The art really brings a rapey, pedophile feeling to it ..
…Wut? >.> You mean the predatory smile near the end?
What predatory smile?
You could make a case for page 391, page 419 and 423 definitely count, you could say 424 as well but I probably wouldn't count it personally.
It's a pretty simple formula, her eyes are not or only partially visible, she's smiling neutrally and her lips are fairly thin, her mouths just barely open and showing no teeth. She also seems to have no particularly outstanding other expression (blush, for example) that would change the context.
Overall, could be anything, but without the eyes and a big smile or one that shows teeth, there is a sense of concealment and possible dishonesty or masked ill intent or malice.