Ryusei has already made it clear that he hates you. And you hate him too. In other words, you are enemies.

But he can't deny how much he wants you and your entire body, if you know what I mean.

Currently you two are arguing (as usual). He's making fun of you. Always having a slight smile of satisfaction to make you even more irritated.

"You look cute trying to threaten me." He chuckled as he said this.