"Well..." Ning Chenguang coughed awkwardly and closed the book, "Why are you suddenly interested in this?"
"Less nonsense! Hurry up, hurry up." Ning Chenyang urged relentlessly.
"Uh... alright. I'll explain it to you." Ning Chenguang, who studies medicine, views everything through a doctor's lens without gender distinction. After a brief awkward pause, he switched to scholarly mode and explained a series of medical terms to Ning Chenyang.
An Hao came upstairs to clean, and upon hearing Ning Chenguang going on about the formation of menstruation, she didn't react much.
They both study medicine and don't view this as something shameful or embarrassing.
So she just kept her head down and continued working.
Ning Chenguang explained to Ning Chenyang for quite a while, feeling rather parched, he picked up his coffee cup and took a sip to soothe his throat.
An Hao seized the chance to ask, "Who are you telling this to?"
"My brother!"
