All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
We have already issued Fatwa 115698 clarifying that it is permissible for a husband to kiss the feet of his wife as a way of foreplay.
As regards stepping on your husband with your feet while wearing shoes, then this is against the proper manners and it contradicts the Fitrah (natural disposition upon which Allaah created mankind). It is known in the customs of the people that such an act is for humiliating the person in addition to the harm that this may cause to your husband. Therefore, you are not obligated to obey him in this regard, and if this act causes harm to him, then it is even more confirmed that you do not have to obey him. Indeed, it is confirmed that the Prophet said: “There should be no harm nor reciprocal harm.” [Maalik, Ahmad and Ibn Maajah]
Verily, obedience should be only in what is permissible as the Prophet said: “Obedience is required only in what is permissible.” [Al-Bukhari and Muslim]. Indeed, this conduct cannot be considered permissible.
Allaah Knows best.