Who sits first or who stands first is of no importance whatsoever.
Priests, unfortunately, are often WAY too busy to just stand and chat. As much as they really would like to.
If you have something (like a bible or a medal or a rosary) with you that you want him to bless, go ahead and ask him. He’ll stop and bless it.
I wouldn’t regale him with the smarmiest dirty joke you’ve ever heard, either. Give the poor guy a break!
Remember… priests are people like you and me. They just have a different call for their lifetime vocation than you or I have.
And please, if you’re having lunch or dinner with him, don’t let him pay for it. Remember, he’s got that vow for poverty as well as celibacy and obedience. He does NOT personally own that car… or anything at all.
Unless it’s a personal gift that you’ve given to him.
And always, ALWAYS tell him that you’re praying for him! And do so, too!
Priests are ALWAYS thankful for knowing that someone is praying for THEM, personally.
Like us, they need prayers.