That the sister is interested in her foster brother's opinion is commendable. And assessing her worthiness from a man's point of view he can. But asking him to jerk off in front of her is kind of weird. He's going to get her, isn't he? Only this slutty girl is not scared at all - that's exactly what she wants. He ended up flushing a whole puddle on her tummy! Drove it.
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!
That's a pretty expensive night's stay for the lady! I think it was a lot easier for her to get a hotel room than to get fucked by two big niggers. She's an extremist, though! I can only think of two possibilities. The first is that the lady is a nymphomaniac and she got to her favorite pastime under plausible pretexts. The second option is that the lady is hired and works for money. I can reasonably assume that if the lady does not fit into these categories, then she's unlikely to willingly set herself up with two black dicks.
Like a poop.