Please Stay By My Side,
In My Dreams...

Cardcaptor Sakura: Episode 65 - Sakura, Yukito, and the Vanishing Power
Sakura and Yukito and His Fading Power
Sakura to Yukito to kieyuku chikara
Air Date:  February 15, 2000
Animation Director:  Fujita Mariko

Episode 65, this episode would be the pinnacle of the ToyaxYukito question. Culminating in the power transfer scene between Yue and Toya. But it is not just that scene in that episode that is important there are several scenes between the two that tense at times, and heartrending at others. 
The animation director for this episode was Fujita Mariko, she did the most animation direction in CCS and by the time Episode 65 comes around she is an old hat at it.  She also after her stint on CCS went on to be a character designer for Galaxy Angel and Rosario to Vampire.  The lines are beautiful and the colors brilliant and moody at times.  The storyboards borrowed heavily from the Manga and the quality of the animation reflects the source material as well.

In the meantime be aware, SPOILERS AHEAD!!!