The Twilight Experiment

Twilight stretched her arms, deciding to get up and shut the curtains so that the sun doesn't continue to blind her. Her double awoke as well, moving her arms back. "I thought you had school?" she mumbled out as she stretched.

The girl closed the curtains, blocking the sun's light from entering the window. "Spring Break." she yawned to her Equestrian counterpart, "We have a whole week off."

Princess Twilight sat up, "Oh. Is your family home?"

"Only Spike is. I just have to feed him." the girl answered, putting on her glasses, which she grabbed from the dresser placed next to her bed. She blinked a couple times before looking down, seeing the dog still asleep. Twilight saw his ear twitch and an eye open, "Spike?" she called out.

"Yeah? I'm awake, Twi." Spike yawned.

Twilight smiled, "You want something to eat?"

"Heck yeah! Man, I wish I had hands... And were taller sometimes so I could get the food." Spike admitted.

The girl petted the dog and he smiled, "I know. But do you mind if you stay downstairs for a bit today after I get your treats? The two of us wish to conduct a few... tests and I don't think you want to be involved with them."

"Got it, Twi. You two ever need the company, I'll be up in a jiffy!" Spike saluted a a paw on his forehead.

Giggling, the girl led the dog downstairs to give him a few treats, "I know. That's why you're the best dog."

Princess Twilight heard the door creak open, seeing her doppelganger step back inside. Twilight slowly closed it behind her and she said, "Okay... Now it's just us. Alone. Are you sure you want to do this?" she asked again.

"I'm sure. For a while, I thought about this too." admitted the princess. "Would this fall under incest or masturbation? It's an odd enigma that's got many people confused."

Twilight sat back down her bed, "I'm not sure. Perhaps there's a term out there to describe our situation?" she suggested. "But we spent all night planning this. I just want to make sure you're in this, I don't want you to think you have to do this." she added, seeing her double nod. "So... How should we begin?"

Princess Twilight sighed, "Well, we decided to test the waters by kissing again."

"O-Okay..." gulped Twilight.

Deciding now was the the time to begin, the doppelgangers leaned forward. It felt as though a spark was ignited in their chests and butterflies were in their stomach. The Twilights held each other close, enjoying the taste of one another. The counterparts held each other like that for a few minutes, sitting still. But then, they separated, giving each other a half-lidded stare.

"Wow..." gasped Princess Twilight.

"Y-Yeah..." agreed Twilight, "D-Do you want t-to be m-more intimate?"

Nodding, the princess wrapped her double close and kissed her again. This time, the Equestrian felt something push on her lips and she nesrly gasped before closing her eyes. She complied and opened her mouth, allowing her doppelganger's tongue to enter her mouth. The girl proved to be dominating in their little dance and the princess tilted her head, moving deeper into the kiss, pushing her wet muscle into her human counterpart's mouth.

As much as she hated to admit it at first, those strange intimate nights in her head with Midnight proved to help Twilight in making this little pet project a success. But she remembered that for now, they were only on the testng stage: testing the waters in a way to see if there truly is a spark between them that could reach a deeper level.

Princess Twilight slowly raised a hand, and rubbed her counterpart's arm, stroking downward on it before wrapping her fingers around her hand. The soft touch of the former alicorn made Twilight moan in her doppelganger's mouth. Their tongues continue to swirl in each other's mouth before finally parting. Their tongues were hanging out of their mouths and a very thin trail of saliva could be seen hanging from them, showing their connection.

The two Twilights gave each other a wide eyed stared, surprised by how much they enjoyed that. Their faces were as red as an apple and they felt warm. They noticed they were holding hands at this point, but they chose not to part. "U-Uh..." stammered Twilight, the girl's mouth hanging open.

"W-Was it too much?" Princess Twilight asked.

Twilight shook her head, "N-No, that's not it. I liked it... Really. I'm j-just surprised by how much I did." she explained, tightening her fingers more around her doppelganger's own.

Sighing, the Equestrian spoke, "I-I'm sorry, I've never r-really been this intimate with anypony on my world. S-So all of this, it's all new to me."

"Me too." Twilight said back, not counter her recent encounters with Midnight.

Princess Twilight uncurled her fingers from Twilight's hands and held her cheek, "D-Do you want to move on now?"

"Y-Yes, please." stammered the girl.

Instead of reaching for her doppelganger's lips, Twilight lowered herself to her jaw. "T-Twilight..." quietly squealed the princess, her counterpart's hot breath and caressing lips on her chin threatened to melt her into jelly at how sensual the feeling was for her. She shut her eyes in pleasure, enjoying the feeling. Hearing that made Twilight continue and peck her cheek, reaching down for the Equestrian's collarbone.

"O-Oh..." moaned the former pony, with Twilight's mouth on her neck, moving her lips up and down, a quiet smack heard a few seconds apart. She raised her head and saw Princess Twilight's pleased smile, her mouth hanging open and drooling in sensual pleasure from what just happened.

Out of nowhere, Princess Twilight groped her double and pushed her down on the bed, shoving her mouth onto Twiight's own. She laid atop the girl as she repeated what she did, slowly moving her lips across the human's jawline. The princess's hands were stretched out and holding her doppelganger's own. Twilight let out a yelp upon Princess Twilight reaching her head down to her neck, her tongue slowly moving upon it.

"D-Don't stop, T-Twilight..." Twilight whispered, the princess pecking her neck again before reaching for her counterpart's lips again, moving in for a deep kiss.

Princess Twilight whispered back, "I don't want to..." she leaned on the girl's chest, "Do you want to move on to the next part?"

"Yes..." Twilight agreed, leaning upwards to kiss the Equestrian one more time. She couldn't believe how good that felt, neither could the princess. Yes, they kissed before, but not quite like this. They continued for another moment before letting passion consume their every movement.

And now, Twilight found herself in a predicament. One that she was hoping wouldn't end anytime soon.

She was straddling herself.

Sitting on top of her and holding her was Princess Twilight, who gazed down at the girl with a surprisingly lustful stare. Her tongue was hanging from her mouth and she distanced her head away from her doppelganger's face, awaiting her response.

"S-So..." the princess gasped.

Twilight repeated, "S-So...?"

Princess Twilight cleared her throat, "D-Do you want to move on to the next stage? To b-be more physical?"

The girl slowly nodded, "Yes... B-But it'll require us to... Undress ourselves." she quietly gulped, grasping the Equestrian's hands as she spoke.

The Equestrian princess nodded, understanding the situation. She raised her arms, removing her shirt and tossed it on the floor on the side of the bed, just next to the nightstand. The human Twilight mirrored her actions and threw hers on top of the former alicorn's. She then removed her glasses, folding the hinges and placing the spectacles on the nightstand next to the alarm clock. Finally, she reached a hand to the scrunchie in her hair, removing it, allowing her hair to flow freely from its bun.

For the Equestrian Twilight, it was like looking straight at a mirror. But she didn't mind that. Here she was, holding her beautiful doppelganger underneath her, exposed in a way that only the two of them can comprehend. Silence was passed among the two, their faces warming up at seeing one another like this.

Twilight slowly reached a hand up to the princess' cheek, "Shall we... continue?" she asked curiously, unsure of how to move on at the moment, breaking the silence at last.

Princess Twilight cleared her throat, "Y-Yes..." she whispered.

Lowering her head, Princess Twilight continued the experiment, pressing her lips back to her doppelganger's. Aa they kissed, the two Twilights caressed one another, moving their fingers up and down each other's bodies, their hands seemingly moving of their accord and their actions not thought of.

Twilight stroked her right hand upward, seemingly touching something round and rather plump. Opening an eye, she realized she was rubbing the princess' breast. "Mmph." she heard the former pony moan in her mouth, liking the feeling. Deciding to get more physical in this experiment, the girl decided to rub the side before reaching for the bra string, unstrapping it at last. They separated, allowing Princess Twilight to do the same to her.

"Are you o-okay with this?" Twilight asked her double.

Princess Twilight nodded, "Yes... I think so. Wow, um... I guess we're becoming more physical then..."

Being the first to take action, Twilight held the Equestrian's breasts and began to rub them, Princess Twilight gasping out in pleasure at the touch of her counterpart. The former alicorn then brought up her own palm and kneaded the girl's own breast, sending tingles down Twilight's spine. The princess leaned forward and stuck her tongue out, kneading her doppelganger's nipple, her wet appendage doing wonders for the girl's adrenaline.

The touch of her Equestrian double's tongue on her areola forced the human to mumble incoherent words, babbling nonsense as Princess Twilight continued to tease her nipple, her other hand rubbing her other breast. Once again, she was at a loss of words over what was happening.

Princess Twilight moved her head back, a soft pop sound heard as she gazed in the eye of her double. Twilight had some drool running down her face, wishing the feeling of the princess on her breast never leaving. "K-Keep g-going..." she pleaded in a hushed tone, her mind scrambling over the foreign feeling, "P-Please..."

In a haze, Twilight pecked Princess Twilight's mouth again, moving in for a deep kiss. It was short, exciting, but they parted almost instantly, the girl choosing to move her lips down to the Equestrian's chin, her lips caressing her jawline. Princess Twilight closed her eyes and allowed her counterpart to continue, her mouth hung open and a whisper of babbles escaping her own mouth.

Moving downward, Twilight had planted her lips on nearly every inch of the Equestrian's neck, sticking her tongue out occassionally for the fun of it. She finally reached Princess Twilight's breast and began to do what her counterpart did. Her tongue circled around the former pony's areola, and she was surprised by how good it felt, "T-Twilight... W-What are y-you.. Y-Yes..." she wondered, babbling over the surprisingly strange moment of passion.

But alas, Twilight leaned back slightly, ending the moment. The two sat up, giving each other a lustful stare, the two of them nearly about to become a puddle of goo over their intimacy, that is, if their minds hadn't already gushed down. The only thing that was shared among the two was silence and a very loving embrace. While they hugged, the two Twilights reached down for their pajama pants and seeked to remove them. They felt something wet in their panties, no doubt from the moments of excitement that just passed.

Their chests heaved, quiet panting heard from the two of them. "D-Do you want to do this...?" Twilight asked her counterpart.

Princess Twilight, "T-Twilight... I've never been more sure."

Princess Twilight pushed her doppelganger down again, holding her wrists before gently wrapping her fingers around her palms. Twilight loved being straddled by her doppelganger now, she couldn't deny that. Not when she not only realized how bizarre the idea was, but how beautiful she looked.

While her mind ran with this, she didn't realize their panties had been removed. In a rush, she rolled Princess Twilight around on the bed and was now lying atop of her. She pecked the Equestrian's lips as she raised a hand, ticking the princess's chest, moving downward until she reached her desired spot. Something pulsing and yet in between the former pony's legs.

Twilight moved her fingers in Princess Twilight's loins, the princess having no idea of what her doppelganger was up to, but a second later her mind gushed, "Sweet Celestia..." she gasped under her breath. The girl would be lying if she said she was experienced in this sort of physical activity, the only source of moments like this before today were her dreams with Midnight, which gave her a vague idea of what to do.

While Twilight moved her fingers in the Equestrian's nether lips, the princess kissed her in a haze. Her lust and adrenaline consuming her for the moment. Princess Twilight's tongue invaded her double's mouth, loving every moment of what was happening. Twilight's fingers felt wetter with each second, no doubt pleasuring the former pony. The princess gently kneaded the girl's breasts with her fingers, exciting the girl even more than ever.

Princess Twilight never wanted her counterpart to stop. The feeling was too good, her fingers still gently massaging her vulva. She was nearly about to cum, another moan threatening to escape her lips. At last, Twilight felt something dripping onto her hands and stopped at once, the juices staining the covers of her bed. She'd clean it up later. But for now, Princess Twilight paused their kiss, panting. Twilight took the moment to slowly and seductively lick her fingers, giving her doppelganger a fun wink.

Satisfied, Twilight made out with the princess one more time, sharing the juices she just tasted, opening her mouth and dancing with her tongue. A smack was heard as they parted, their chests heaving up and down, clearly not used to this kind of interaction. The former alicorn was the first to speak, "Woah..."

"Y-Yeah..." the girl agreed. "D-Do you want to h-have a turn?" she offered.

Princess Twilight pursed her lips and wrapped her arms around her double, lying on her hip as was Twilight. "Actually... I was hoping to move on to something else now. Then." she gave a lidded, lustful stare, "Once we begin that, then I'll have my turn."

Twilight knew she was talking about the second part of the experiment. It was going to be weird at first, but despite her oncoming transformation, she was going to have more than her curiosity satisfied.

Now they had to clean up and get to the portal.