She smiled again, "Anyway, so here's the short version. I can only stay in this world, outside of this circle, for a short time. About an hour, tops. With a Contract, as long as you keep your end of the deal, I can keep mine - which means I can stay. The payments - what you give me - can be almost anything, but I know exactly what I want. It's a pretty standard thing, too, most Succubi these days choose it."
"Let me guess," Harry frowned again, finally having found his words, "My soul? My life?"
She almost snorted, covered her tiny mouth with a small hand, giggled once, then shook her head, making her wings jostle. "No, silly, it's semen. That whole soul-sucking, life-stealing nonsense was your religions getting into the mix. 'All sex is bad, especially outside of marriage'. What a crock! It's stories told to scare people off of summoning us. I mean, I can kill. I can't remove a soul. Short of killing, anyway. But where's the fun in that? Where's the payment? Nowhere, I tell you! I mean, I-"
Harry's frown came back. What was she going on about?
Demons - Succubi in particular - didn't take souls?
Of course, he'd been willing to maybe trade his for the benefit. That was the whole point of the summoning! But now this tiny thing who was way too young - words to the contrary notwithstanding - to be talking about sex at all was... was...
"-And that's why, now, we mostly just take semen. I mean, we can't breed alone, but we can take a mortal's semen - or fluids and eggs in the case of a humanoid female and an Incubus - and use them as building blocks for our own people."
"Wait... what?"
She, now, frowned slightly, glaring up at him before sighing, which made her wings flex far enough up to almost bring the taloned joints together as her little shoulders rose, "Semen. Cum. Jizz. Whatever you want to call it. Succubi need it to make more Succubi. We can 'eat' it, absorb it into our bodies in any way it touches us - internally or externally - and use it to get stronger. Then, when we go back home, we use the raw material - essentially blank DNA and amino acids - to make more of us. So that's my payment. Uh... details to be worked out, of course. I just want semen."
Harry shook his head. It couldn't be that simple, could it? There had to be... "What's the catch?"
She shrugged. "None, really. I mean, there's no way you - even as studley as you might be for a fifteen-year-old - could provide enough to keep me here. But, I sense teenage boys all over this place."
"It's a school," Harry offered.
She grinned, now, all traces of annoyance gone, "Perfect. That's more than enough, then. So, here's what I propose and feel free to offer a counter-proposal. You, as the Contractor, can use me as you see fit, whenever, where ever. Whatever hole, whatever method, I'm your servant until the Contract ends. Even if it's not sex-related. With me so far?"
Harry nodded, his dick, which had only just started to wilt the tiniest bit, flared back to full-mast at the very idea of having this creature, which apparently was truly a succubus, even if her form was not traditional, at his beck and call.
"You cannot banish me until a certain task is complete, a task of your design. This is the task which the Contract will be made to uphold. If payment is not made in kind, I can leave - and take you with me. Which means you'll basically be fucked dry by me and all of my kind until there's nothing left. You won't enjoy that as much as you might think. It usually takes about five minutes."
Harry, at first aroused even further by that idea, shuddered.
Maybe not, then.
"As far as payment itself... I want your semen, as Contractor, at least weekly. That's for my own personal use and power. That means you have to use me, put your semen on or preferably in me, at least once per week. Once per day is preferable, but I have the feeling you'll have other... obligations keeping your time pretty tied up. In addition, you don't complain when I take semen from other places in the school. Or at home, if you're there, for as far as I can find it. A couple miles."
"Er..." Harry turned slightly green, "You mean, if I was at home, you'd... you'd, er, th-that w- with my cousin? My uncle?"
One thin, pink eyebrow quirked up. "Not if you don't want me to, I suppose. I can skip them. And no, I mean, if you want me to suck or fuck someone's semen out, just tell me. It is in my nature. But I meant more just gathering what's shot out. We have ways of getting it out of females without them even knowing, or getting it off bedsheets, or socks, or whatever else. It doesn't have to be fresh, it's just better if it is. Tastier, I mean, and stronger, too."
Feeling slightly better about the situation, Harry nodded. "Anything else?"
She grimaced, "Well... let's see," then started tapping a dainty finger on her chin, looking down absently near his belly-button, uncomfortably close to the tip of his member, "My personal payment, the wider payment to keep me here and build up our world... It's your turn, I think. Tell me, Master, what you want. Besides me, of course. What is your end goal?"
Harry frowned yet again, stymied. His first thought, of course, was help with Voldemort.
Yet this, even if she professed to be an adult, was apparently a child. He couldn't throw her into that!
Harry started glancing around, hoping for inspiration.