But she shouldn't have slept naked, then her brother wouldn't have taken pictures of her fur. And now she has to suck his dick so he doesn't post these pictures online. It's a big brother's favorite pastime to get sisters like that to have sex. She doesn't know that he didn't have a smartphone in his hand and he was just jerking off on her. So he gave the girl a free pass. I'd probably do her ass so she wouldn't be so stubborn!
He got everything he wanted from his sister, and then even cum in her mouth. Cheekiness is a second blessing, you can see that in a brother like this.