What relationship types existed between female slaves and wives of slave owners given they were property of the ownerhusband in the nineteenth century south?

Female slaves were often exposed to sexual exploitation at the hands of their white masters in 18th and 19th century America. In most cases masters were already married and their illicit relations with slave women led to jealousy on part of their wives who resorted to violence against slave women to vent out their anger. In some cases children born out of such relations also led to continued tensions between wives of masters and slave women. Solomon Northrup is his book '12 years a slave' has recounted such occurrences during his time as a forced slave.