Draco naturally began cultivating after he learned the Cultivation Method. It wasn't like he was going to sit there and beat his meat off to the esoteric words, now was he?
However, Demonic Cultivation was special.
One could not use just any form of energy, it only worked with be raw Demonic Energy produced in their various Hell Realms to change into Demonic Qi.
Of course, the energy the Dao Source emitted was perfect for this, which was why the Demon Gods were hogging it to themselves. Draco sat down and operated the Holy Demonic Record, opening himself up to the energy.
Since this Cultivation Method was derived to fit the Martial Spirit World standards, his Demon Martial Spirit manifested behind him and smiled before pulling in torrents of this energy.