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.
Posh lady and anal well developed! My dick goes in with a bang! But I personally would fuck her in the ass too, it's a shame not to try such a gorgeous lady from all sides! And one more thing - you shouldn't fuck in the anus without a condom.