Mary Renault's novels--she was gay herself--and thus able to write "the homosexual side"

https://www.google.com/search?client=firefox-b-1-d&q=Alexander+the+great+novels+by+Mary+Renault

The Persian Boy is exceptional.

Alexander "inherited" Bogaos, who was Darius' "Persian Boy."

He figures prominantly Funeral Games--at the death of Alexander in Babylon.