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.
Yeah, poor guy, for a certificate that he's healthy he had to put up with these sexy nurses and doctors and fulfill all their whims, and how many of these patients go through them in a day, horror, a torture chamber just.