Twilight's Science Class

Luna waited patiently off to the side, her sister preserved for later, proper preservation into a science attraction next to her. Twilight had moved the table to the side as well, setting up a large, collapsible pool. She started slowly, carefully, filling it with liquid. She wore gloves over her front hooves, and had on a gas mask.

Luna watched with curiosity, Twilight erecting a bubble around the pool. Luna wasn't sure what it was for, she could see and hear her work quite well still. Soon it was full almost to the very top, and Twilight teleported in what looked like a small crane and harness-Luna assumed it was most likely for her. It was too big for a normal pony and only just too small for Celestia. Twilight fussed with it, unbuckling the straps. She pushed the crane over to Luna, aided by wheels on the base.

"Alright, Princess Luna, this is your experiment-I'm not only going to take notes, but pictures of the various stages you'll go through. This is acid of my own make-it'll eat through hair, flesh, and muscle, but leave your bones clean and polished for display." Twilight explained, as Luna walked into the harness, helping Twilight buckle her in with her magic.

The harness supported her chest with holes for her fore limbs, a buckle under each wing keeping them spread out as it hurt to fold them in, and another support with leg holes around her nethers. Her head was unrestrained, as were her legs. Twilight had the crane lift her up, and her legs dangled under her freely. It was an odd feeling, being moved over to the pool in the air while not flying.

Luna soon realised what the bubble was for-the smell of the acid was strong, and made her cough and her eyes water. Twilight enchanted a camera to float and take pictures randomly and when she instructed it as well. It snapped a shot of her from below, showing she wasn't yet in the acid and what she looked like before.

Twilight sat down, her magicock still stiff between her legs, one hoof rubbing it while the other tapped commands onto the crane's input. With a slight lurch, Luna began to descend-slowly. Very slowly. This was going to be painful, she mused, but then again...if it helped both their little ponies understand more of their own and an alicorns anatomy, helping the next generation, then it would be worth it. Hopefully.

Her hooves, unshod for the first time in so long, just barely dipping in the acid. She jolted, yanking them up again-she hadn't expected that to hurt so much, not until it hit above the hooves at least. Twilight watched her with great interest, and Luna let out a long, calming breath, gently extending her hooves until they hit the surface, and it became much harder to hold on to her decorum.

It burned and hissed on her, stripping the outer layer of her hoof off, leaving just the hoof and bone. It worked fast, no wonder Twilight wanted her to be lowered in slowly. Luna struggled despite herself, splashing the acid about, getting flecks on her coat and face, burning holes in herself.

Twilight watched carefully, noting it all down, including when Luna began to neigh in distress. As she was lowered further, she splashed more fiercely until her legs went limp, now too damaged to move more than a tiny sway. As flesh and muscle was burnt away, her bones were cleaned and fell to the bottom of the tank with soft tinkling noises.

Her eyes burnt from the fumes, her vision burring as they were damaged by it. Her wings ruffled, but she didn't dare try to flap them-she'd be coated in agony, although she considered it as the tiny flecks from earlier ate hungrily into her flesh, expanding to be as wide as a bit and twice as deep. Her blood seeped out of the wounds, diluting the acid, slowing the eating and dragging out her demise further.

Soon Luna was held at a depth that would have had her hooves on the bottom if she still had them, only her neck and head above the acid. The camera took snapshots all the while, a panting Twilight with her mask still on moving to stand on top of the crane's command. Luna was confused until she saw Twilight furiously jacking off to all of this.

Luna looked away, gore and blood surrounding her as she was held up and floated partially. Twilight moaned and her money shot hit Luna right in the face. Luna shook her face in surprise, as Twilight grinned and used her hind leg to flip down the crane's lever, and Luna was dunked in the acid. She screamed, doing nothing but swallowing acid and gore.

The lever was cranked up and she was brought up just enough to break the surface with her head. Her eyes were melting down her face out of her skull, her tongue in ragged slices and falling out of her maw, each tooth coming loose and slowly plopping into the acid. Like her bones, they hit the bottom with a rattle.

She thrashed, the thin skin on her belly finally rupturing, spilling her guts out into the acid, some of them already spotted with holes from her swallowing the acid. Her intestines slopped out first, dragging her stomach with it. She gasped with agony as she felt the acid burn at her heart, an impossible agony. She let out a final, terrified, pained whimper, and her head sunk beneath the acid.

Twilight went over her notes as she waited for Luna to dissolve. It had gone well, the camera had taken pictures as needed and told, and she couldn't wait to publish her findings! Of course, there was a final adult alicorn to experiment on first... Summoning a scroll, she wrote a letter, and sent it to the Crystal Empire. It was time for a visit to her favorite sister-in-law.