Deichuu No Hasu summary:

Content Warning: Contains depictions of incest Following the death of his parents, Motoharu raises his younger brother Akio. All on his own, Motoharu starts selling his body to make ends meet. Akio, an honors student with a bright future, often catches Motoharu sleeping with his "clients" and cleans up after him. But, despite the "perfect little brother" image, Akio harbors a dangerous brotherly love...+