To be honest, yeah I have. I've read things as intense as Yamane and Zaria's work on my phone out in public... with the straightest face. (Though I do turn my phone inward a little and glance around to see if anyone is peeking, haha).
I read in public if I read on my phone, but when I'm using the laptop I read when nobody's watching or near me. It would be awkward for me and them to what I'm reading. ^_^
When I use my phone then I just do a poker face :) reply
