Very confidently swallows a very large cock, why should we be surprised that she easily takes it in her other holes too! By the way, in her mouth she takes the cock deeper than in the front and in the anus! So I think a long dick isn't important to this woman, a small, decent thick one will do.
The sister is really very horny, to get her brother into bed like that, it would have to be such a hen. Although in principle the brother is also particularly pleased with such sex, because they fucked just amazing and that can not take away from them. Although I think that such a mad fuck they will have more than one time, we can only wait and see, because she 100% dreams of his thick cock.