Beneath the Surface (prompt: planting a seed)
"I guess what I'm trying to say is, I had a good time, but...well, dating you seems like trying to eff the ineffable, if you see what I mean." There was something vaguely dirty about that, Xander thought, but he despaired of explaining humor to Illyria.
"I regret that. I also...took pleasure in our time together this evening," she said, too flatly for him to believe her. More quizzically: "You consider me...ineffable, then?"
Xander groaned. "You know...what god-king wouldn't be?" She hadn't gotten the joke at all.
Three hours later, he suddenly realized she'd made one.