Heidi: Das Luder von der Alm 5(2005)

In the fifth volume of the Heidi series, Heidi has left the Swiss countryside for a boarding school in Frankfurt where she befriends the sexy but wheelchair bound Klara. It seems everyone in the school is just as horny and hypersexual as Heidi, from the maids to the teachers, everyone is having sex - including good old Aunt Dete.