if you blackmail her for a while and then you bust her, more than likely she will also tell your dad that you were blackmailing her. He'll probably be pissed that you didn't tell him right away.
Here is what I would do...I'd make a hundred copies of the photo and plaster them all over the house. The shear panic she displays oughta be priceless! Time it right so that she only has like 5 minutes to try and get them all before your dad walks in!!
UncleChunky Reviewed by UncleChunky on . What would u do if u ever caught ur step mom cheating? Ok lets just ur step mom is 40 and is caught nailing some 25 year old employee in ur bed.... She is very strict with u, never lets u smoke pot or do drugs for that matter... And says sex b4 marriage is wrong.... U have photographic evidence that she was doing it... How would u blackmail ur step mom into doing what u want? Rating: 5