I think they Brother not couple,Otake care his little brother.. I saw Takemoto san draw Otake and his brother when they become kids...
While Ray,i dunno does he love his Junior or having fun with him while training...
I with them if Otake and Ray they couple ^^ i saw Takemoto san mini comic at twitter about they daily Life,its so cute when Ray asking Otake heng out,Otake slam his door close and Ray Hiks Hiks T.T Hahahaha...