What is required of one who experiences a wet dream after the Fajr prayer during the day in Ramadan, and semen is discharged with desire?

If you caused the emission of semen by an action, then your fast is broken, and you only need to make up for that day. However, if the emission of semen was due to thinking about desirable things, then your fast is valid, and you do not need to make it up according to many scholars, contrary to the Maliki school of thought. The basis for this is the hadith: "My Ummah has been forgiven for mistakes, forgetfulness, and what their souls whisper to them, as long as they do not act upon it or speak of it."