I do not know about the indefatigable brother, I think he got tired) Sisters certainly are all on the positive. The way they got caught by their mother and the brother hid, it was well thought out. But then when they went on and the mother, or whoever she is I don't know, was sitting next to them, I didn't understand why they did that. It was nice to watch, especially the sisters, the brother was kind of passive in the clip, he was almost never even shown.
So much passion, I love that kind of scene. The pool is gorgeous, big with clean water, just right for lesbian games. Two girls licked and rubbed each other's pussy good while the third one was on top smoking. Although I suspect it got to her later, too.