Maidservant 侍婢

The maidservant 侍婢 who appears in Lü Bu's 呂布 biography in Sanguo zhi Wei 7, was an employee of the Han dynasty, at that time usurped by Dong Zhuo 董卓.

Biography
The maidservant is mentioned only once in the Sanguo zhi: "卓常使布守中閤，布与卓侍婢私通，恐事发觉，心不自安."

- Sanguo zhi Wei 7; biography of Lü Bu.

Which can be translated as:

"Dong Zhuo (mentioned as Zhuo 卓) ordered Lü Bu (mentioned as Bu 布) to guard to palace doors, but instead Lü Bu went into fornication (私通) with one of the maidservants (侍婢). He now had a guilty-conscience."

Basically Lü Bu's affair with the maidservant was one of many reasons, and not the reason for the tension between Dong Zhuo and Lü Bu. There are no details about the affair; we don't know how long it lasted or if it was (or became) anything more than just an affair.

Family
Unknown. Had an affair with Lü Bu.

Fact vs. Fiction
Historically... References
 * The maidservant was not an (adoptive) daughter of Wang Yun 王允.