliating.

I used to see a married woman at times. Her husband was very dominant and almost abusive. I was her outlet for that. She loves to humiliate me. She would make me lick up own cum and then started bringing me creampies of his to lick up. She later started using a strapon on me and really got off on it. One day we were at a hotel and she tied me, bent over the table in the room. She had dressed me in stockings and a garter and had been using her new strapon when she stopped and ordered a pizza delivered. I was still tied to the table when the delivery guy showed up. She opened the door wide and I know he saw me bent over and tied up. Being seen dressed in womens lingerie was a bit embarrassing, but what I didnt know, till she closed the door, was that she had still been wearing the strapon.

She also took me to a lingerie store and made it very apparent to the clerk (and anyone else close) that she was buying panties and stockings for me. As we checked out she said "I think he will look good in that. He is going to suck his first dick tonight." I don't know who was shocked the most, me or the clerk, but I know who was the most humiliated.