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Not defending the relationship or whatever it is they have going on now… but from MY OWN perspective it seems the black hair dude raised the uke as a brother and such but realised that the uke might have developed romantic feelings as he got older. And since all he wanted was for the uke to be happy he never acknowledged those feelings which resulted in his own feelings changing over time. Now about the cctv I reckon since the uke seems unable to survive on his own and he might have an accident which could even if minor result in his death the older dude installed them out of concern that later became twisted as he watched the uke masturbating.