As the blood finished covering his palm, he brought it down and cupped his groin, then began to chant even as the magic of the ritual stirred him to vigorous life.
Harry was just about to groan in frustration a few minutes later, because all that seemed to have happened was that his erection was, if anything, more painful than ever before and perhaps spurred on by the magic of the ritual, as the room started filling with dense, pink smoke.
Eventually, the almost cloyingly-sweet, yet still brimstone-y smell made Harry cough.
A moment later, he jumped in response to a single word.
"Master?"
He froze, with his right, bloody hand still cupping his swollen scrotum, while the left hand tightened its grip on... no, wait, he'd thrown the knife aside, put his wand in his clothes, also set aside... he was defenseless. Naked, literally, in a room with some unknown female.
Suddenly, Harry felt very grateful for the obscuring smoke.
"Er... Who's there?" he eventually called.
Another brief pause, then the same, soft, almost lyrical voice replied, "It's me, Master. The one you summoned? Let me clear out the smoke... Most of these rituals are done out-of-doors, you know."
"Er..." was all Harry could think of to say, heedless of how inane it sounded - especially repeated - as the heavy color seemed to withdraw, condense and shrink, eventually revealing at first a small shadow of a form just a few feet in front of him, on the opposite side of the ritual circle.
It continued to pull inward, almost swirling down into a central point, condensing further and further, until the last few wisps were pulled into what seemed to be the hair of a petite, humanoid girl - though clearly not human - about two feet shorter than he was.
Harry was not, for what it was worth, a tall example of an English teenaged boy, at a mere five-one.
She - for the being was clearly a she - had pointed, almost elven (though thankfully not house-elven), ears, bright pink hair the exact hue of the smoke it had just, apparently, absorbed, and a rounded, almost angelic human-like face with bright, almost cerulean-blue eyes. A slender, graceful neck fell into narrow shoulders, from which sprouted two arms, and, apparently, two small, black, bat-like wings which jutted out and upward about a foot in each direction.
Her chest, bare as the rest of the figure was, was at least partially developed, though he doubted if, were she human, more than the smallest of training bras would ever be necessary. Not that, of course, he was an expert on the matter.
The small breasts were capped by puffy, extended areolae and nipples, and there was just enough definition going down from there for Harry to make out the curvature of the abdomen, a hint of waist and pelvic bone, before a bare, slitted mound separated two thicker thighs, giving the short creature a slightly wider hip than shoulder, which was again a little wider than the waist, before moving down to proportionally well-made but still short legs to end in two miniature, perfect feet.
Feet which, Harry noticed, were capped with pointed, likely razor-sharp nails the same hue as her hair.
"Er... you're... small?"
The being nodded, dazzling Harry momentarily with the sheer excitement she presented with the gesture and the brilliance of her white teeth - two of which were, he also noted with some trepidation, almost vampire-like in their length.
"That's right, Master! Like all Succubae, I take the form of my summoner's deepest desires!"
"I... I'm not into little kids," Harry protested, suddenly annoyed, frowning as he did so.
"Your big cock says different, Master," the creature chided, glancing downward - just below her throat level - momentarily, "And besides - I'm not a child, I'm just young! Petite, you might say."
"B- But you're so short! I'm short, and you're- you-"
"Mm, not short where it matters, Master," the child-like being smirked, stepping forward a few times until she was just a few inches from him.
Instinctively, he stepped back, only to bounce off the invisible, yet perfectly there barrier formed by the inside of the summoning circle.
Shit. Neither of us can leave until the ritual is over. Crap, crap, crap... What did I get myself into?
"Don't feel too bad," the being shrugged, "I don't really have anything to compare it to. I'm fully trained, and an adult by our standards, but you're my first summoning, so I've never had a human to compare you to. And besides..."
The sultry look - altogether alien to what Harry felt should have been a child's form - she shot upward made Harry's penis jerk in his hand, such that, only then, did he think to try and hide it from her.
"... You should know, Master, I'm a Succubus. A demon of sorts, at least to you mortals. There's nothing - nothing - you mortals could think of, sex-wise, that would shock me. So you like petite girls. I might be a year younger than you, appearance-wise. I can only assume your tastes will change as you age, like most people's do. And so, should our contract extend to that point, I will, too. But to me, this isn't a big deal. Not at all."
Harry frowned. "C- Contract? The book didn't say-"
He trailed off. She, in turn, cast her almost glowing-blue eyes around the chamber, which was still only lit by four candles and the remaining glow of the circle itself (a white, at least, which kept colors almost normal, Harry knew), to see the small pile of his belongings. With a brief squint, she eyed the book, then rolled her eyes. "Profligatory Vitalis by Luther Profligulls. I should have known, it's a book with all the warnings and cautions after the good stuff. We actually use that same book in our lessons on Contracts. Don't feel too bad... I'm fair, I promise!"
"Er..."