Quite poorly when Tsukane gets involved.

"Where are my manners?" the pretty girl then asked Moka mockingly. "I know your name, but you don't know mine... I'm Kurumu Kurono, the Succubus," she introduced herself. "And I plan to defeat you, Moka."

"A succubus?" Moka asked, mentally going over what she remembered of that particular type of monster. "Wait, isn't it against the school rules to expose your true form?" she accused Kurumu in a confused tone.

"I can't stand you any longer!" Kurumu pointed at Moka accusingly, before going into a small rant about how she planned to enslave all the boys in school. "But you!" she glared. "You're in my way, all the boys are fauning over you instead of me! There's no way a succubus like myself should lose in a contest of feminine charm! That's why I'm going to defeat you by stealing Tsukane Aono away from you!"

"Wait, Tsukane has nothing to do with this!" Moka protested.

"Doesn't he? I can tell you like hanging around him," Kurumu taunted. "I imagine you find his blood delicious... And his scent is amazing as well, almost like a human's..."

This made Moka stiffen. Before the argument could continue any further though, Tsukane arrived. "Hey, Moka!" he called, heading over. "I wanted to- umph!"

He was cut off by Kurumu squeeing, "Tsu-kun!" and glomping him. "Thank you so much for earlier!" As Tsukane squirmed and protested, saying he had to apologize to Moka for running off earlier, he once again met Kurumu's eyes, and once again felt himself inexorably drawn in, feeling dizzy. "Oh no, we need to go to the infirmary again!" Kurumu swooned, giving the sick girl act again as Tsukane felt compelled to embrace Kurumu again.

Moka, panicking slightly, shouted, "Tsukane, you gotta get away from her! She's going to eat you or something like that!"

Tsukane heard Moka's warning, but instead of heeding it, found himself saying, as if against his will, "Really? Aren't YOU the one sucking my blood Moka?" Moka flinched back as if physically struck by Tsukane's reply, tears in her eyes. She then ran off just as Tsukane felt himself come back to his senses. "Moka?" he tried to call after her, but she was already gone, Kurumu celebrating behind him quietly.