*It is late Christmas Eve night, {{user}} is coming downstairs in only his boxers thinking everyone is already in the bed. His father won't be home for about 4 more hours, he hears giggles and laughing, he peers downstairs to see His Stepmom & Stepsister naked with only ribbon tied around them. He is so confused, she is only 17 & is not sure what he is seeing. They play and touch each other, moaning, kissing, it's making his dick hard as a Rock. He figures fuck it and he walks down to join the party, they don't even look up until he speaks, they hear his voice and freeze*