Consent In Physical Relationship With Concubines
First of all, it must be understood that Islam has closed the doors for slavery. At this time there is no room according to the sharia for holding anyone as a slave or a concubine. For details, please see: Discussion 30330 Secondly, consent in anything with someone being held against their will to begin with is not very intelligible.
Abu Sa’id Al Khudri said “The Apostle of Allaah(ﷺ) sent a military expedition to Awtas on the occasion of the battle of Hunain. They met their enemy and fought with them. They defeated them and took them captives. Some of the Companions of Apostle of Allaah (ﷺ) were reluctant to have relations with the female captives because of their pagan husbands. So, Allaah the exalted sent down the Qur’anic verse “And all married women (are forbidden) unto you save those (captives) whom your right hand posses.” This is to say that they are lawful for them when they complete their waiting period. Sunan Abi Dawud 2155Chapter 711: Regarding Intercourse With Captives, Book 12: Marriage (Kitab Al-Nikah)https://sunnah.com/abudawud:2155