Japanese coffee is a bit different from the sugar loaded stuff we have here. There's a lot of varieties that focus on being "black", which has very little sugar in it. Some types have "a little sugar", which is probably the kind he's pouring here.
If your pet yukkuri gets hurt:
If the yukkuri gets hurt and is weak, the image on the right shows the yukkuri getting better after applying orange juice or similarly sweet drinks. The exact cause is unknown [snip] but return to strength. Well, Coffee (slightly sweet) is still the best. What?... Orange juice or other sweets would cure it... MUKYUUUUUuuu--- Hurry up or [Patchouli] gonna dieeee!!!Lets see.... the way to treat this is... Chapter 5 [The curing]Mukyuuuuu!! It hurtssss!!!!Seems like a pretty deep bite... Whoa!! The heavy cream is pouring out... It's my fault Patchouli got attacked by a dog. Swe----BITTER!!!! What is this!?!?But I don't have orange juice in my house...