I'll Become a Villainess Who Goes Down in History, Vol. 2 (novel) — Izumi Okido

Fifteen-year-old Alicia is determined to become a villainess who can wield magic with enough skill to match the power of the heroine! After going back to school for the first time in a while, she’s the center of attention for deceiving the prince. That means she’s doing great as a villainess, right? At least, that's what she thought. When that prince announces that he's not holding back anymore and aggressively begins making his advances, what's a villainess to do?!