As soon as his heat ended, before the first rays of morning sun even seeped into the palace grounds, Xie Jianyu extricated himself from sleeping Zhang Fengxi's embrace and returned to Fuxi Palace.
Almost immediately after his return, he contracted a fever. One that refused to ebb away no matter how many cold baths and bowls of fever concoctions he downed day after day.
Until eventually, his absence at the palace started drawing attention. Naturally, Xie Jianshen was the first one to arrive at Fuxi Palace to inquire about his younger brother's condition.
"Little Yu?"
With a gentle pull, Xie Jianshen opened the bed curtain, prompting Xie Jianyu to crack open his eyelids.
"Big Brother... Cough... Cough..."
Xie Jianshen helped Xie Jianyu into a sitting position and patted the latter's back until his cough subsided.
"What happened? Did you catch some cold after Winter Solstice?"
"... Yes."