So the plot is the uke/mc are on the gambling area or something then he saw the seme/ml going in the bathroom. The mc/uke is now loosing but he has the power of gaining luck and in order to gain that power he have to have sex to the ml/seme because he sense a strong spiritual something. Now, the seme/ml is a mafia and wants to take the uke with him to find who killed his adopted father.
So the plot is the uke/mc are on the gambling area or something then he saw the seme/ml going in the bathroom. The mc/uke is now loosing but he has the power of gaining luck and in order to gain that power he have to have sex to the ml/seme because he sense a strong spiritual something. Now, the seme/ml is a mafia and wants to take the uke with him to find who killed his adopted father.