That's it, basically. I don't have a specific story in mind, but below is an example of what I mean:
Harsha wondered what it would be like to share a boyfriend, and Varsha began to describe it graphically: "While you ride his face, I’ll suck his cock. As you reach your climax, he’ll come too, filling my mouth with his seed. Then I’ll kiss you, passing the mix of his semen and my spit into your mouth—"
Harsha interrupted her: "—and I’ll swallow half of it, use the rest as lubricant on his penis, and he’ll start fucking you in doggy style, pounding you hard. Meanwhile, you’ll lick my pussy until I climax wildly. Finally, all three of us will come again at the same time, then collapse laughing."
