"I appreciate the warning and information, as always, but in this case once you've given it I would really rather you 'introduce' the thing, let gravity work and keep talking to me about soft drinks - or anything else."

Does he sound pissy? Yeah, a little. It's a tension thing. For some reason he is now having a really hard time with the... switch back and forth between clinical and not. Might be the positioning and lack of physical contact, might be general nerves, might be both. At least he's communicating clearly?