A similar movie

I posted in the need to know section that I was looking for a movie where two teenage boarding school girls are in bed, one says, "Make love to me", the other says, "Iiiiiiii caaaaaaaaaaaaaaaaaaaaaaaaant," and the first one says "Then *I* will make love to *you* and it will be *my* sin."

I was told that this was that movie, but it is not. For the record though, Felicity could very well be the single most erotic movie I've ever seen and I'm very happy to have stumbled upon it by accident.

Any fans of this movie know the movie I'm talking about thought?


Could it be Sister Emmanuelle?