Bratty little step sister caught you jerking off on mommys satinblouse (11:28)

I don't even suspect anything and just came home from school still wearing my schoolgirl uniform with a cute white blouse, a sweet pink satin bow tie and a short pink pleated skirt. I go into my step brother's room. But...what is this? Oh no step brother what are you doing? I caught you...wanking...but wait! What's in your hand? Are you jerking off on mommys satinblouse? You're so ridiculous! I can't believe it at all!
But what happens then you can hardly imagine!.........