EzioAuditore_1
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If there are no rias in the harem, it is not called a harem.
Inner world sub dimension only he and family can enter exit from maybe sub mutation dimension lost sacred gear or tied to his soul so can go with when he goes like in dxd
I was just thinking he should be given essence of the home
he is an angel of heaven y would he bother himself with a devil
essence of home and definitely have Gabriel and yasaka in the harem