Girfriend farted on my face

At the time I was 16 and my girlfriend was 17 and we were 69ing and she was on top sucking my d*** as I was eating her out then all of a sudden she sits on my face which was fine because I've asked her before to sit on my face and jack me off so while she was sitting on my face out of nowhere she just farts on my face and as she did that I came it was both discusting and amazing at the same time