Reimu heard human speaking about children getting skin irritation from sweating. It's not really a problem for yukkuri, but they thought that could happen and it happened to the little one, starting a new yukkuri disease.
serves them right for eavesdropping, I guess. What an oddly specific condition. Good thing they weren't discussing aids or something, although I guess a skin irritation is both easy for yukkuri to understand and probably fatal.
KoReimu: "Mishter Heat rash, it's idjjyyy!!"Mother Reimu: "Th-this is Mister heat rash!!""That night, in the stifling heat, Reimu was awakened by the crying of the little one."
"Looking at the little one, red bumps had appeared all over the body, swollen and bright red. The little one was crying and struggling while saying, 'itchy, itchy.'"
“And thus, one more gentle illness for Yukkuri was added.”“Yes, Yukkuris are a conception of misunderstandings.""As soon as they sweat, red bumps appear..."
"They itch, but scratching makes it worse..."
"There's nothing you can do when they're small..." "The younger one has a bad case of heat rash..."Title:【Yu Abuse】 Porridge Porridge (?)In the evening, while cooling off at a puddle, Reimu and Reimu's little one heard mister human talking.