It is not permissible for a master to have intercourse with his married slave woman

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Check below answers in case you are looking for other related questions:
What is a “right hand servant”? Does the owner of a “right hand servant” have to be married?
It is not permissible for a woman to marry her slave, according to the consensus of Muslim scholars

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Related Answers:
Intercourse with female prisoners of war
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What is a “right hand servant”? Does the owner of a “right hand servant” have to be married?
It is not permissible for a woman to marry her slave, according to the consensus of Muslim scholars

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