Who knows the australian serie Neighbours? This is very famous in my country (Australia). When I watched PLL, I saw on similarities with neighbours, when Aria meet Mr Fitz, they Kisse and the other day she discovers he is her teacher, the same with Rachel (played by Caitlin Stasey by the way) in neighbours, Rachel meet Angus, lied about her age, and they share a kiss and the next day she discovers he is her teacher, there is the same look between Aria/ Ezra, and Rachel/Angus. And later they both start a real relashionship