Well, the harem is sorta big, at this point some of them are already introduced, like Caron and Shion that he get married to, but there is still his legal wife along 3 others that he get married to by the end of the main story (at that point only Caron and his legal wife have a child with him), the harem include Orca, but for reasons they can't get married but he still end up as his lover, but his harem still have more future prospects that the author already hinted in the WN, like his reincarnated sister