Apparently to Ash (Author) this is chapter 4 but I am 100% sure I already did chapter 4.They probably got rid of their previous chapter 4 and decided to use a new one.
Appreciate the great ahem ...art on onee-san, just wish there was a more going on between the pages we get. Instead of the slight changes to expression that we get so far.
I like what seems to be the revised chapter 4 (maybe the previous one can be set as an alt version). This chapter gives a different impression of onee-san: more teasing, less outwardly flustered (still blushing ears though! )