There’s more than a dozen ideas in this post:
Experiment and discover what you find most humiliating.
It might be sitting on the toilet and wetting your panties.
It might be the shame of wearing punishment panties.
It might be forcing yourself to go out in public just after a spanking, whilst your bottom is still hot, stinging and sore, and your slit is sticky and soaking wet. Your cheeks will blush as you interact with strangers, as you wonder whether they suspect your shameful secret, the spanked pink bottom hidden just beneath your clothes.
Or it might just be the shame of accountability, sitting on your spanked bottom, having to send a message to your disciplinarian describing how and why you’ve just been punished…