Yacchan and yuri is soo suspicious, i'm gonna focus on these two. since yuri's chara is alwys my fav type(like undertaker in black butler and 86 of vassalord)
i think that it was the mangaka's style to open the story in the perspective of a third wheel to make more impact and conflicted feelings? also for it to appear "twisted" or to stand out in the world of S&M
Ahh they are perfectly matched..its like seeing a highschool version of katekyo!