"Now, before we begin tonight, I want to try a little experiment with you."
Tom nodded. He couldn't meet my eyes and his eyes were constantly drifting down to look at my breasts.
"It's simple really," I said. "Just guess what color panties I'm wearing! If you're right, you'll get to fuck me!"
He looked at me, pleadingly and felt very helpless. He had no way of knowing the color.
"Come on," I teased, "Guess!"
Tom didn't know what to say, but his cock urged him to get on with it. So he said "Ah... Black?"