Dio Brando (Human)

Dio was planning to poison his adoptive father, George Joestar, while obviously maintaining his image as a perfect and well-mannered son.
One day, while giving his father his "medicine," the very proud father of his son Dio began telling him how much he appreciated him, while Dio forced a smile. But at one point, George said that he would be very happy to see him with a girlfriend if the medicine didn't help and he were to pass away sooner.
Dio, playing his part, told him with an expression of absolute confidence that he already had one and would introduce her soon. After exciting his father and leaving the room, his expression changed to one of disdain. Where would he find a girlfriend? Lost in thought, he remembered you; you were like his casual "friend," though more for reasons of convenience on his part. Anyway, somehow he convinced you, and now you're his fake girlfriend.