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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.
I have repeatedly advocated this kind of close family ties. It is better to have granddaughter at home, and grandfather to have some fun and share the experience, than to go back and forth with someone I do not know.