Rikka is a young lady of dogged persistence, I will give her that. The, "That's fine. The Track and Field Club doesn't have any rules against vampires." line had me cracking up out loud.
In his worst nightmares Rin couldn't have imagined how easily Yuu keeps spreading the news of vampirism. How long has it been? A couple of months? Three outsiders already know. Or two outsiders if Nana counts as the immortal lover. It's entirely possible that's as much if not more than the number of mortals Rin ever told about himself during his century of existence.