Okay's Things

Im looking for a yaoi manga that i read long time ago. I know the plot but i cant find the manga☹, anyways the seme and uke goes to the same school but were in different group. They play a game against each other and bet to grant the wish of whoever win. The seme win and ask to sleep with uke. Years later the uke family had financial issues and the seme tries to help by marrying the younger sister of the uke. But he blackmail the uke by telling him that he was gonna take his sister on a boat trio even though shes sick. If anyone knows the story please reply i been looking for it for ghe past few hours