The woman is just a sex queen! When standing upright, you can see how she freely controls the muscles of the front and anus! And this despite the fact that both the front and the anus are clearly quite decently developed. And what a seductive body shape, her breasts are just unbelievable in size and shape. That's the kind of size I like in a big woman! Not a mountain of shapeless meat and fat, but a shapely big woman with stunning forms. I once dated her for about half a year, it's just impossible to forget her! And of course after that with thin women as that at all I have not caught up!
To tell you the truth, considering the age of the brother and sister, it is quite normal that the brother became aroused by the sight of the naked girl in front of him. Maybe what happened next is not part of the plans of normality, but tell me honestly, would you resist such a dark-haired beauty? That's what I mean.
Brother does not have to get bored in the family circle: while he puts his little sister on his dick, while the second one, the evening will pass imperceptibly. A threesome is much better than television and is healthier!