Word

洋妾

ようしょう
Westerner's mistress
Word

一盗二婢三妾四妓五妻

exp
いっとうにひさんしょうしぎごさい
most thrilling relationships for a man (another man's wife, a maidservant, a mistress, a prostitute, and finally his own wife)
Word

妾奉公

めかけ奉公
めかけぼうこう
serving as a concubine