From 2D Market:
Meet Misaki and Yuu, two siblings who couldn’t be more different. He is hardworking, she is lazy; he is loaded, she is broke; he is plain, she is smoking hot.
In an attempt to even out the difference, Misaki offers a bit of her sexiness in exchange for some of Yuu’s paycheck. And as an assertive older sister, she doesn’t take no for an answer.