Pretty much every time Akari meets Cait Sith. Especially notable to this troper is episode 21 of Aria the Natural when Cait Sith invites Akari on some special train and she gives away her ticket to a kitten. He holds her face so intimately and she looks so happy to have her cheeks rubbed with his giant paws... it might seem ridiculous but this troper got all fuzzy inside.
"May this town's kindness reach the hearts of many people..."