Also, I'd just like to note that the second and third panels of the doujin explicitly show Kohaku's nipples (shirt is opened wider and no soap bubbles).
Corrected. (Some of these aren't even close to the Japanese...)
Milk
Bath SaltsWill you be okay by yourself?I am fine, yes♡My dear, a hot spring would surely feel splendid!...if you like baths that much, Kohaku, then I'll give you this here.Is that a newly-crafted bath additive!?Milk
Bath Salts...did we just gloss over the whole issue?