This game would not have been half as fun if they hadn't already established the rules beforehand. Terrence knew exactly what Ella was thinking about - the general idea, not the specifics - and she knew what had crossed his mind, as well. It was almost more fun not to be standing next to her, just mingling and catching her eye every once in a while.
At this point, it was actually difficult to say which he liked better: the images in his head or the look on her face when he knew she was thinking about shagging him.
He came up with another, realized he was nearly finished with his current drink, and started to make his way over to the refreshment table to get a refill.