Yvette shows Adriana, how to apply a proper school-girl-pin.... an have fun on the slave ;-)
She steps over him and decends on his chest, having his arms under her knees for immobilisate them.
He struggles and buckles like a rodeohorse for get free, but no chance, however.
Adriana takes place behind her on his stomach, now its clear under these amounnt of flesh is no buckle for escape.
Yvette shows her friend different methodes for fixing the arms, kneeling, muscle riding, standing on the arms and so on, and Adriana imitates this.
Yvette comes closer to the throat, presser her crotch on his windpipe, then she lands on his face, while Adriana follows.
When Adriana sits, Yvette steps on him for some more action, kneels on his chest and adriana sits on her back for increase the pressure to his chest....
And finally again on his face, this time reverse, digging his nose deep in her ass-crack.