The Aflicted Ch20 By ShyChiWriter (one of dozens of unique sex scenes in the story. Another the girls teleport cock to cock and slide down and teleport again.
http://www.literotica.com/s/the-afflicted-ch-20?page=2
"Martin, what are you doing?" she cried breathlessly.
"I don't know," he replied, though he undoubtedly felt the change as well.
Splash came another blast of cum, push came another surge of his cock.
"Oh my god!" she cried.
She had to see what was happening. She lifted herself up to the point where Martin should fall out of her – but the tip of the cock she had recently known, the cock she had pulled down her throat and welcomed inside of her – it was nowhere in sight.
"Did you do that on purpose?" she whispered.
"I did nothing," he said. "I'm just as surprised as you are."
His words came out in gasps. He was still cumming after all.
She lowered herself down again and felt the pressure again, but not uncomfortably.
Splash shot his hot cum. Push came his cock and a torrent of cum actually dripped out of her, having nowhere else to go in competition for the space within her.
She was fiercely curious about what was happening. Lifting up her feet, she placed them on the mattress beside his hips so she could squat and raise herself higher. Higher and higher she lifted off of him, but the amount of cock just kept on coming. At last the tip was at her opening, and the size of the monster that had emerged from her pussy was impossible to comprehend.