"Thumb" refers to the boyfriend, so Madoka and Mami are giggling over Sayaka and Kyousuke.
Magica☆Print club stickerAh... I've got something to do. I gotta leave soon.fidget fidgetT-that's right! Sorry, but I'd better get going.This this!hoot hootYour house is far away. Are you going to be okay on time?