Dirty Talk is a fun and great thing to incorporate into foreplay and sex. I either say such things in a commanding tone if my face is away from her or in hopelessly aroused whispers in her ear.
There are a few themes that are always good to go with:
1) Desire “I want to pound so bad you will have trouble walking tomorrow”
2) Specific Physical Compliments “Your delicious plump ass makes me want to devour it and devour you”
3) Describing the sensations “Your moist wet pussy tastes perfect to my hungry cock”
Here is a nice exercise to do to improve your ability to give more life and poetry to these:
Think of a basic phrase you could want to communicate: Your legs are hot
Add adjectives: Your long shapely legs are hot
Find synonyms or replacements for the adjectives: Your endless gorgeous legs are very arousing
Consider replacing adjectives with either a metaphor: your endless gorgeous legs light my fire completely ablaze
Or a link to a particular desire: Your endless gorgeous legs make me want to slide my hard dick all across them
There is also dirty talk involving dominance. Obviously make sure to talk about these beforehand, work out a safety system, and otherwise practice the principles in the guide to safe bdsm play.
The first category of light dominance has a theme of naughtiness. You affirm that she is enjoying it (or make her affirm it) and say how it proves she is dirty, slutty, naughty, or otherwise a bad girl. About 60% like this.
The second category of light dominance is posession. Her pussy is an object of yours for you to use as you like for your pleasure. About 50% like this.
The first category of heavier dominance is a step above naughtiness to filthiness. She is a pain slut, she is a whore that deserves to be fucked roughly, etc. About 25% like this
The second category of heavier dominance is degradation, that she is worthless, and only exists to be beaten for amusement and for her pussy to be used. About 10% like this.
You can dirty talk if you are playing as a sub, but of course generally you don’t speak much. But with worship you can sometimes express honor at licking/kissing that body part for its beauty, and also in general when prompted to say something, make sure to add color to your words.