Is sexual intercourse after agreeing to khulʿ, but before the khulʿ-seeking woman's menstrual period, considered a sin or zina (unlawful sexual intercourse), and does it mean the wife is returned to the husband's bond?

If khul' (divorce by mutual agreement, initiated by the wife) occurs between a couple, the marriage contract between them is dissolved according to the preponderant opinion. The husband cannot take his wife back during her 'iddah (waiting period), but he is permitted to marry her again with a new contract and a new mahr (dowry), with her consent. If the khul' is effected by its specific pronouncement or by words indicating it, the contract is dissolved from that moment, and sexual intercourse after the khul' is forbidden and is not considered a return (to the marriage). However, if it is merely an agreement without a specific pronouncement, it is not considered khul' and the marriage does not dissolve. Khul' during menstruation is permissible and valid. The woman observing 'iddah due to khul' observes it in her family's home or a separate place, and she does not intermingle with her former husband.