I'm too lazy to translate the whole thing at the moment, but the gist of it is, her Master is congratulating her on a good workout, but she's thinking how much she hates exercise, and the way being sweaty makes her skin feel, yet she knows that after exercise comes "massage time" and she doesn't want to miss out on that.
from the looks of it it's bad colored sweat, as it is only in the shadowed areas
Whew! We sure moved around a lot today! Let's keep up this pace! Hahaha- (Master)I don't need to exercise like this to get thin...
...But if I say that, I won't get "Naughty Massage Time" every night anymore...
Uuu... What do I do...
Hah... This sweating is making me feel sticky and gross...