She was holding back her reaction and putting on a straight face for the flasher. As soon as she was clear she had to let out the shock and horror.
Emotional reactions tend to get bigger the longer you bottle them up, even in the short term.
Like I said telling him off was just her putting on a front. As for crying, it was clearly very upsetting for her and when you hold back a reaction like that it explodes out of you as soon as you start to drop your guard.
You ever have to hold your tongue when your angry and when you get home your suddenly twice as mad? Same thing.
Lemon party is old news.
And no. I can't imagine any human being crying from seeing Lemon Party, Goatsee, 2Girls1Cup, Cake Farts, or any other weird ass porn. Could I see them going "What the **** ? What the **** IS THIS?!" and/or maybe puking? Yes. But tears as a response doesn't make any sense to me.