Looking for an Omegaverse BL Manga

I have only read one chapter (or maybe it was just a progue) so this is all I know/remember about the plot -

So the uke seems to be staff at some kind of event. An omega would perform on the stage (play a piano or something) and Alphas in the audience would bid on him. The omega would be paired with the highest bidder. Seme was an Alpha and one of the guests but it seemed he was more interested in the uke. Also, the omega and the uke were cousins if I remember it correctly. I don’t remember if the uke was also an omega. The art style was really good too and the panels were coloured.