Now her sister is getting horny

her sister stayed over last night in the next bedroom, the walls are thin and she told my wife she could here our loud sex all night, she became so excited she began to masturbate making herself wet but still felt frustrated. my wife suggested a 3some so tonight I shall be banging both women, my wife says she would enjoy watching me fuck her really hard, so I shall make a special effort to bang her brains out, apparently she can deep throat big cock and loves facial.