Misuki and Aisu were over at Chocolate's place for the weekend and one evening, they were a little bored. Chocolate had some important work to tend to, so he decided to give his guests something fun to do.

"I heard you're quite fond of cockvore, huh Misuki?" Chocolate asked bluntly. Misuki, caught off guard, broke into a slight blush. She hesitated a little at the strange question, Aisu perking his ears curiously to listen.
"Y-yeah, I guess. Why do you ask?"
"I have something you might enjoy. Come with me," He said as he got out of his chair, and led the pair to his potion workshop. "Now where did I put those..." Chocolate mumbled to himself as he looked around in the numerous cupboards and shelves displaying hundreds and hundreds of different coloured flasks and vials.

"Ah! Here they are," he said triumphantly, returning with two flasks with pink and blue fluid in either one - the pink was labelled 'CV-', the other 'CV+'. "When drunk, these potions will allow one of you to vore the other without harm, and after a few hours they will be let out again in one piece. What do you think? I have a bunch of important things I need to deal with this afternoon, and I wouldn't want to leave you two alone with nothing to do. Are you up for it?" He asked with a smile, holding the flasks in either paw.

"I think I'd love that," Misuki said, nodding eagerly with cheeks still flushed. Aisu seemed restless.
"Great. Now before you go, you really need to make sure that the male subject - that would obviously be Aisu - drinks the pink potion labelled 'CV-', while the female takes the blue one, 'CV+'. If you mix them up their effects will not only be reversed, but strengthened. You'll end up stuck inside Aisu until you turned into-" he stopped himself before saying too much. "Anyway, it's not something you'd want to happen" Misuki nodded understandingly, but before they could leave Aisu spoke up.
"Um..." Aisu opened his mouth to continue, but hesitated.
"What is it Aisu? You want to look around a bit huh?" Chocolate asked, to which Aisu nodded. Chocolate put down the flasks someplace safe and gave them a tour of the huge laboratory where he concocts all his potent potions for fun or otherwise.

Until they heard a loud thump and a surprised cry coming from the other side of the room - It was Ruffy, who was staying over for the weekend as well. Unfortunately he had been forced back into wearing diapers after an incident involving another potion he drank unknowingly, and as he still hadn't gotten used to walking around in them he lost his balance a little, bumping into the desk holding the two flasks and toppling them over into his lap. As they rushed over to help him, Ruffy looked down to find the flasks' labels had come off. To avoid getting into trouble he quickly stuck them back on and handed them to Chocolate, brushing himself off embarrassedly as his diaper crinkled softly.

"What's wrong Ruffy?" Chocolate asked, "Are you ok?"
"Yes, I'm fine. I'm still not used to these things. Anyway, you have a phonecall - it sounded urgent." Ruffy replied, catching his breath.
"Oh, ok. I'll be right there Ruffy," Chocolate turned and handed the flasks to Misuki "You can go to your rooms and nobody will disturb you until you are ready. Remember what I said - minus for Aisu, plus is for you. Got that, Misuki?" She nodded as Chocolate rushed off. "Enjoy yourselves!"

Misuki smiled to Aisu and they both went to their room, Misuki locking the door behind herself and looking at the vials as she undressed, along with Aisu. "Ok, so... Chocolate said plus is for me... Makes sense really, that's the pink potion. This one's yours, Aisu," She said, handing him the blue flask, "Drink up and change to your feral form real quick... It'll be more fun that way," Misuki said, already getting excited. They gulped down their potions and set aside the flasks, waiting a little nervously.

Something stirred inside Aisu. "I- I feel funny, Misuki."
"I think that's normal, Ai- ahh..." Misuki said, gasping softly as a shiver flowed through her. "Quick, change now, Aisu!" and Aisu obeyed, changing and falling on all fours. But when he recovered from the change, he looked up to find Misuki was at eye level with him, and still shrinking. She squealed in surprise. "Oh! It-it works fast!" panting slightly in excitement as she fell back onto her rear, the change in height disorienting her badly. She tries to catch her breath when a thought rushes through her head.

"Wait, I- Didn't Chocolate say that my potion was," she paused for a moment, recalling her instructions all of a sudden, "Blue! Oh no! No!" But she was too late. Aisu was towering over her already, and he quickly stood above her body, his cock drooling precum all over her and wetting her legs and groin with the sticky liquid. She felt helpless. She couldn't move because of the potions effects, even when she knew her impending fate.

"Aisu! Stop, please stop!" But he couldn't listen - the potion was controlling him and before long, he pushed his cocktip up against her feet, the small opening instantly slurping them up and pulling her in deep. "Aisu, Stop!" She begged again and again, desperate to get away as she clung to the floor for dear life. Soon she was engulfed by darkness, and she slid down Aisu's cock into his soft balls which swelled up to accomodate the visitor. She felt herself grow weak, and her thoughts slowly faded as she changed - her muffled cries for help persisting until the potion's work was completed.

Several hours later, Chocolate decided to check up on his guests and see if everything was alright. He knocked several times to no answer, and growing worried, he pulled out a spare key, unlocked the door and made his way inside. Aisu was on the floor, tired and spent, all while huge amounts of cum lay splattered all over the floor next to him. His cock was still squirting seed in a seemingly endless orgasm. "Oh no." He bit his lip and quickly gathered some of the fox's semen - which was once Misuki - into a vial, sighing deeply.

He'd already had one incident with these potions - why did he have to go and cause a second one in the same weekend? Now he'd have to spend the rest of the week to find a suitable female to inseminate in order to bring Misuki back. Certainly a chore he could do without.