Many cuckolds, particularly those that are penile challenged, derive a strange pleasure from women ridiculing the size their penis. This is made especially enjoyable for them, if it is done by a woman such as yourself, who does it in an erotic, teasing manner.
Even if you do derive an "evil" thrill of power that enhances your orgasms, you do not humiliate in a mean spirited manner intending to actually harm the person, but in more of a good natured, playful one.
I'm sure your cucky pets are very happy.