"YES! Stuff my arsehole!"
Luna's pale eyes rolled back into her head. Hermione had reached around to stretch Luna's tiny arsehole open, allowing Ginny to collect her own shit off the ground and pack it into the waiting hole. "Fill my dirty hole with shit. Oh goodness it feels good, Ginny." Luna was close to frenzy, and although her arsehole had never been stretched so much before, she was in absolute heaven having someone elses shit pushed up into her rectum. "I'm so full..." she started to breathe heavy, shaking slightly as Hermione was licking the pale girls flat stomach. Ginny was now smothering her shit all over Lunas leaking anus and her arse cheeks. She spanked the girl a few times, and Hermione released her grip so that Luna's arsehole sealed it's self shut, trapping Ginny's shit inside.
Luna let out a low groan and fell to her knees, still facing Hermione. "My little arsehole is all full up." she giggled, and treated Hermione to a few gentle kisses. "Hold it in." Hermione ordered as she moved around to join Ginny, Luna's stinking yet perfect arse facing both of them, the shit covered anus twitching in delight. The girls moved their faces in close, retching at the foul smell. "Now Luna! Fart it out!" Ginny's voice was full of excitement, and after a few grunts from Luna, the blonde girl let out a gigantic fart, spraying Ginny and Hermiones face with faeces. The girls jumped at the impact, then groaned in delight as their faces were now covered. Luna continued to fart, sometimes the shit would fall out, sometimes it'd implode and splash the girls, and constantly her opening and closing arsehole was leaking.
Ginny raised herself suddenly, and squatted slightly, aiming her shaved pussy at Luna's messy arsehole. With a sigh she began to piss directly onto it. "Ohhh yes, clean my nasty shit hole with your piss." Luna sunk her head to the ground and began to hum with pleasure. Hermione moved her head so it was resting on one of Luna's arsecheeks, allowing Ginny's piss to splash off the arsehole across her shit covered face. Ginny had a strong flow of golden piss that just didn't seem to end, much to the delight of Luna and Hermione. Hermione began to gargle the piss then let it lazily fall out of her mouth, running down across the shit and onto the floor, her hand now firmly wedged into her panties toying with her swollen clit. The Room of Requirement absolutely stank of Ginny Weasley's shit and piss.
Ginnys flow of piss finally came to end as Hermione swallowed the last mouthful with a satisfied sigh. Luna, now resting on the floor still with her shitty arse in the air continued to let little farts slip out, each followed by a satisfied groan. Hermione inhaled each fart as it left the dirty hole, tapping frantically at her clit. It was amazing in how just a few weeks sex with Luna had corrupted her. She would have puked at the thought of having another girl fart in her face, but now she loved it. "Oh, I'm close to cumming..." Hermione spoke softly, inhaling another fart. "Those stinky farts making you cum, Granger?" Ginny asked with a wicked grin, inflicting a blush on Hermiones face. Ginny wiped a layer of piss off her pussy then licked her hand like a cat licking it's paw, her face still smeared with her own shit.
Luna was panting and dribbling, her body melting with pleasure. Ginny got back onto her knees facing Hermione, who started licking her face all over, tasting Ginny's shit off her freckled face. Luna's farts continued on, Ginny would lap at the filthy arsehole each time it opened up for a fart as she fingered herself. "Urgh, I'm gonna squirt already!" Ginnys voice sounded forced, and just as she quickly moved her robes out the way, her pussy exploded with cum, spraying onto Hermiones panties. Hermione began to squirm. Luna, half out of consciousness from arousal, let her knees seperate even further apart, forcing her arsehole open just enough to let more of Ginny's shit slip out directly into Hermiones open mouth. The shit made contact with her taste buds, and that set her off. With a squeal, Hermione shuddered hard, swallowed the shit then fell backwards moaning.
In the doorway of the Room of Requirement, Neville Longbottom stood, trembling and stunned. He had seen everything.