Koisuru Ryuu no Shima

After graduating high school, Nijino takes up part-time work to cover his little sister's medical bills—until the day his "destiny" arrives in the form of Byakuya, a white-haired, imposing man who is supposedly an ancient legendary dragon. Soon enough, the dragon rips off his clothes and gives him a mind-blowing experience... and a lucrative one, at that. In exchange for money, Nijino gives up his freedom to Byakuya, though his doubts about their arrangement grow. But, he can't deny that sleeping with Byakuya gives him a thrill. It's as if Byakuya only has eyes for him... What is this feeling...!?

(Source: Renta!)