The Bible does talk of the fallen angels sinning by leaving their proper domain to mate with human women and have children with them. Angels are meant to be spiritual and ethereal, to be above human passions, they are menat to enjoy godly love but not carnal romantic/sexual love. Then you have romantic fictional stories of angels falling in love with the mortal persons whose guardians they are meant to be, these stories can be very sweet and heartaching when the angels makes the choice to give up his or her place in heaven and suffer as a mortal human being to be with man or woman he or she loves, but the truth is God's lov is the ultimate, best most sweetest form of love, and angels enjoy the glorious, pure agape in heaven, why would they want to give that up? I try to understand why it is a sin for an angel to marry a human woman, even if he is truly in love with her, God created Adam and Eve for each other, and the angels to serve and love him.
When Lucifer rebeled he was angry and jealous of Adam, God's human creation. I think Lucifer felt God id not love him and the other angels as much when he created the first man, this new creation would take God's love away from Lucifer and the fellow angels. So Lucifer was jealous, and refuse to acknowledge Adam like the other angels did. God put him in "time out" He sent him to the earth and told him to repent if he came back. Lucifer got even angrier while on the earth, and he went back to heaven and strirred up one-third of the angels against God. With the one-third of the angels following him he rebeled against God and tried to take over heaven. Lucifer lost this war, and was throne back down to th earth, this time below the earth in hell. The angels that followed him, and Lucifer who changed his name to Satan, developed mortal bodies, demonic bodies.