Is having anal sex with one's wife after anointing the penis with oil over which (Qur'anic verses) have been recited considered an act of disbelief (kufr), and what must the perpetrator do?

Engaging in anal sex is one of the major sins, and the one who commits it must offer sincere repentance. However, this man has not disbelieved by what he has done, and his intense fear of disbelief is a sign of the sweetness of faith. He should frequently engage in remembrance of Allah (dhikr), seek forgiveness (istighfar), perform supererogatory prayers (nawafil), and pray during hardships.