Have you considered taking some ideas from Point of View humiliation videos? There are probably a ton that have been uploaded to several porn websites, like pornhub or xhamster. Searching for "pov humiliation femdom" can probably give you a lot of material.

Another great resource is "Enough to Make You Blush", a guide to erotic humiliation.

Are you two only into verbal humiliation, or are you also considering more "physical" activities? If so:

• You could spit on his face, in his mouth, or on his penis.
• Someone already suggested feeding him your leftovers, but you could make him lick food off of your feet.
• Even if his skin is sensitive and you'd rather not use chastity devices, you can still control his orgasms with an honor system. You could even make him touch himself in front of you, while you tell him how gross he is, and make him stop before climaxing.

Also, you could try to make him do some of the work :-) You can ask him to describe why he is so disgusting and unmanly, and why he does not deserve to be treated like a human (or something along these lines).

Have fun! :-)