You know how politics can get - late night screaming matches... (ArchonOfFlesh)

Context from original OP:

Shangguan Wan’er (664-710) had her whole family executed as a child by the only female emperor, Wu Zetian, as her father had criticized Wu to the former emperor. She and her mother were enslaved in the inner palace. However, when she was only 14, she impressed Wu with her beautiful writing and opinions on the affairs of state, and was elevated to be her personal secretary. Emperor Wu consulted her on all imperial edicts, making her China’s first female prime minister at age 27.

She was a close ally of Emperor Wu’s daughter, Princess Taiping, an intelligent politician in her own right, and some have speculated that the two had romantic relations outside of their official marriages. The two of them had a hand in deposing Emperor Wu and elevating her son, Emperor Zhongzong who Wan’er was consort to, to the throne. She was later killed in a coup.

In recent years, archeologists discovered her tomb and revealed that Princess Taiping wrote her epitaph-lamenting that Wan’er was the greatest talent of their generation and she hopes for her to be remembered for thousands of years.

婉平之交 (Wan and Ping friends) has been coined as a term for two women who have an intimate and trusting relationship.