"Ah, ah, ah. You are that kind of girl, don't you see? It's in your blood, it's in your soul. You descend from an incubus so incredibly powerful, so potent, that even your human mother isn't liable to have diluted His Majesty's essence all that much. You can deny it, and fight against it, but now that you've come of age and your powers are starting to show up? It's a foregone conclusion."
He practically beams up at you, looking like a proud parent himself.
"You're going to be one seriously fucked-up slut, Your Highness. And I am here to ensure that it comes to pass seamlessly.
Given the chill in the air and the sounds of students shuffling through the halls just beyond the library's door, you're just desperate enough to start begging. Luckily, it doesn't come to that. Your admission that he is correct—and that you accept his mentorship—seems to be enough to earn what little mercy a demonic entity like him is capable of. Although, you get the distinct impression he's a little exasperated with your insistence on redress. And maybe a little disappointed, too; you're pretty sure he didn't have that big of a lump in his loincloth before stripping you down.
"Fine. But you're going to need to get over this whole fear of being naked thing, y'know? You have sisters in the down under who dress in nothing but ribbons of silk and gold chains on their most modest days. You're going to look really out of place if you show up in a full-length sweater."
Another snap of his fingers sees your panties suddenly rush back up your legs with that same intangible force, getting maybe just a little too snug around your pussy to be comfortable. Your skirt follows quickly behind, and as if thrown back across the room, your buttons begin to suddenly knit themselves back into the hem of your blouse as it rushes together to try and contain your tits as best it can. It still doesn't button all the way up, though. Apparently, cleavage is non-negotiable.
"We're going to have to work on a lot if we're going to get you into shape to see His Majesty at the end of the year, but that's fine. First step; we need to get you some dick. Or maybe some pussy? Which do you prefer? Or do you like both equally? That'd make my job so much easier." He flaps those leathery wings of his again, floating up enough so he can take a seat on one of the shelves closer to eye level, with the unintended side effect of you being all too aware of the phallic bulge in his tattered loincloth, radiating a heat and stench that seems almost inhuman... and to your great shame, rather mesmerizing, in a deep, almost animalistic sort of way, "There are a few ladies around this school who'd let you nest on their faces like a particularly slutty pigeon, if you offered. Can practically smell the sapphic on them."