Dave (who was actually Janet in Dave's body, but didn't know it) continued writing ...
"Come on, Tim," Janet said, smiling. "It'll be a lot more fun if we make it a threesome."
"I don't think so, Janet. I only like women," Tim answered.
"Aw, you're no fun," Janet pouted.
Dave paused. That was no good. Yeah, he knew Tim was totally straight, but this was just a story. No need to keep it true to the real world. He went back and erased the last few sentences. He looked at the last thing now written on the sheet of paper: "It'll be a lot more fun if we make it a threesome." He smiled. Now to make the story a little more fun ...
Tim smiled. Being bisexual, he was always interested in a threesome. "Count me in, babe," he said, moving towards Blaine.
Dave still had no idea that his writing was altering reality.