It's not even quite clear whether the brother helped his sister, pleasured her, or taught her. Either way, she should be grateful to him after a fuck like that. It's funny to see how he uses both his phallus and her toys to develop his sister's anal hole. It's bright and exciting, and you can see the details that are so valuable in a process like this. I wonder what he will turn her on with next time.
I can say that the stranger behaved with the brunette on the bus as if they had known each other for a long time. He laid around flatteredly while the girl was sucking his dick, and they fucked each other without any shyness. The damsel took a ride not only on the bus, but also felt the powerful bumps in her hole from the guy's stick.