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.
Asian women are very sensual and erotic. They have one more advantage: this race is anatomically adapted for sex with partners who have a very modest size of the penis. So if your organ is not especially big - Asian women are just for you!