God, we're in a fantasy-romance novel

Eleanor and Juliet, pitiful siblings who woke up and realized they were somehow transported inside the fictional world of a famous fantasy-romance novel, one they have recently read together. But that's not the strangest part, they received a letter from God and were given roles to fulfill. The elder had to be the villainess and the younger had to be the female lead's best friend. Though, there was one inevitable problem, why did the female lead and male leads have to fall in love with them?!