"Three minutes, Master," Harry was distracted only slightly by Lilith's coo in his ear, "longer than average, at least, and still going strong... but your virginity is lost, now. I want your semen. If you come in her, I have to eat it out of her. So get her off and then let me finish you, hmm? It wouldn't do to let her know about me just yet."
The succubus grinned internally. It wouldn't make much difference, in the end. She could either alter the girl's memory of the evening to make it be Harry who had done that deed, or just erase that part completely. But she wanted him directly.
"No," he murmured, then returned his attention to the task at hand momentarily.
The girl's eyes were starting to roll back in her head, the hand on his neck starting to slip.
"You," he slowly turned his eyes from that magnificent sight to the petite succubus at his side, "I'm going to get her off while you get me off. Lay on the floor, I want to be in your mouth again."
One rose-colored eyebrow quirked up, but Lilith smiled. "Alright, Master, as you command."
Without further hesitation, the succubus crawled under the table and positioned herself so she was facing Harry, then rolled over onto her back and opened her mouth.
"Hey," Harry grunted, trying to get the girl's attention, "I'm getting close. I can't have a kid yet, so I have to pull out."
"D- Don't- s- so close-" the girl moaned.
"I'll finish the job, don't worry," he smirked, unsure whether it was bravado or sheer willpower to do so, but somehow, he forced himself out of the delicious embrace of her vagina, then dropped to his knees.
A moment later, Lilith's long tongue was wrapping around him, laving all the juice left from the girl off of him, then moving down to do the same with his scrotum, and even down the insides of his thighs. She must have been flowing!
Then Harry looked up just in time to miss the succubus finishing that job. Instead, he leaned forward, bringing his mouth up to the girl's blonde-haired slit, puffy and stretched wide from arousal and his recent inhabitation, and oozing just the thinnest trail of blood. She smelled strongly of... something, something besides iron and copper. He couldn't quite put his finger on it, but he knew right away that while strange, he loved the odor. It was familiar, yet unknown. Tangy, yet sweet, and a bit savory, too.
He had to taste it!
But first, Harry moaned in ecstasy as, once again, Lilith's mouth, both wetter and hotter, if not quite as tight as the Slytherin's pussy, engulfed him up to the half-way mark before beginning to slide up and down, with the long, strong tongue curling around to finish the job.
If the girl found the pause annoying, she made no clue as, just a moment later, Harry's tongue found its way into the gaping hole he'd left, even while his hands sought out the tiny bud that he suspected was the 'good spot' spoken of in hints and whispers by mostly upperclassmen.
Her body jerked as his tongue thrust in, and again when his hand found the little bud. "Merlin, yes," she cried, voice both sultry and rough.
Must be doing something right, then, Harry found himself thinking, even while he was distracted by the mouth on his cock below the table.
Still, he knew Lilith was going to get him off. She'd done so once already, and he was so very close. Within just a few seconds, probably, he'd... yes, here came his orgasm now.
But the girl... he wanted there to be more!
It couldn't be just the once. He wouldn't let it!
Somehow, knowledge flew into Harry's brain that should not be there.
His tongue, obeying the imperative delivered to him by himself - and whatever else - withdrew, moving upward, switching places with his fingers, the longest two of which punched into the girl and curled up toward the back of the same bud, which he also knew, somehow, to suck lightly between his lips even while running his tongue over the bulge.
Even as he grunted out his own earth-shattering orgasm into Lilith's eager mouth, the vibrations down his tongue and the pressure from his lips, on top of the twining, seeking fingers inside her, caused the girl before him to shriek in her own orgasmic bliss, lifting her hips off the table, back arching up so high he feared her spine would snap, as she keened to the ceiling of the Library.
Once again, Harry's mind filled with white.
A few seconds later, it was gone. His eyes moved down to see Lilith idly holding his half-erect penis between two fingers while licking it clean, occasionally putting the very tip to her lips and giving the hole a little suck. "Satisfied, Master?" she winked saucily, then gave him a little tug before scrambling - altogether too gracefully, he felt, for such a child-like figure - from beneath the table.
Slowly, he fought his way to his unsteady feet.
The girl was staring at him through half-lidded eyes, still breathing heavily, apparently unashamed of her mostly naked form, which was still only covered by the bra around her stomach, and the tie which only lay around her neck, and now tangled within the long hair.
"That was... pretty good," Harry blushed at his own moronic-sounding words.
The girl snorted quietly, "Better than 'pretty good', Potter. But you'd better not go spreading it around, or I'll hex you so bad your grandparents will feel it."
"I won't," he promised, meaning it this time as opposed to the previous, when he still felt like he'd mostly been saying it just to get her to agree to shag him. "I... I can't, actually. I don't- I don't know your name."