Black Jack no Yuuwaku

The billionaire's bedroom bargain...

Jack Maguire was turned away from his father's house and has never forgotten that day—or how much he wanted his stepsister, Sally. Now a billionaire tycoon, by a twist of fate Jack's inherited his father's property-- and has an opportunity to get revenge....

Jack has a bargain to make with Sally, who has grown into a beautiful, desirable woman. She can keep her beloved house...if she will be his mistress on weekends!

(Source: fictiondb)