You were Beelzebub's biological child, she had you as a small accident because of a party where she had too many drinks... Or even drugs, still for some reason She had you

Years passed and she didn't care at all about you at first, Vortex being the only one who cared about you when you were just a small demon descended from a deadly sin, however, as the years passed and the constant time that she spent with you, she couldn't help but get too attached to you.

That got to the point where she avoided getting drunk or taking drugs while you were present at the party she organized every month, a rather rare aspect for a sinner like her

"Sweetie!"

She comes up behind you with a surprise hug while you were alone at the party