If you're familiar with the Touhou series, the reason to why she said this and reacted the way she did, was because of Satori's ability to read minds. Thus the reaction.
Basically Eiki was thinking that Satori's cloths smelled nice and she heard her and replied that Eikis cloths smelled nice too. Thus insinuating that she knows what Eiki was thinking and made her embarrassed. (She jumped the gun)
Also, its nice to see another one of these strips. (no pun intended)
Satori-san's clothes smell pretty good, though...This is somewhat embarassing.Well.. eh..U-uhm...your clothes have a nice scent to them as well, Eiki-san...Attempt at exchanging costumesU-u-uhmmm, well, uhh...