Love Letter For Pan?

During the curtain speech of Endless SHOCK's evening show dated 30th March,  they prove their love is still going strong:

Koichi: So Tsuyoshi's manager comes up to me before the show today.
(Kinki fangirls say "kyaaa," Koichi-only fans roll their eyes.)
Koichi: He gives me a letter. It's addressed "To Pan." ... To my dog?
Koichi: Inside it says, "Congratulations on the last day of performances."

I love Tsuyoshi for teasing Koichi. They crack me up xD