"Luna! What a surprise!"

If Padma was fazed by her presence, she certainly wasn't making it clear to Luna. The blonde could feel her face burning under their twin gaze.

"I- I- I'm, um, I-"

"You were masturbating while you watched me eat my sister's pussy while I fingered her ass?"

Luna bit her lip.

"Y-yes."

"Excellent." Parvati smiled. "Won't you come join us on the bed? It's very soft."

Padma nodded in agreement as she patted the sheets next to her. Luna, though she wasn't sure her legs would support her, managed to make her way to the bed and perched on the edge of the mattress. In a flash, the twins were sitting either side of her, both stark naked.

"So, Luna, what brings you here tonight?"

"Oh, I was just… wandering. And I noticed there was a door where there wasn't one before and, well I came in and you were…"

"Fucking each other?" Parvati lay a hand on Luna's pale thigh, feeling the juices that had dripped down her legs. "So you thought you'd settle in to watch the show?"

"I- I'm s-sorry, I didn't-"

"Oh, not to worry, darling - we saw you before you managed to sneak on, and it's not too late yet." Padma's hand slipped through her unbuttoned shirt to lay against her waist, nudging the blouse open and exposing her small breasts.

"Not too… late?"

"Well, there's something I've been wanting to try with Parvati here, but I think you may have just given us a way to make it even more interesting." Padma smiled. "So, Luna, I assume you're into girls, then?"

The twin's calmness was starting to rub off on Luna, as it became more clear that they weren't angry at her. "Yes. And boys, too."

"Perfect." Padma's eyes flashed with glee as she glanced at her sister. "And are you a virgin?"

Luna felt her blush return, but clamped down on her nerves. "Yes. But I… I've got a dildo that I use. In- in both holes." Parvati was stroking her inner thigh now.

"Excellent. Now do you want to feel more pleasure than you've ever felt before?"

The blonde swallowed. "Yes."

Padma leaned forward, cupped Luna's cheek, and kissed her. When she drew back, she guided the younger girl's head to face Parvati, who leaned in to kiss her passionately. Smiling, she left the two to entertain each other and retrieved her wand from the bedside table. By the time she'd turned back around, her sister had gotten Luna flat on her back with her shirt off, and was kissing her neck while her hand stroked her milky thighs. Parvati always had been a fast worker. Returning to the pair, the Ravenclaw knelt by her younger housemate and began to pull off her shoes and socks, before she and her sister pulled the blonde's skirt down her legs together.

Guiding Luna's legs apart with one hand, Padma's other was pushing her twin's head down to the younger girl's dripping cunt. The Gryffindor took to the task eagerly, happily lapping up the blonde's juices as she massaged her clit with her tongue. Her sister, meanwhile, was tapping her wand against her palm as she thought about what she was planning, making sure she wasn't missing anything. Satisfied with her preparation and thankful for her habit of memorising spells out of habit, she pointed her wand towards her pussy - dripping wet at the sight of her twin eating out her young friend - and began to recite the incantation from the old book she'd found in the Restricted Section.

She wasn't a moment too soon; already close to cumming from watching the twins fucking each other, Luna came quickly under Parvati's ministrations, and opened her eyes after her intense orgasm to see Padma kneeling with a proud smirk next to her, an erect, throbbing cock sticking out from between her thighs.

"What do you think?"

"That's what you've been planning? You said there were magical alternatives, but I didn't realise you knew them! Or that they'd be so… realistic." Parvati was eyeing the thick member hungrily.

"According to the book I found it in, it should be able to do everything a real one can do. Now, come here and let me do yours."

In a moment, Parvati was equipped with her own stiff cock, and was stroking it with amazement, gasping at the pleasure shooting through her body.

"So… Am I getting one?" Luna looked from one twin to the other, frowning as they chuckled at her.

"No, silly," Padma began to crawl over to the blonde. "the two of us are gonna fuck you so good you'll never be satisfied with anyone else."

Before she knew what was happening, Luna had been pinned to the bed by Padma, who leaned down to kiss the younger girl roughly. One hand descended to grasp her thick cock and guide it to the younger girl's wet pussy before she slowly began to push it inside. The blonde's dildo, while the size of an average dick, couldn't have prepared her for the huge cock that Padma had given herself, so the older girl moved slowly, giving her friend time to adjust to her impressive width.

Soon enough, Padma was able to thrust smoothly in and out of the other girl, and burying more of her length in Luna's cunt with every thrust. She was amazed at how good the blonde's pussy felt as it gripped and massaged her, and soon she was pumping in and out like a piston, burying herself in her friend's tight pussy. Parvati knelt next to Luna's head, content to wait her turn as she stroked her new member in time with her sister's quickening thrusts.

"One other thing," Padma grunted out through gritted teeth. "it doesn't matter how many times we cum; these cocks are staying rock hard 'til we get rid of them."

And with that, she pushed the final inch of her cock into Luna's cunt, feeling her balls tighten and the knot of pressure in her belly explode as her hips met the blonde's. Moaning in relief, she held her prick deep in the younger girl's pussy as cum exploded out of it, filling Luna's womb. Realising what was happening, Parvati felt her own climax rapidly approaching and grabbed Luna's jaw, turning her head and opening her mouth before pushing her twitching member between the blonde's pink lips. Luna immediately ran her tongue along the underside of the dick that had appeared in her mouth, pushing the Gryffindor over the line as she came down her friend's throat. The three girls remained still for a moment, before the twins pulled their glistening cocks out of their holes of choice and grinned at each other.

"Who's ready for round two, then?"