I Paid Money For My Friend's Little Sister

Knowing each other since childhood, Kazuma has always had the hots for his best friend’s younger sister, Yuuko, but has been too nervous to say anything. Being a good wingman, Naoki offers to help Kazuma put in the good word with his sister for a simple fee. Their dates are normal and sweet, but Kazuma doesn’t have the guts to even hold her hand. If he only knew how much of a submissive slut she really is—something Naoki knows all too well! Yuuko does everything and everyone her bro tells her to do, but can Kazuma finally bring a sense of normalcy back into her life?