Hi,
I'm looking for a manga I've read ages ago. Both characters were already over 30 I think, the seme was dark-haired and the uke blond, I think the uke was a famous conductor or something else that had to do with classical music? It was a pretty serious manga and the uke also had some issues (like there were some scenes where he kinda got creepy/psychotic). I think his son also appeared or something, he was some kind of rent boy...? (Or I'm confusing it with something else, but I think it was something along these lines) The style reminds me a bit of Hidaka Shoko (it isn't by her though, at least not that I was able to find), a bit "old-fashioned".

Hope you can help me!

could it be Tenshi no Uta (NISHIDA Higashi)?