"burikko" apparently refers to someone who puts on a show of acting girly, usually to get sympathy from men. Here, Reimu tricks Marisa into taking a stereotypically girly pose. http://ja.wikipedia.org/wiki/ぶりっこ
"How to kill boredom" part. 1 explained by Reimu !
Make two fists and rub them together for a second.Yeah. Now hold them like that and sniff them.Hey, Marisa.Hm?Like this?"Getting Caught By This Kind Of Trick Is Really Annoying, Huh" MangaBored...BurikkoAw come on~ Wasn't that fun?Come on, laugh femininely like 'Ufufufu', just like when you were girly in the past.