I AM UNFAITHFUL TO MY GIRLFRIEND WITH HER step-SISTER WHILE SHE IS IN THE BATHROOM, THE step-SISTER AND HER step-BROTHER-IN-LAW TAKE ADVANTAGE OF AN OPPORTUNITY THEY HAD TO FULFILL THEIR DESIRE TO FUCK EACH OTHER WITHOUT HER step-SISTER REALIZING WHAT HAPPENED BEHIND HER BACK AND SHE STILL BELIEVES THAT HER BOYFRIEND IS A VERY FAITHFUL GUY.