The feast was still going on in the Great Hall, but Hermione and Luna weren't interested. For the first time in weeks, Hermione was horny - and she was horny! Her and Luna's encounter on the train had re-awoken her sexual appetite, and she had spent all of the main course glancing at Luna and blushing, amusing and arousing all three girls. Ginny had decided to stay at the feast, hoping to find somewhere quiet with Harry later, but Hermione and Luna rushed down their food and almost ran out.

Clambering into the common room, and chasing up the stairs to the girls' dorm, the two girls immediately locked in a long, forceful kiss. Breaking for air, they stripped themselves down to just panties, and got into one of the single beds. Again they kissed, Luna atop Hermione, she took Hermione's arms and pressed them down above her head, giving her spare hand free access to the brunette's body. Pressing their tits together, she reached slowly down...

"'mione! You're so ready to go! Do you like being pinned down?"

"Mmhmm... I want you to touch me..."

"Gladly!" Stroking back and forth over her panties, Luna felt Hermione press against her hand, desperate to be touched. Luna took her wand and used it to remove her partner's last garment without letting her go. Squealing quietly as her underwear were ribbed unceremoniously off, Hermione encouraged Luna to find her clit - and she started grinding against her hand. Getting wet herself, Luna wondered how she could pleasure both of them. Thinking back to the book, she remembered the binding spell, and stopped touching Hermione for a moment - much to her complaint.

"If you like being pinned down, I think this spell would help..." and she leant back, kneeling upright, and cast the binding charm, tying Hermione's arms to the headboard, and fastening her legs wide apart. "Now we can both feel the pleasure!" And she restarted her circular grinding motions on Hermione, and reached down her own undies, watching a squirming, moaning young girl. Hermione was the first to climax, grunting and moaning she bucked her hips, trying to both escape and eek out as much pleasure as she could. Luna kept rubbing them both, delighting in seeing Hermione mewl and wriggle against her bonds, unable to do anything to stop the intensity from below. Eventually, Luna took pity on her and stopped touching them both. She removed her hand from her underwear and made Hermione lick them clean, lapping up Hermione's juices herself.

"How good at licking girls are you, 'mione?"

"I made Ginny cum, and I loved it!"

"Good girl." She removed her pants and positioned herself atop Hermione's face, "now, I'd like to cum!" Hermione instantly obliged, starting by running her tongue along Luna's lips, spreading her apart and tasting her. She found Luna's clit, and gently rotated on it, exhaling deeply as she did so. Shivers ran up Luna's back, causing her whole body to shake. She held on to the headboard for support. Hermione began sucking, puckering her lips around the clit, flicking her tongue across the tip as she did so. Already close, Luna moaned an approval, encouraging Hermione to go faster. And faster she went, causing continued spasms in Luna's thighs until mere moments later she came uncontrollably, screaming into the wall and thrusting up and down on Hermione's thrashing tongue, struggling against her constraints to reach Luna's throbbing, dripping pussy. Slowly calming down, Luna laid down against Hermione, kissing her and fiddling with her clit, trying to tease her.

"People will be back from the feast soon." Breathed Hermione.

"I know. But I'm not done."

"Me neither."

"We should go sit in the common room."

"One more?"

"Oh, you'll orgasm. There's another spell I want to try, and I think it'll work well with a game..."

*** The Gryffindor Common Room, half an hour later ***

Ginny stumbled into the busy common room, with a satisfied smile on her face. First years buzzed around excitedly, the more mature students sitting on sofas, still catching up from the summer. Towards the middle of the room, she spotted Hermione and Luna at a dining table playing a card game, so she wandered over.

"Hey..."

"Hey, Ginny!"

"Hi, Ginny! You're looking... happy!" All three of them smirked; they were all looking... happy!

"I recognise that look in you, 'mione, you look like you're still going!"

"Well... I..."

"Haha, oh my god you two! In the common room? That's kinda hot... Anyway, I need to unpack. Enjoy whatever game you're playing!" Wandering up to the dorm, Ginny felt herself getting wet again. She didn't think it was possible to still be aroused after being fucked so mercilessly by Harry's magically enlarged cock, both of them spunking so hard she thought she might burst. Upon reaching her bed, she opened her suitcase, to find a note had been left on the top of her underwear - in particular a special set of red lingerie she was saving for Harry. It read:

"We're having a lot of fun downstairs! We're using the Phantom Phallus charm to penetrate each other with an invisible cock. Every time we lose a hand in the card game, we make it more intense for the other person. First person to cum loses the game. If you're still capable of squirting after your night with Harry, we'd love to see it! Either way, put this on - for later xx"

Immediately intrigued, Ginny undressed, got into the lingerie, redressed and headed back downstairs - unpacking could definitely wait! Sitting down with her two friends, she pulled her top down slightly to discreetly show off her bright red bra. They decided to start the game again, so that each person was responsible for pleasuring one other person. It was an incredibly weird feeling that Ginny had never experienced before: a completely invisible, undetectable cock. And yet she felt it fill her up, moving slowly in and out, curving up and pressuring her g-spot just right. Orgasm or not, she was definitely going to squirt! The game began, each girl slowly adjusting to the snake in their jeans, trying to maintain a poker face in the bustling common room. Hand after hand they played, getting redder and redder in the face, all of them creaming in their underwear. Eventually, Ginny said:

"I don't think I can make it..."

"Sure you can!" Replied Luna, who saw this as an opportunity to make it a little harder for her, increasing the rhythm of her mystical penetration.

"Luna that's unfair!" Interjected Hermione, seeing Ginny respond to Luna's cheating. "That's not in the rules!"

"It's okay... I can manage... oh, wait... oh no!" Turning bright red and clamping her eyes shut, Ginny sat stock still for a moment before reopening her eyes. "Luna... please stop..."

"Did you...?"

"No, I haven't lost. But I need to... um... clean up."

"Is it... visible?"

Ginny looked down, and surreptitiously felt herself and the chair. "No."

"Well then we continue!" So they did, but it was only a couple more hands before it was Luna turning red and complaining. "Hermione! That's so over the top! I only lost one hand!"

"Yeah... but if we're playing strictly by the rules, I get to increase as much as I like, right?" She winked at Ginny, who took this to mean she should punish Hermione more. Several hands later, each girl now playing basically randomly as their magic cocks took over their brains, they were all flustered and on the edge of climax. Ginny lost a hand, resulting in Luna pushing the spell practically as far as she could, and she and Hermione watched as Ginny clamped her legs shut, scrunched up her eyes and shook as she silently lost the game.

"I... really think we should call that time out!" Gasped Ginny, and they all agreed. Barely able to stand, Ginny got up and packed away the deck of cards. "I need to... tidy up."

"I'm sure we could help?" Smirked Hermione.

"I'd love to!" Agreed Luna.

"Let's go then!" They bade goodnight to some familiar faces, and hurried up the stairs. Hermione and Luna stripped all the way, insisting that Ginny remained in her gorgeous lace underwear. Hermione again laid down on the bed, Luna sat atop her face, and Ginny took up position between her legs. They began suckling on each other's clits, lapping up over an hour's worth of girl-cum, magically massaged out of their g-spots. When they heard the bathroom door close.

"Oh my god!" Shouted Cho.