Midnight Education
One day, Chiaki, who is the most popular "top" at a gay brothel, is saved by a newcomer, Renya, when he is getting hassled by a needy customer's excessive attention. When he promises to buy Renya a drink in return, Renya asks him for tips on how to attract customers instead, since he is "struggling with low demand." Despite saying that, with his handsome looks and gentle hands, there's nothing to stop Renya from becoming more popular. When Chiaki starts giving him advice on techniques, Renya suddenly smiles provocatively, pushes him down, and makes a forceful move on him..!
Note: Includes an extra chapter.