Marik was moaning. With Melanies voice. Whoever would have watched would have thought it was Melanie however, Mariks stepsister, laying on the couch in the alchemist laboratory and pleasuring herself. In fact it really only was a thin layer of Melanie, worn by her brother, unable to move or act on her own behalf at this moment. Yet she felt all he did to her, and himself through her. She felt his throbbing member press against the inside of her belly, and eventually unload his seed somewhere among her insides. She could only wait for her brother to finish this game and get out of her.

But Marik wasn't even near done. The spell had turned Melanie into nothing but her own skin. Hollow, yet sensitive. And also very stretchy, as Marik had found out when he had slipped in through between her thighs. Now he was opening the same hole with his hands, moaning with joy as he felt her pleasure as her skin stretched. Finally he reached inside and grabbed his own fox cock, dragged it outside, until his genitals where protruding out of Melanies vagina.  Her skin squeezing his sack tightly, making him hard just once again.  His erect member now making her look like a hermaphrodite.

Meanwhile Marik had found out that Melanie was well aware of what he was doing. The eventual twitch of her skin, a slight tugging here and there that told him she was still trying to get back in control. He went up and showed himself off in front of the mirror, gently brushing over her tits, then down between her legs, grabbing his own genitals and jerking of. Searching a hint of her reaction in the mirror reflection he saw.

Later, after doing a couple of more experiments with his borrowed female skin, he suddenly felt very tired, and eventually laid down on the couch, not bothering to slip out of her, or revoking the spell.

She felt his breath go deeper and slower, felt him relax inside her, and eventually his control over her slipped. It was hard to move any of her limbs, with him filling her insides. But at least he didn't resist it anymore.  Melanie gulped, suddenly very aware of Mariks tongue inside her own, Mariks eyes behind hers. Slowly she moved her arms downwards with Mariks arms inside them, behind her back, carefully trying not to wake him up.

Marik stirred. The sensation on his rectum making him move uncontrollably in his sleep, dragging Melanies arm back upwards and grabbing his, or rather her breast, while moaning slightly in his sleep.

Melanie was determined. It had become a game, a challenge, as always. And she wanted to win. Finally she inserted her hands into her ass, carefully stretched her own skin and separating it from Mariks, his finger still within hers, occasionally twitching or flexing. But then she had it, both hands inserted, pulling herself apart further and further, trying to pull her skin over Mariks hips. As it finally snug over, her ass almost felt inside out.  But Mariks sack and penis were still stuck through her sex hole, limp now, but still tricky to pull herself over as the sensations nearly drove her insane.

Over time she got more control over her movements, Marik either unaware or uncaring in his sleep. She managed to pull her legs up closer, and then pushed his ass right out of her rectum hole. Her back end overstretched beyond measure, but now she could reach through and try separating her leg skin from Mariks.  It felt almost a bit like undressing stockings, except she was the stocking, and the legs inside them weren't hers.

Even while it didn't really hurt she was really concerned about ripping herself, as she finally pulled Mariks legs out of herself by the ankle, twisting their conjoined body to a weird angle. But everything went fine, until she finally was kneeling on her own, freed, hollow legs, while Mariks lower body, legs and hips, up to his belly were stuck out of her ass. As she tried to push up, loosening Mariks upper body, it became clear that Marik had been aware all the time, He was now actively pulling backwards, assisting Melanie by grabbing her face around the cheeks and pulling it forward, until she felt him slide out of her head. His tongue sliding out of hers with a slippery sensation, his jaws dislodging from inside hers.

Finally, able to breath on her own again, Melanie let out a relieved gasp.  Inhaling deeply, while Marik was pulling her hands of his like one would undo a glove. She flexed her fingers, free again, ready to assist Marik, and soon he pulled his upper body and head out of her, her ass finally relaxing.

Almost though. For his hand was still stuck inside of her.

"That was great, wasn't it?"

"Well", Mel answered, glad to have her voice back to herself.  "Definitely an experience, though you could have let me free earlier.

"I am not done yet." Marik responded, pulling Mel's hollow body backwards, grabbing her sex from inside, his fingers sticking out through her vagina.  Melanie gasped, shuddering. "Gah. What ... What are you planning?"

"First this..." Melanie felt herself pushed upon Mariks ready, pulsing member, Now stuck in through her natural hole. "And now I'll repay your shrink spell favor from last time".

What? No. You wouldn't..." 'Dare', was what she wanted to say, but the tingling sensation running through her skin interrupted her. It came with the shrinking spell she had once used on her Brother. The world around her grew bigger, Mariks Hands mercifully went out of her, but not so his penis. Instead her it grew bigger and bigger, until her hip was spread unnaturally wide once more. She felt his rippled cock inside, growing, squeezing against her chest skin, pressing against her shoulders from inside. Pushing further. Melanie made a gagging sound, as her neck was stretched wide, and the pulsing tip of Mariks cock was pushing into her head, filling it out. His cock pas now as big as she was.  Or rather she had shrunk to its size. Filling her out completely, only her legs and arms dangling, able to move. With her hands she reached for the only thing reachable, her breasts, while her legs clenched against Mariks balls, squeezing them.

As Melanies skin attached closely to his, he again felt every sensation as if it was his own. Except that now those sensations were on his throbbing cock.  Melanie felt it pulsing throughout her, making her entire body twitch with each of Mariks heartbeats. And then he gently started stroking her.

Melanie moaned, as far as she could, and then a first drop of Mariks pre-cum was squeezed out of her mouth. It felt salty, but exciting. And he didn't stop, until she almost lost conscience from his forceful rubbing between his palms, his claws scratching her skin.

Marik felt the texture of Melanies fur against his fingers, and the exciting sensation of brushed fur on the skin of his cock, jerking, jerking, until he finally lost himself. A load of white juices spurted from Melanies mouth unto the floor.

Melanie coughed and gagged a bit, but there wasn't much she could do unless Marik would go limp again. Finally she felt the pressure ease, giving her a bit more room to move, though even limp Marik still filled her up nicely.

"You know what?" He said, smirking. "I think, it would be fun to try out the reverse spell for that hollowing out, with me inside you, I wonder what would happen."

"You wouldn't dare? We don't know what would happen!" Melanie said, although she could imagine "We don't even know if that could be reversed."

"Hehe, don't worry, sis. I double checked that. I am using a safeguard, it will be reversable, but I wanna know what happens."

Melanie protested, but she wasn't able to do anything. Soon later Marik had reached for a red spell crystal he squeezed on her belly. "See? With that I can restore you just as you are now. Now lets activate it."

"Noo do'..." she couldn't speak further. An intense heat from inside made her stop, her mouth filling up with pulsing flesh somehow, her senses overwhelmed.

When she came to herself her body felt weird. She felt Mariks heartbeat inside her soft interior, pulsing, her skin limp against her body. It didn't feel like she had any bones left inside her, or fur on her outside. There was no need to breath, everything was nice and soft and warm though. As she opened her eyes she saw she still had arms, however reddish colored and furless naked skin, like worms.

A glance into the mirror in front of her confirmed to her what she had assumed. She was basically Mariks cock now. No fur, no real features in her face except her eyes, her muzzle replaces by the familiar tip opening of Mariks cock. She couldn't breath or speak, as she now lacked lungs or a throat, Only her arms moved and as she touched her 'face' with them they sent a shivering sensation throughout her and further deep into Marik. Who's body responded with a powerful throbbing, sending pulses of energy into her, making her throb and grow. She felt getting stronger and bigger, and the urge to touch herself, rub herself to more pleasure.

Marik gasped and moaned as his throbbing cock touched itself and jerked slightly. "Oh sis, this feels great. Yeah!"

Mariks blood rushed through the veins in her head loudly. Powerful thrusts that made her jerk and berk and Zerk, rhythmically, a first drop of precum, slimy between her lips. Fantasies of pushing herself between the legs of a female, into the sweet, warm and moist slit drove her wild, feeling the need to get herself thrust into something. Her arms reached forward to embrace Mariks hand, thankful that he read her need, thrusting herself into it as he rubbed his cock sister gently. Throbbing in ecstasy the drum of Mariks heartbeat drove her wild, until he finally moaned out loud, clenching his hips, pushing her straight and upright, and the pressure inside her drove a load of white sweet liquid through her, out of her mouth, and she felt so powerful she thought she could cover the whole world with it.

Marik arched, and the white drops of his cum covered the mirror on the other wall, holding his cock sister tightly, then shuddered.

Melanie was overcome with a comfortable warmness, as the pressure suddenly released, being replaced by a sweet calmness that was so comforting. A few last drops of cum where oozing out of her and she gently squeezed them out of her mouth, tasting their salty sweetness. shuddering with Marik, feeling herself go limp and soft again. It felt like she just had experienced the greatest thing in the world, bathing in the afterglow, embracing Marik's sheet that covered her like a warm blanket as she was sucked back into his hips.

She felt happy and content for now, and, still the sweetness of his cum on her lips, fell asleep with him.

As she awoke, she remembered all that like a dream. But it soon became very real as she felt her own soft sleekness against Mariks sheath, felt him move and walk. Then light came in as he pushed her out of his sheet with two fingers, her body dangling limply. "Morning sis, did you sleep well?" he greeted her. She couldn't answer, but she recognized the bathroom. And she felt a pressure somewhere inside Marik that was unsettling her. "Eew. No. I don't want that, turn me back" She thought, gesticulating with her wormy arms.  As Marik approached the toilet, her body gained enough firmness to at least hold herself straight. But only because Marik was getting ready.  "Here it comes. Lets see if you can aim that, try not to spill anything." And the pressure behind her unleashed, sending a flow of disgusting bitter liquid through her, filling her up and then spilling out of her mouth. She felt herself as just a pipe tunneling a stream flowing out of Marik and out into the world. It hit the back of the toilet, splattering drops all around.  "Watch it, you need to aim down!" Marik said, but kept it coming.  "You bastard, I'm gonna make you pay later" Melanie though, jerking, trying to clench or hold herself closed with her little arms. But it was no use. And after sending a few lashes of pee in all directions in her futile attempts to hold in Mariks load, she gave in and and bent down, watching the yellow liquid flow into the bowl neatly. Eventually Marik emptied and it ebbed down, went into a trickle, then a few drops. Melanie felt them in her, tried to squeeze them out. Then Marik took her little body between two fingers and shook her violently, making the last drop exit from her lips.

"Hehe, sorry couldn't resist doing that sis. Now lets see how we can bring you back to normal, shall we? And then I'm all yours." Melanie dangled openly between Mariks legs as he walked into the laboratory to get the spell equipment. But she already had a plan what to do to him. He would certainly enjoy it.

At first.

And then she would.

Oh yes, sweet revenge...