It's something I did with Kate, Marc and Blake, for example, the heroes of the Blurred Trilogy. I came back to them for an epilogue, The Last Sunset, which was first published last year as part of the Shades of Pink charity anthology, and which is now available for free on my website.
Here are 7 paragraphs from this story, just to turn on the heat a little...
She would have encouraged him to move, or wrapped her arms around him to draw him closer, but both speaking and moving were beyond her at the moment. Besides, he knew what she wanted, and his slight smile as he started to rock inside her said as much.
For a little while, Marc reclined next to them, one hand stroking his cock lazily while the other caressed them both in turn; his eyes burned as brightly as Blake’s, the same need—the same love—radiating from both men.
With each slow thrust from Blake’s hips, pleasure reignited inside Kate, but something was off. Something was missing.
At the moment she started to reach out to Marc, Blake did the same. They grinned at each other, then at Marc.
“Join us,” Kate said, and Blake echoed the words.