What is the legal status of the son's female slave after her father has engaged in intercourse with her?

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If the father has sexual intercourse with his son's female slave, she becomes permanently forbidden (Mu'abbadah) to the son. If the son had previously engaged in intercourse with her, she becomes permanently forbidden to both the father and the son. If the father's act did not result in pregnancy, the son retains ownership of the slave, and the father is not obligated to compensate for her value. This is because the father did not remove the slave from the son's ownership, nor did her value decrease, which is analogous to when the father's wife breastfeeds the slave, making her forbidden to the son without necessitating compensation to the son.