Luna Rides.

Luna slid closer, her own breasts still glowing from the potion's effect. She placed a gentle kiss on Harry's cheek. "Thank you for this, Harry. It's been... enlightening."

"You're very welcome, but it's your turn to see how well you can make those huge tits move."

Luna's grin grew wider, and she eagerly straddled Harry, her new, massive breasts bobbing as she positioned herself over his cock. Harry's eyes were glued to her chest as she sank down onto him, her plump tits enveloping him completely. The sight was more than he could handle, and he moaned deeply as he felt himself buried in her tight, wet warmth.

Hermione watched with fascination as Luna began to ride Harry, her breasts jiggling and bouncing in a way that seemed to defy gravity. She couldn't believe the turn of events, but she was too aroused to be shocked. Instead, she felt a strange sense of excitement building inside her, a desire to be a part of this intimate moment between her two friends.

Reaching out, she placed her hand on one of Luna's bouncing tits, feeling the softness of the flesh and the hardness of her nipple. Luna gasped and leaned into her touch, her movements becoming more erratic as she neared her climax. Harry's hands gripped Luna's hips, guiding her up and down, his own eyes never leaving the mesmerizing sight of her tits.

The air was thick with the scent of arousal, and the sounds of skin slapping against skin filled the room. Hermione couldn't resist the urge to lean in and kiss Luna, their tongues tangling as they moved together. Luna's moans grew louder, her body tensing with every stroke of Harry's cock.

"Oh, Merlin, that feels amazing," she gasped, her eyes locked on Hermione's. Harry watched, his own passion reaching a fever pitch. He had never seen his friends like this, so open and willing to explore their desires together.

Hermione's hand slid from Luna's breast to her own, her fingers playing with the plug that filled her ass. The sensation was strange and exhilarating, adding another layer to the pleasure coursing through her body. She watched as Luna's eyes rolled back in ecstasy, her pink, swollen pussy taking Harry's cock in deep, slow strokes.

"You're so beautiful, Luna," Hermione murmured, her voice thick with desire.

"Thank you," Luna breathed, her cheeks flushing at the compliment.

The room was a symphony of passion, with their moans and the rustling of the bed sheets providing the soundtrack. Harry's eyes darted between Luna's bouncing tits and Hermione's intense gaze, feeling his own climax approaching. He could feel Luna tightening around him, her movements becoming more erratic as she chased her release.

"I'm so close," Luna panted, her eyes squeezed shut in concentration. Hermione took this as her cue, her hand sliding down to Harry's cock, her fingertips teasing Luna's clit as she rode him. The extra stimulation was just what Luna needed, and with a scream, she came hard, her pussy clamping down on Harry's shaft, her juices flowing freely.

The sight of Luna's intense orgasm pushed Harry over the edge, and with a roar, he erupted inside her, filling her up with his seed. The two of them collapsed onto the bed, their bodies trembling with the aftershocks of pleasure. Hermione couldn't help but feel a twinge of envy as she watched the intimate connection between Harry and Luna, but she knew she had her own chance to experience this newfound freedom.

"No regrets on the permanent tits?" Harry smirked at Luna.

"Not a single one." She grinned back, her chest heaving from the exertion. "What about you Hermione? You going to keep yours or let them go back to normal?"

Hermione looked down at her swollen breasts, the potion's effects still lingering. "Maybe I'll keep them," she said, a mischievous glint in her eye. "I like the way they make me feel."

The three of them lay there for a moment, their bodies slick with sweat and their hearts racing from the intense encounter. Harry couldn't help but feel a sense of pride in his ownership of the castle, knowing that every inch of it was dedicated to pleasure and freedom.

Harry summoned a maid. "Hermione here needs the permanent breast enlargement potion."

The maid nodded, her eyes lingering on Harry's still-hard cock before disappearing with a pop.

"So, you're going to keep them?" Harry asked, his hand idly playing with Hermione's soft, pillowy breast.

"Yes," Hermione murmured, a sly smile playing on her lips. "They make me feel powerful, sexy... and a bit rebellious."

The maid returned with the potion, her eyes wide at the sight of the trio, still breathless from their escapade. She handed the vial to Hermione with a knowing look and a slight bow before retreating. Hermione studied the potion for a moment, her heart racing with excitement. She had always been the cautious one, but something about the castle, the potions, and the freedom of being naked and uninhibited had brought out a side of her she never knew existed.

With a deep breath, she downed the potion, feeling the warmth spread through her body. The potion tingled in her chest, and she watched as her breasts grew before her eyes, reaching a size that matched Luna's. She let out a squeal of excitement, cupping her new, larger breasts, feeling the weight and fullness of them in her palms. Harry's eyes lit up with approval, and Luna grinned widely, clapping her hands together.

"Look at us," Luna said, admiring their matching chests. "The unstoppable duo with the biggest tits in the castle."

Hermione giggled, feeling the potion's magic settle in. "We're like a pair of walking, talking sex toys."

"And I'm the lucky one who gets to play with you both," Harry said, his eyes roving over their bodies with a mix of pride and hunger.

"Yeah." Hermione smirked. "Now you got two gorgeous naked girls with huge tits addicted to your cock. What are you going to do about it?"

"I'm going to make sure you two are never unsatisfied." Harry chuckled, his hand still playing with Hermione's new, larger breasts.

Luna sat up, her eyes sparkling with excitement. "Oh, I can't wait to see what other adventures we'll have here."

Hermione nodded, her new, permanent tits feeling surprisingly natural and incredibly arousing. She leaned into Harry, her breasts pressing against his chest. "What do you say we go explore?"