What would be a NSFW spell from Harry Potter?

Hermione and her Time Turner

She withdrew behind her bed curtains again, absentmindedly renewing the Silencing Charm and chewing on her lower lip as she thought her idea over. How would she work it? Who would go first? How long would it take? Was this even a good idea? She had just decided when a warm weight suddenly settled on top of her, lips finding hers.

Oh, yes, this is a perfect idea. Her eyes slid closed as she hungrily returned the kiss, hands rubbing down her visitor's back, eliciting quiet whimpers. When hands stroked over her breasts, Hermione moaned in delight. She moaned again when a tongue entered her mouth, sliding over her own, bringing with it a salty taste that was at once alien and familiar—and enticing.

Hermione broke the kiss and rolled both of them over, pinning her visitor to the bed, and kissed down her jaw to her ear. “How is it?” she asked in a whisper.

“The part you're about to go through is maddening,” her own voice replied, “but judging from the reaction I saw, it'll be well—mmmmm.” Hermione had drawn her visitor's—her own, really—earlobe into her mouth, tickling its underside with her tongue. She began kissing down her counterpart's neck, nibbling by her collarbone and enjoying the slight gasp she got in response.

“I'm not really sure—”

“Don't worry, you'll do fine. Just do whatever comes to you.”

So Hermione continued her line of kisses, tracing her visitor's collarbone and then between her breasts. When she started tracing the bottom of her counterpart's breast with her tongue, the woman under her whimpered in frustration. “Please...every second you tease me is a second you'll be teased...”

“But I like being teased,” she answered.

“Not this much...”

She took pity on herself, drawing out a moan by kissing a stiff nipple, but only briefly. Instead, she sat up and reached to the pillow beside her visitor's head, picking up the quill.

Hermione grinned wickedly and her counterpart's eyes widened. “You know what I'll do if you don't stay still and quiet through this...” The woman nodded curtly and rested her head against her pillow, trying to relax, trying not to react...

Hermione dragged the end of the feather down her visitor's cheek and across her lips, then down her jaw, finally retracing the path her mouth had laid down earlier: down her neck, along her collarbone, between her breasts and below one...

Sweat was starting to appear on her counterpart's body as she fought to follow the instruction. Hermione heard a gagged whimper as she dragged the feather in circles on her visitor's breast, but decided to ignore it. If she couldn't stay quiet now, then when the feather reached her nipple...

The woman shuddered under her, moaning loudly enough to wake the entire tower, were it not for the Silencing Charm.

Hermione gave her counterpart a sweet smile, then turned around. Pinning a leg down with one arm, she tickled the visitor's foot with the feather.

The shudders were certainly much stronger, and the laughs nearly as loud. Hermione unexpectedly found herself moaning as her counterpart bucked against her, writhing against her nub. Somehow she kept counting out the seconds; sixty of them passed all too quickly, and she dropped the quill, waiting while the woman's panting slowed.

The sweat on the visitor's body was now visibly beaded; a few drops slid into her belly button as her breath calmed “You're...going to...wish you didn't do that,” she said.

Hermione smiled as she leaned down and licked those drops back up, tasting a hint of chocolate—a remnant of the soap from her bath earlier. Her counterpart let out a shuddering breath.

“Not even with what comes next?”

“M-maybe then...”

Hermione bent to the visitor's breasts and took the time to delicately lick every single drop of sweat. By the time she was finished, her counterpart's chest was heaving again. Hermione glanced up at her own face, eyes lidded and slightly glazed. “Now, or I'll hex you into next Tuesday.”

Hermione knew herself well enough to know that she was both serious about the threat and perfectly capable of making good on it. She slid down her counterpart's body, pressing kisses into the soft, warm flesh— I never realized my skin was so smooth—and finally reached her folds.

Her visitor's excitement was visible, even her thighs shiny with moisture. Hermione brought her head down to taste it, but a growl above her and hands in her hair guided her elsewhere.

Well, if you insist... Her tongue found the spot.

“Oh, yes...”

Whimpers and moans eked her on as Hermione used different patterns, different pressure, different rhythms. When she charmed her wand and slid it into her counterpart, the moaning woman started rocking back against her. She followed every choked request for “bigger” or “harder” or “faster” or “more vibration”, until her visitor was moving spastically, unable to speak—but still hadn't come.

“M-m-m-more...” she managed to choke out.

Hermione couldn't think of a way to give her more. Unless...

Hermione removed the wand, ignoring the resulting groan, and silently charmed the quill. It floated up her counterpart's body and brushed across her nipple.

The first orgasm came at that moment. The visitor pulled Hermione's head against her, wrapped her legs tightly around Hermione's back, and let out a scream that must've tested the limits of the Silencing Charm.

The second came when another quill floated from the trunk behind them and did the same to the other breast. She'd timed it just right—she was just coming down from the first.

The third came when the wand reentered her, and the forth came when it started moving. The fifth came when the vibration started again, and the sixth and seventh were brought on when it hit just the right spot.

Hermione let her counterpart down gently. When she had dropped the spells (except the Silencing Charm), cleaned her wand, and put her counterpart's Time Turner back in its compartment, she slid back up her visitor's body and nestled against her side, cuddling.

“Thank you...” the visitor whispered.

Hermione gave her a long, slow kiss before pulling the blanket around them. “I figured I'd get the favor returned.”

Her counterpart chuckled. “You will. Drop the Silencing Charm and leave on the second chime. One turn...” Her eyes closed, and she drifted off.

After dropping the charm, Hermione rested her head on the other her's shoulder, thinking about this situation—about the magic involved, about the metaphysics (was it sex or masturbation?), about how frustrated she was after an hour of this. The first chime of the school's clock took her by surprise, but by the second chime she was kneeling over her counterpart, reaching for the Time Turner, twisting it...

...and kissing a new “herself”.

/r/AskReddit Thread