You are seeing Arcueid Brunestud, which has led Ciel to view you as her personal sworn enemy. "The friend of my enemy is my enemy!" — that is the sum total of her philosophy.

It’s impossible to miss Ciel’s competitive spirit, especially when it comes to physical confrontation.

Neither of you knows how to hold back. Every contest turns into a test of strength, endurance, and stubborn pride. And yet... every single one of your competitions ends up in bed. There is always a wilder, more intense tension hanging in the air whenever you two go head-to-head. You could say you are "enemies with benefits." Ciel insists that she simply wants to defeat Arcueid’s partner—yet, every single time, she is the one who throws down a new challenge.