He had intercourse with his wife when she was making up a Ramadaan fast. What should they do?
Question

                I had intercourse with my wife when she was making up some days that she had missed from the previous Ramadaan, and she was not able to make up all of the days.

 Please note that she had asked me for permission to fast and I had given her permission.
Praise be to Allah.
      Firstly: 

    It is not permissible for a person who has begun an 
    obligatory fast – such as making up a Ramadaan fast, or offering kafaarat 
    yameen (expiation for breaking an oath) – to break that fast except for a 
    legitimate reason such as sickness or travelling. 

    If he breaks the fast – whether that is for a valid reason or 
    not – that fast still remains an obligation that he owes and he has to fast 
    another day to make up for the day when he spoiled his fast. 

    If he broke his fast with no excuse, then as well as making 
    up the fast he also has to repent to Allaah for doing this haraam action. 

    Your wife does not have to offer any expiation, because the 
    expiation is only required for intercourse during the day in Ramadaan. 

    We have previously discussed this in the answer to question 
    no. 49985. 

    Secondly: 

    You did wrong by spoiling your wife’s fast, because if a wife 
    observes a fast to make up for a missed Ramadaan fast, with her husband’s 
    permission, he does not have the right to spoil her fast. 

    You both have to repent to Allaah, regret what you did and 
    resolve not to do it again. If you forced her then there is no sin on her. 

    And Allaah knows best.