You can continue hypothesizing, and I can continue experimenting, [ he drawls, as though the hand on his back was nothing. ] It's not sight or touch or taste individually. [ His hand slips away from Gil's eyes, and Rau brushes a forefinger over Gil's lower lip instead. They went plenty of time without touching, to say nothing of tasting. ] Smell seems unlikely.

[ He folds his hands over Gil's chest again, rests his head on them, looks at Gil with innocuous seriousness. ]

It could be hearing. But you'd be bored if I were quiet, in any case.