As Lucifer was stripped of his titles, we found out that he was never influenced by the humans. He created deciet and became the Father of Lies. We were all decieved into going against our creator, we were broken. Never in the time that we existed did we think that we would tricked by our fellow Angel. We watched as Lucifer's six wings were removed and he was thrown to Hell, where he would rule over the human sinners that he influenced to go against God.
Being the forgiving creator that he was God only removed our wings and cast us to the world of Humans. Wallowing in our dismay some decided to pair with humans and have children. Their children had become an offense to God since they were mixed with mortal and immortal blood, incurring His Angels to wipe them out. Though their bodies were destroyed, they still had their spirit. Those Spirits became Demons that followed in Lucifer's path towards Hell where they would rise from and plague humanity with their temptations.