Is expiation obligatory for the crime of zina committed during the day in Ramadan, knowing that the perpetrator was not actually praying or fasting, was single, and has repented?

Repentance from adultery during a Ramadan (definition) day is a blessing that necessitates gratitude and preservation, along with seeking forgiveness, expressing remorse, and asking Allah for pardon. Expiation for intercourse during a Ramadan day is obligatory by the consensus of jurists, whether the intercourse was permissible or forbidden, and the sin intensifies if the intercourse was forbidden. One must fear Allah and repent for abandoning prayer and fasting, and make up for what was missed.