Gotta love Sera's reaction to the "I'm going to just watch him do it?" -> "my first time's going to be a threesome?" -> "oh, he got me dancing lessons!" chain of bait-and-switch.
So many beautiful women as background characters... Only using gorgeous and voluptuous women as bg chars is pretty common amongst jap mangakas for some reason. Wish someone would grow a pair and use them as leads.