Luna led her through a series of corridors Hermione only vaguely recognised, finally stopping at a door that looked like it hadn't been opened in decades.
"What is this place?"
"An old music room, I think. The instruments all went mad in 1847 and had to be destroyed. No one comes here anymore." Luna pushed the door open, revealing a dusty space filled with empty instrument stands and moth-eaten curtains. "It's quite private."
Hermione looked around dubiously. "Shouldn't we cast privacy charms?"
"The Wrackspurts will keep people away. They're very thick in this corridor." Luna pulled out her wand. "But we should clean first. Scourgify."
The dust vanished, leaving the room merely abandoned rather than actively filthy. It would have to do.
Luna was already pulling off her top.
"Wait—" Hermione started, but Luna had moved on to her bra, letting it fall to the floor. Her breasts were small and pale, her nipples pink and slightly pointed in the cool air.
"You should undress too," Luna said matter-of-factly. "It's better with skin contact."
She continued stripping with no apparent self-consciousness—skirt, knickers, shoes—until she stood completely naked, her six-inch cock standing proudly between her slim thighs.
"Hello, Gerald," she murmured, giving it an affectionate pat.
Hermione shook herself out of her stupor and pulled off her own top and bra. The air was cold against her bare skin, making her nipples pebble.
"Lie down," Luna instructed, gesturing at the floor. "I want to be on top."
Hermione complied, the stone floor cool against her back. Luna straddled her immediately, settling her weight on Hermione's thighs. The position put their cocks in close proximity—Luna's brushing against the fabric still covering Hermione's.
"You're still wearing pants," Luna observed.
"I—yes."
"That's fine for now." Luna shifted forward, pressing her naked cock against Hermione's clothed one. "Can you feel that?"
Hermione could definitely feel it—the heat and hardness of Luna through the layers of denim and cotton. "Yes."
"Good."
Luna began to move, rocking her hips, rubbing their cocks together. The friction was maddening—too much and not enough at the same time. Hermione's hands found Luna's waist, steadying her, encouraging the rhythm.
"This is nice," Luna said dreamily. "Gerald likes you."
"Gerald—ah—seems very friendly."
"He is. He's very social." Luna's movements grew more urgent. "But this would be better without the pants."
She reached down and unfastened Hermione's jeans with nimble fingers, tugging them down along with her knickers. Hermione's cock sprang free, slapping against her stomach, and Luna made an appreciative sound.
"There we go."
Instead of resuming the grinding, Luna wrapped her hand around Hermione's shaft. Her grip was firm, her strokes confident, and Hermione's head fell back against the floor.
"Luna—"
"Shh. Let me help you."
She stroked faster, her thumb swiping over the head on each upstroke, spreading the precum that was leaking freely. Hermione writhed beneath her, her hips bucking into Luna's grip, the pleasure building rapidly.
"I'm going to—Luna, I'm close—"
"Come for me," Luna murmured.
Hermione came with a cry, her cock pulsing, ropes of white splashing across her stomach and breasts. The orgasm crashed through her, leaving her gasping and trembling.
Before she could catch her breath, she felt her cock twitch—and begin to harden again.
"Oh," Luna said, sounding pleased. "Gerald does that too. We get hard again very quickly."
"I… uh," Hermione managed. "I don't know why it does that. Just that it does… sometimes."
"I know. It's very useful for multiple rounds." Luna shuffled forward, bringing their cocks together. "Your turn to help me?"
Hermione reached down, wrapping her hand around Luna's shaft. It felt different from her own—slightly shorter, differently shaped—but the feeling was familiar. She stroked, matching the rhythm Luna used with her.
"Like that," Luna breathed. "Yes, just like—oh—"
They fell into a mutual rhythm, each stroking the other, their breathing growing ragged. It was intimate in a way Hermione hadn't expected—Luna's pale eyes locked on hers, their bodies pressed close, pleasure building in tandem.
"I want to try something," Luna said. "When we're close—push them together."
"Push what together?"
"Our cocks. I want to feel you when we come."
The idea sent a spike of heat through Hermione's belly. "Okay. Yes. I can do that."
They stroked faster, chasing their peaks, and when Hermione felt herself tipping over the edge, she pressed forward, bringing the head of her cock against Luna's.
They came together.
The sensation was indescribable—her own orgasm mixing with the feeling of Luna's cock pulsing against hers, their cum mingling, hot and slick between them. Luna made a sound like a sigh and a moan combined, her whole body shuddering.
"That was lovely," Luna breathed, when they'd both stopped trembling.
"Yeah," Hermione agreed weakly. "It really was."
They lay there for a moment, tangled together, catching their breath—
"Hello? Is someone in there?"
Hermione's blood ran cold.