Why are Gackt and Ayu so good Friends ?

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Yea, the show was Waratte Ittomo hosted by Tamori (The usual MC in MS), He asked who's the person Ayu call and Ayu said "Suteki na Hito da yo"(if i'm not mistaken translated as 'A wonderful person') and said "Gacchin!"

The most unexpected part is when Gackt suddenly commented "Ayu-chan Kawaii nee," then Ayu "Gacchin mo suteki or sugoi desu" (or something like that). IMO it is a proof that both of them are having a more than ordinary realtionship, close friend maybe because it seems like both of them like to call each other ;p, as Ayu asked Gackt in the phone about him waking up and Gackt's traits of disliking lights.