Will God accept my friend's repentance after he engaged in oral sex and watched pornography, knowing that he has repented and changed his life?

If a person repents with sincere and genuine repentance, Allah will accept his repentance and forgive his sin, no matter how great it was. This is based on Allah's saying: "Say, 'O My servants who have transgressed against themselves [by sinning], do not despair of the mercy of Allah. Indeed, Allah forgives all sins. Indeed, it is He who is the Forgiving, the Merciful.'" And based on the Prophet's (PBUH) saying: "The one who repents from sin is like one who has no sin."

Therefore, he should turn to his Lord, have a good opinion of Him, reform his deeds, perform many supererogatory acts of worship, conceal his sin, and not inform anyone of his deed.