Der Vater meiner Schwester (2005)

A teenage boy discovers that his supposedly deceased father is very much alive in Der Vater meaner Schwester (My Sister's Father) (2005). Paul (Ludwig Blochberger), who was raised by his single mother in Munich, grew up believing that his father had died on a trip to India before he was born. Then one day Paul's mother makes a shocking confession: his father Klaus (Christian Berkel) isn't dead at all. In fact, he lives only a few miles away with his new wife and daughter Susa (Katharina Schüttler), Paul's half-sister! Klaus doesn't want anything to do with his long-lost son, so Paul pursues Susa, never telling her who he really is. But when Susa unwittingly falls for her half-brother, things get a lot more complicated. Kinky Katharina never actually gets it on with her half-brother in this SKINcestuous TV movie, but she does display her dairies in a blink-and-you'll-miss-it shower scene. This soapy sister will get you hot and bothered!