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.
Between the boobs it's something! I do not understand only one moment - when she penetrates the anus, she puts on gloves for medical gloves. Seems squeamish, then why does not he put a condom on his dick?