Like the mountian

Plagg's POV

I never realized how much I loved Tikki until I thought I was about to lose her.

Tikki's POV

And then there was Plagg. My heart ached just by thinking about him. I missed him. My Panther. Before Plagg had been the first Black Cat Ring wielder, he was just a common thief in ancient China many, many, many centuries ago.

***

Or:

Plagg and Tikki through the pilot episodes, going through the memories of each other through the centuries.