Is it permissible to pray two Rak'ahs after every obligatory prayer without adhering to the regular Sunnah prayers?

The ruling concerning supererogatory prayers (nafila) after each obligatory prayer differs. Supererogatory prayers after Fajr and Asr are prohibited, as the Prophet, peace and blessings be upon him, said: "There is no prayer after the Fajr prayer until the sun rises, and no prayer after the Asr prayer until the sun sets." As for the supererogatory prayers after the other obligatory prayers, they are confirmed Sunnah (Mu'akkadah), and they are ten rak'ahs: two rak'ahs before Dhuhr and two after it, two rak'ahs after Maghrib, two rak'ahs after Isha, and two rak'ahs before Subh. One should adhere to them as they are part of the Prophet's guidance, peace and blessings be upon him.