The Possibilities of Potions

She slid off of the bed, finding her hooves unsteadily. Pressing her front right hoof between her still-shaking legs to keep from dripping onto Twilight’s floor, she wobbled on three legs across the room to the box of potions.

Twilight, lying in a cloud of bliss, rolled her head over to look at Rainbow. “Switching again? All right...” She blew a sweaty strand of her mane out of her eyes. “Could you bring me the mare potion? I don’t even know if I can stand right now.”

“Gimme a second.” Rainbow downed the potion, smacking her lips.

“Huh?” Twilight blinked.

Rainbow felt the transformation beginning. She gritted her teeth as the stretching came upon her again. Her body blocked out, and the hoof pressed to her nethers was suddenly shoved forward, and given a coating of leftover fluids that splattered around it onto the floor. Whoops. Forgot about that.

“I’ll get that later,” she muttered sheepishly, turning back to Twilight and grinning.

Twilight smirked. “There’s a bottle of ‘Varnish Vanish’ in one of the boxes. ‘For the really tough stains,’ Zecora said.” She tilted her head against the sheets. “So are you bringing me that mare potion or not?”

“Nope.” Rainbow’s grin widened.

Twilight frowned in confusion, before a glimmer of understanding lit in her eyes. She raised herself off the bed, sitting up on her haunches. “You sure about this?”

“Oh, come on, Twilight! When are we going to get another chance like this?” Rainbow raised an eyebrow in what she hoped was a seductive look. They might acquire more potion, of course, but she was unsure that they would ever both be willing to go this far again once their heads had cleared.

“I...” Twilight laughed, and shook her head, still processing the idea. “You’ve got a point, I suppose. And hey, we should test this potion thoroughly.” Her eyes narrowed, and her smile sharpened. “But this time, I want to be on top.”

Rainbow swallowed. It had been a long time since she’d tried this sort of thing, but like she’d said, when was an opportunity like this going to come along again? “Deal.”

Twilight scooted back on the bed to make room, but Rainbow turned back to scan the list of potions. Clearing her throat, Twilight asked, “Something wrong?”

“While you’re already pretty, ah, slippery,” said Rainbow, giving a little aha as she found something promising, “I’ll feel better if you have some assistance.”

Rummaging in the box, she withdrew another bottle, this one unopened. “Here we go. Number seventy-two, ‘Sugar Glider Glide.’ This ought to do the trick.”

Twilight gave an un-stallionlike giggle. “Zecora told me she uses that to lube her door hinges.”

Rainbow grabbed the bottle in her mouth and grinned as she carried it over to the bed. She set it down on the damp sheets. “You believe her?”

“Not anymore.” Twilight’s horn glowed, and the bottle floated over to her. Rainbow slid onto the bed, as Twilight popped the cork and started rubbing the bottle’s contents on her rising stallionhood. “Mmm, smells like vanilla.”

Rainbow slid across the sheets, feeling her leg touch a sticky patch. She stuck her tongue out. “I am going to need a long bath after this.” She gave Twilight a skeptical look. “You still got another one in you?”

“Oh, yes,” murmured Twilight. Her dick was now shining with a coat of neatly applied lubricant. She recorked the bottle, and set it on her nightstand. “Now, if you don’t mind,” her eyes glinted, “let me see those pert little cheeks of yours.”

Swallowing her doubts, Rainbow twisted over on the sheets and bent down. She raised her rear, and felt a slight air current tease the rigid cock hanging between her legs. Flicking her tail aside, she spread her legs slightly to allow better access. Rainbow took a deep breath, and blew it out slowly.

Twilight’s weight shifted behind her on the bed. Purple hooves touched the sheets to either side of her, and she felt a warm body press against hers. Unexpectedly, the first contact wasn’t on her hindquarters. She felt Twilight’s shaft sliding along underneath her own, slipping smoothly past her balls and rubbing the length of her dick. She gave a short, surprised grunt.

Twilight began slowly grinding under her. Rainbow closed her eyes and tried not to pant. She felt painfully hard again, but totally conflicted between the desire to plunge into something or have herself filled.

Twilight withdrew from beneath her, and then Rainbow felt a hard rod sliding between her buttcheeks like they were sandwich buns. Twilight rocked back and forth, sawing her cock on Rainbow’s backside.

Rainbow was panting hard, now. “I’m ready, Twi.”

“Okay,” said Twilight, giving her flank a comforting rub. Rainbow felt something warm spill over her backside, and guessed that Twilight was pouring more ‘Sugar Glider’ over her. She wiggled her backside in anticipation.

Finally, she felt the head of Twilight’s cock at her rear entrance. It entered her slowly, unstoppably, and she felt a low purr in her throat as it pushed inside. Her own dick jerked up with tension, but she held herself still as Twilight went further.

“This is... a lot tighter,” grunted Twilight, her hooves firmly planted on Rainbow’s cheeks.

“Tell me about it,” said Rainbow, her lips dry. “Keep going.” She stared down at the rumpled sheets and her own twitching cock as Twilight pressed deeper, inch by inch.

Rainbow felt an unmistakable soft feeling, as Twilight’s balls squished up against the region between her butt and her own sack. Her cock was aching for release, now, and she flipped her tail up over her back. “Come on, Twilight.” She looked over her shoulder and panted, too desperate with desire to even smile. “Rut me.”

Twilight began to move, and the real delight began. The unicorn slid in and out of her butt, making Rainbow groan with every filling thrust. Her cock slapped up against her belly as her hips rocked, sending little bolts of pleasure up her spine. A trickle of lubricant slid down her leg.

Shoving all the way forward, Twilight leaned down over Rainbow’s back, and whispered in her ear, “I have to say, Rainbow, I love this. Being this deep inside you, it’s...” she grunted, and thrust again, “it’s just...” She shook her head, and gave up trying to find the word.

She placed her hooves on Rainbow’s back, and pushed her down to lie flat on the bed. Rainbow’s cock was pressed between her belly and the sheets, still throbbing. Not leaving her, Twilight continued to pound away, getting faster and harder with every stroke.

Rainbow felt herself drooling as each slam in her butt pushed her cock over the sheets, rubbing it against her belly. Her legs felt boneless as she let Twilight ram her again and again. “S-s-so f-full...”

Suddenly, as Twilight shoved inside her, she felt a shattering blast of incredible pleasure. She choked with surprise, her eyes crossing. Twilight paused. “You okay?”

“Y-yeah.” Her chest heaved. “Wow. That was as good as having my clit tweaked. D-do... hit that spot again.”

“I can try.” Twilight pulled nearly all the way out, leaving a mere half-inch inside, before slamming her entire length home.

Rainbow squealed as another wave shook her, and her balls squashed against the bed. “Ohhh, Twilight, I don’t think I can take another one of those.”

“Let’s test that, hm?” Twilight squeezed Rainbow’s flanks together and buried herself inside. Her cock hit that glorious region again, and Rainbow lost all semblance of control.

Her cock erupted beneath her, smearing jets of cum into the sheets and her sweaty fur. She gave one long, continuous moan as she came, shuddering as she pumped out her load.

Twilight slowed her thrusts, and slowly slid out of her. She gave a little huff. “Aw, done already?”

Rainbow rolled out of the huge wet spot she’d created, not that the rest of the bed was in much better shape. “Sorry, Twi,” she said weakly. “That was just too much for me. Too good, too fast.”

“Hmm.” Twilight eyed her cum-soaked fur with a mischeivous gleam in her eye. She smiled. “I’ve got a hypothesis I’d like to test.”

“Oh?” Rainbow blinked, still recovering from her powerful climax.

“I’m wondering if drinking the stallion potion again has, er, ‘reset’ you, so to speak.” Twilight poked Rainbow’s limp cock.

“Think I have more in me?” Rainbow laid her head back on one of the pillows, the sole completely dry spots left. “Feel free to try, but I don’t think you’re gonna have any luck.”

“We’ll see.” Twilight placed a hoof on Rainbow’s dick and began slowly massaging it.

Rainbow smiled. “It feels nice, but not hard nice.”

Twilight merely leaned her head down and stuck out her tongue. Rainbow raised an eyebrow. Surely she’s not thinking of—

Rainbow’s breath caught in her throat as Twilight touched her balls with the tip of her tongue. Twilight ran up along the length of Rainbow’s shaft, but she didn’t stop at the tip. She kept on going, her tongue pushing through the cum-soaked fur on her belly. Finally lifting off, Twilight swallowed, and licked her lips.

“D-dang, Twi...” Rainbow took a shaky breath as Twilight began giving her entire belly a tongue bath. She let her head fall back into the pillow and let go, enjoying the sensation of Twilight’s tongue lapping against her soft, tender skin.

For at least a minute and a half, Twilight continued her work, cleaning Rainbow’s lower half from the top down. Soon, Rainbow felt a now-familiar feeling as her loins reported in for duty. “Ah, Twilight... about that reset thing. I think you were right.”

Twilight smiled. “I often am.” She continued licking, finally reaching Rainbow’s cock. She rolled her tongue around it, taking dollops of the sticky semen like she was eating ice cream. With agonizing slowness, she cleaned the last of it, sucking on Rainbow’s tip and drawing a groan.

She sat back, clearly satisfied with her work. “Ready to keep going?”

“Ye-yeah.” Rainbow propped herself up.

“Excellent.” Twilight sighed, smiling ruefully. “All right, I had my turn.” She levitated the bottle of lube over again, and unstopped it. She poured the liquid over Rainbow’s stiff erection like syrup on a pancake. It was warm and runny, dripping over Rainbow’s entire crotch and soaking down into the sheets.

Rainbow shifted her balance, spreading her legs to give her cock a clear path up. Twilight rose above her on all fours, and slowly lowered her butt down onto Rainbow’s waiting dick.

As Rainbow felt herself entering, Twilight’s eyes widened. “Wow,” she muttered, “That’s... different.”

She let herself slide down slowly, but slipped and suddenly rammed down on Rainbow’s cock. Both of them gasped with surprise. Twilight winced. “Ow.”

“You okay?”

“I think so. Just give me a minute to get used to this.”

Rainbow smiled amiably, and looked down at the long, purple cock now lying on her chest. She stretched her right wing around and began gently massaging it. Twilight hummed in enjoyment.

Twilight’s dick lifted as she pushed herself up. Slowly but surely, she began riding Rainbow, gliding up and down on the pegasus’s lubed-up shaft. Her face was glowing with suffused heat and pleasure, pushing herself toward one more orgasm.

It wouldn’t be long. Both of them had already had a crazy number of climaxes today; Rainbow knew Twilight had to be burning fumes. The unicorn’s mouth made a little o as she rose and fell, her cock slapping against Rainbow’s chest with every descent.

Twilight gasped again, now moving as hard and fast as a jackhammer. The next time she came down, Rainbow grabbed her flanks and squeezed like Twilight had done earlier, jamming herself as deep in Twilight’s butt as she could go. Twilight’s eyes shot wide open, and her mouth hung loose. “Oh-”

Her cock blew like a volcano, hosing Rainbow in the face. Thankfully, the blast missed her eyes, leaving a thick, sticky line across her mane, nose, and mouth. The second and third shots fell short, landing on her chest. Twilight kept going, her eyes rolling up into her head.

Rainbow ran her tongue around her lips, licking up the strands that lay across them. The tangy taste was enough to finish her off, and she closed her eyes as she felt the rush begin again. Her hips bucked up as she burst inside Twilight, filling the unicorn with a boiling splash.

Twilight didn’t wait to pull off. Rainbow’s cock flopped to her chest, completely spent. With cum oozing from her butt, Twilight slowly ground her softening dick against Rainbow’s. Their cocks both moved limply, still dribbling. Their cum pooled together on Rainbow’s chest.

“I see... what you meant...” panted Twilight, “about that spot.” She blew out a breath.

Rainbow touched her chest and lifted a sticky hoof. “It’s kind of a shame. You worked so hard cleaning me...”

Twilight grinned, and her horn glowed. All of the cum matting Rainbow’s fur suddenly slid off of her, into the demolished bedspread. Rainbow’s mouth worked wordlessly for a moment. “You mean you could have done that in the first place?”

“Sure,” said Twilight, laying down beside her. Twilight ran a hoof softly in circles over Rainbow’s chest. “But I think the first way was more fun.”

Rainbow gave an exhausted laugh. “I never knew about this side of you, Twi.”

“You know me pretty well now. Inside and out.” Twilight kissed her neck.

“Yeah.” Rainbow twisted to cuddle, feeling her still-softening dick brush against Twilight’s. She purred in satisfaction.

“Mmm,” mumbled Twilight. “I suppose we should change back. I’ve got to get these sheets cleaned before they’re permanently ruined.”

Rainbow snorted. “You might just want to burn them.” She nuzzled Twilight’s neck. “Besides, we’ve got one thing to do first.”

“Hmm?”

“There’s still a matchup we haven’t tried.”

Twilight gave a throaty murmur. “Well, we don’t want our experiment to be incomplete, do we?”

Rainbow kissed her on the cheek. “Definitely not.”