This is really simple. The way this goes is that the person above you makes a request to see a certain kind of picture (Of Naruto, Sasuke, SasuNaru,NaruSasu or anything related) and you post it. On that same post, you request for the next person to find you a certain photo.
EX)
First person types "I want a pic of Naruto sleeping next to Sasuke" then somebody posts a picture like that,and then she/he types their request...
example: "I want to see Sasuke protecting Naruto from Itachi" so the next person posts a picture with that.
Awesome!