My sister is beautiful and has a nice figure, even though I'm her younger brother. But she's a big spender, frequenting host clubs, gambling, and buying expensive things, and then she comes to me saying she doesn't have any money and asks me to borrow it. This time, I jokingly said, "I'll lend you money if you show me how you masturbate!" and she started masturbating in front of me, and even pushed me down, a virgin, and easily got me with her skillful technique... If it feels this good, I might lend it to her every month!