Good lord, that does sound intense. But if it's from 1934, there might be an obvious reason why the author had to keep it barely subtextual - unless this was published in exile and not in Germany?

(ETA: I mean, I don't know what would have happened if a German publisher post 1933 would have published a novel in which there's a textual same sex romance for National Hero Frederick The Great (tm), but I don't imagine it would have been pleasant. Even before Röhm's death. Otoh, if it's an exile novel, well, Klaus Mann published a gay Tschaikowsky novel in 1935, in Amsterdam.)