Looking for an excuse to be able to fuck his own sister

Getting to fuck his own sister is going to become the big milestone in this guy’s life. He has drawn up a master plan with which he intends to stick his dick in her till he gets tired. He tells her to please sew a button on his pants and with that he is already naked in front of her. He puts his hard cock in front of her face and insinuates that if she likes it, he could stick it in her pussy so that the two of them can enjoy themselves now that they are alone at home. She lets him convince her and fucks him, watching how the slut rides him and how she moves her ass with his dick inside in a very professional way.