Wrong again!

"Grr, okay, you're clearly gonna be hard to control, so I'm gonna leave you now!" Vanir declared, shakily reaching up for the mask, but Kazuma acted almost without thinking, and moved forward, slapping the tag onto the mask. "...eh? What the!? I can't get this thing off, my fingers won't even touch it!"

"Huh, didn't actually know if that would work, but it's good that it did. You're stuck in her body for now," Kazuma smirked. "And with her able and more than willing to resist you, you won't be able to use your full power."

"Seems like a short term solution at best though Kazuma," Cremea pointed out.

"Relax, we'll just take him back up to the surface and have Aqua purify him. Her holy magic is supposed to be essentially kryptonite to undead and devils," Kazuma remarked.

"... what's kryptonite?" Cremea asked.

"I'll explain that on the way up," Kazuma shrugged, and they started walking, Darkness overpowering Vanir and waking behind them, albeit struggling to do so.

Ria naturally found Vanir's plight hilarious. "Bwahahahahaha! You guys just trolled a troll, without even meaning to!"

"Oh be quiet!" Vanir snapped.

"Oh, you can see me now?" Ria snorted.

"Of course I can, I'm possessing someone with the ability!" Vanir growled. "Grrr... Young man, take this tag off if you value your comrade's sanity! With this degree of pain, she'll soon go mad!"

"Oh, he's right, I've never felt anything this excruciating!" Darkness said joyously.

"...what is your damage woman!?" Vanir demanded in frustration.

"Yeah... Her sanity was a lost cause long before I ever met her, so it doesn't worry me. Worst case scenario, she breaks from enjoying herself too much, and I fix her with the Sex Note," Kazuma shrugged carelessly, knowing Darkness was up for that plan completely.

"...fine then... It uses up more power than I wanted to, but it was clearly wrong to hold back! Full Control!" Vanir shouted, and Darkness spasmed.

"Wha-!?" Darkness protested, before Vanir suddenly ran past the Kazuma and Cremea, cackling.

"Ha! Now I have complete control over her body!" he gloated as he surged up the stairs.

"Shit!" Kazuma and Cremea shouted at once, in hot pursuit. So much for that plan!