I've changed my mind about how this post is going to go; instead of Kakashi getting up to speak to the husband who owns the place, I think we continue the small talk a little more, and then the WIFE shows up after admiring the way they talk and eat together and comes over to appreciate them. From there we can resume our plan to have the misunderstanding occur, and then when it's done, they enjoy a discount meal while playing lovers, and they can ask the husband if they've seen anyone suspicious pass by town on the way out. Debating on suspicious activity that night but it can wait. 

EDIT - Can say the lover's special was a special in the menu. Kakashi didn't check his, so Sakura MIGHT have known this already and thought it might have been too embarrassing to even bring up. This does offer an opportunity she might have considered in her mind prior to the woman showing up.