Nighttime had fallen on Canterlot. Apart from the local nightclub industries profiting from all the night owls, everything was quiet. However, in the barracks of the Royal Guard, one stallion was tossing and turning in his bed. Emerald struggled to sleep as his dreams were plagued by what had happened during the day.

Following Twilight's recent experiment, Emerald succumbed to more by the studious mare. According to Twilight, she justified that she needed several results to ensure the results of her study were accurate. And so, she would often suck him off when they finished whatever she had him doing as the mare had impressed him. He saw Twilight as this perfect little mare who was nothing but innocent. She was a studious mare who cared about getting high marks and impressing her mentor, yet after that initial taste of Emerald's cock, she was obsessed with it. With the number of books she referenced and checked out, there seemed to be a little pervert inside the once-innocent mare.

The latest of their little sessions resulted in Twilight trying their session outside the tower. According to her research, excitement, and adrenaline was good motivation for helping one's sexual life. The mare told him that during the excited stage, the body prepares for sexual activity by tensing muscles and increasing heart rate and blood pressure. So, to get the best possible excitement, the pair made their way to the library. And for the entire duration, Emerald was to sit at a table with Twilight under him. The guard was to remain silent and avoid making loud noises to avoid unwanted attention while Twilight sucked him off.

The stallion felt so uncomfortable as he feared for his life and job. His reputation as a guard if some local found out that he was having his dick sucked off in a public place and by the princess' pupil of all ponies served as a good excitement that within a few minutes, it became erect. Twilight smiled at herself as she began to get to work. The mare was sucking his tip and bobbing her head back and forth as she applied some techniques her books mentioned to help her achieve sexual stimulation. The mare had one of her hands go down into her shorts as she began to play with her clitoris.

While Twilight had the easier job, Emerald did his best to remain silent. They may have been in a part of the library that most didn't come to, but that didn't mean they were safe. All it would take is someone to pass by their section to see the guard acting uncomfortable to question things. The stallion was putting all his training to use not to make a sound, but given Twilight's ruthlessness in attacking his member, it proved to be quite a challenge. The mare started by sniffing Emerald's cock as she jotted the smell for her notes. Taking a deep breath, she dove her mouth onto his member. The guard felt the mare's tongue as she was sucking his member like a lollipop, and she continued to make her way to his balls. Her marehood seized upon itself, and her marish juices gushed from her cunt once more, the flavor assailing her taste buds and sending her reeling with bliss.

Emerald was being sent on a pleasure train the likes he had never experienced before. The guard placed a hand on the mare's head, avoiding her horn as he helped move her head up and down. Twilight upped the ante as she took one of the stallion's balls in her mouth; she nearly sent him over the edge from just the contact. The studious mare placed her hands on Emerald's knees to get a firm grip and allow only her head to move. From the moment she got her first taste of cum, specifically Emerald's cum, Twilight had become addicted to it. The taste and consistency were impossible to describe, but it felt so good. So good that she needed it. She wanted it. She lusted for it so much that she planned to make it a part of her diet by swallowing a load of the stallion at least once a day.

Emerald groaned at how skilled Twilight was at sucking him off; guess all the books she read did pay off. The studious mare then changed her technique as she removed her mouth from Emerald's member before attacking it from the side. That nearly sent Emerald overboard as Twilight's tongue coated his member with her saliva. The lavender mare moved her head from left to right while sucking the cock in front of her with her tongue; she then changed back to being in front of the member as she moved to the underside. Slattering it with saliva while bobbing her head back and forth. Twilight swirled her tongue around his shaft, adding another layer of pleasure as she gave it everything. She didn't gag. She didn't hesitate. Every fiber in her being dedicated herself to giving the best blowjob in Equestria.

"Twilight... T-Twilight..." said Emerald as he tried to get the mare's attention.

She was too focused on the task in her mouth that she didn't listen to Emerald's plea that he was about to burst. The guard couldn't suppress a moan as it escaped his lips from having the star pupil of the princess sucking him off. He soon reached his limit, letting loose and firing off his semen. His cock exploded in her mouth, filling it with hot, salty semen. She gagged as she shot up from her position, hitting her head on the table, but not before Emerald landed a shot of cum in her face by accident.

The thud was fairly hearable as Emerald immediately panicked. He looked to see if anybody was coming as footsteps were heard. A shadow approached their section as the old librarian appeared to peek into it. Emerald was now repositioned to have his back turned to the old mare as he turned to see her. She asked him if he was alright, to which he gave a thumbs up as her answer. The librarian seemed to buy it as she smiled and went. Once she was gone from sight, Emerald turned to look down as Twilight was still bent down and looking at his member. The mare was licking her fingers and lips of his warm semen, swallowing it like honey.

"Excellent work," said the mare.

"Just get out from there, quick!" said Emerald as they pushed their luck far enough that he backed up and allowed the princess' pupil to come out.

Twilight emerged from under the table as she saw the stallion turn away from her so that he could put his member back into his pants.

"I don't know why you are hiding it from me. I've already seen it," said Twilight with a smirk.

"It's a guy thing, okay. Don't ask me!" said Emerald as he turned to address the mare before adjusting himself and turning back around.

The mare quickly passed a hand over Emerald's crotch, causing it to swell up again.

"I wouldn't mind having some more later," answered the mare with a somewhat cheerful smile that messed with the guard's mind. She then began to leave, leaving Emerald to contemplate himself.

The guard awoke as he finished recalling his day and sat up in bed. The stallion touched his head as he tried to make sense of this situation with Twilight. To think it all stemmed from his being assigned to her as her bodyguard and them kissing in the library. He couldn't make heads or tails about whether it was a blessing or a curse. Seeing his member poke his sheets didn't help either, as he groaned and pulled back to reveal his little guy. Half mast as his dreams of recalling today's events affected it.

"I know, bud," said Emerald to his member as he groaned, almost like it was thinking the same thing.

---

Safe to say, Emerald didn't get much sleep after that. Morning came as he opened his eyes and had some bags under them. He groaned as he rolled to his side and pulled the pillow over his eyes to try to get some sleep. However, it seemed he couldn't even get that as a scroll magically appeared and flopped next to his head. He grabbed it from Twilight, the mare telling the stallion to come over right now as she wanted to go over some new lessons with her guinea pig. She also told him to bring an extra set of clothes per her order. Emerald groaned as he just sent the scroll away and turned, hoping that he could skip today's meeting.

Another scroll appeared as this one landed on Emerald's head as if Twilight had purposely teleported it to land on him. He opened it as another message from the princess' pupil, the studious unicorn reminding the royal guard of the contract he signed and the guidelines he had to follow less he wanted to risk being fired or worse. And given how he was messing around with the star pupil, he was digging his grave more every time they did. Twilight had him by his balls, literally.

"Why did I kiss her in the library?" asked the stallion as he groaned before getting ready.

The guard took a slight detour as he stopped by Pony Joe's doughnuts to pick up breakfast for him and Twilight. He often heard from the mare's mumblings when she was focused on her research about doughnuts from a place she visited often with her parents. The guard entered the establishment and tried one from the owner; the guard was amazed at how good it tasted that he had purchased a box full. He was heading to the mare's tower as he climbed the many stairs and soon arrived at the top. Immediately, he saw the mare by some desk as she was scribbling some stuff down onto some scrolls.

The stallion placed the doughnuts on the table in the middle of the room, knocking on it to make his presence known. Twilight snapped out of her focused trance as she saw Emerald standing there.

"You're late!" said the mare as she got up from her chair.

"Well, I got you some doughnuts," said the stallion.

"I don't care. I asked you to be here, precisely 13 minutes, 43 seconds, and.... wait... did you say you got doughnuts?" said Twilight as her nose picked up the scent.

Emerald opened the box as he revealed the sweet treats. Twilight had her mouth water at seeing the round objects as she only got that way with two other things. One of them was currently attached to Emerald and under some clothing.

"Alright. I'll excuse this tardiness. But just for this once." said the studious mare as she grabbed a doughnut and began to munch on it. The lavender unicorn relished tasting it as it had been so long since she last had one. Emerald smiled at seeing Twilight enjoy the doughnuts as he found it adorable in a dorky way. Adorakable? Yeah. That was the best word to describe Twilight.

The breakfast brought by Emerald put Twilight in a rather good mood. The mare had eaten way more than half of the box as the stallion was impressed by how she could eat so much and yet not have any effect on making her fat. It amazed the guard at how the studious unicorn managed to retain her figure, though with how much sweets she ate; he was sure they would go to the mare's hips or perhaps her ass. Either way, he wasn't complaining, as that was something he liked about Twilight's body. Her hips and ass, they were just how he liked it. Especially her ass. He would always go for the latter if anybody approached Emerald and asked him what he liked more between a mare's tits and her ass. The reason is that there was less to be disappointed about.

Putting that thought out of his dirty mind, Twilight wiped her mouth of crumbs as she addressed Emerald.

"Thank you for bringing breakfast. It's been so long since I last had a doughnut from Pony Joe's."

"My pleasure. I'll be honest. I didn't know the place existed until today. But I'll say this, they make some damn good doughnuts." Emerald took a bite of his, knowing it was full of carbs that he could easily burn off.

"Well, I appreciate you doing this."

"At least I'm not just serving my purpose as a fucktoy," stated Emerald as he finished his snack. "So... what do you have me doing today? Do I need to start dropping my shorts?" said the stallion as he began to go for his zipper.

"Actually, no. Well... at least, not yet," stated Twilight as Emerald stopped. "First thing, did you shower before you came here?"

"With how you demanded me to come over, I had to skip it. I applied some floral fragrance from my buddy."

"Okay. Well, that's not important. Because after what I have planned today, we both will need one. Anyways, I'm getting off track." said Twilight. "So... today's experiment is going to be different. So, you recall how I said you'll be rewarded if you continue to do what I say or ask?"

"Yeah," confirmed Emerald.

"Well, the past two weeks since we started these sessions, you've been doing the tasks I ask for. Even the other day, I asked us to perform an experiment in the Canterlot Library. I could tell you were slightly uncomfortable about it, but you still went through with it."

"Yeah, well... I guess you can chalk that up to my stupid send of duty and wanting to fulfill my honor as a guard. That you and have me by the balls, literally." responded Emerald.

"Yes, well, maybe one should have rethought their actions that moment in the library," said Twilight. "Regardless, we're here now, and what's done is done. Now, I believe I should reward you for a job well done for putting up with my methods and procedures."

"What's the reward?" asked Emerald, sighing.

Twilight didn't initially say as she removed her purple boots, leaving her in her socks. The guard was confused until he saw Twilight removing her belt and starting to lift her shirt.

"Woah, woah, woah. Hold on!" called out Emerald as he stood up with his hand out. Twilight looked at him as she had her arms crossed at the base of her shirt. "What are you doing?"

"I'm undressing. This is part of your reward and part of our next experiment," said Twilight as she went back and lifted her shirt to pull it over her head.

The mare folded her garment and sent it on the table as Emerald looked at Twilight, the unicorn wearing a darker purple bra. Twilight knew Emerald was watching her as that was what she was hoping; just from the sight of Twilight standing in a bra, Emerald's member started to feel something. While he may have favored a mare's ass more, Twilight's breast filled out her bra quite nicely. The mare, however, kept her shorts on as she looked at Emerald.

"Since I'm always pleasuring you, you'll be the one pleasuring me this time."

"Uh-huh. And... how exactly?" asked Emerald.

"For this experiment, you are allowed to touch me. However you may wish, there's one thing you can't do. You can't touch my shorts or my... pussy," stated Twilight, not fully ready to address her vagina by the term.

"Okay. And... what's the point of all this?" said the guard.

"The point is for you to make me feel good. You know... give me an orgasm, as it's referred to," said Twilight nervously.

"So... let me see if I got this right?" said Emerald as he clasped his fingers together, put them to his face, and sighed heavily. "You want me to touch you, but anywhere near your "oven" is off limits, and the whole purpose of this is so that I can make you cum?"

"Um, well, p-precisely," said Twilight, slightly embarrassed after hearing Emerald lay it out in laymen's terms.

"Why?" asked the guard, as he wasn't fully the purpose of this experiment.

"Because I read in a book that while touching one does give arouse. It's also based on mood. Basically, without me going into too much detail, the bottom line is it's not where one touches someone but how they do it." explained Twilight.

"How?" said Emerald as he was even more confused. "My brain is just.... oh, gees."

"Just... try it," said Twilight as she leaned against the side of the table with her arms behind her back with a slightly nervous look.

Emerald sighed as he stood up and approached the mare to stand before her. The guard looked at the mare; he could tell by her blushed face that she was still unsure about this idea, but he could also see she did want to go through with this. The stallion put a hand to his chin as he began to think about Twilight's little game; the guard was really thinking about how to make the mare orgasm if he wasn't allowed to touch her sensitive parts.

From Twilight's perspective, the mare examined the guard like he was trying to solve a complex math problem in school. In a way, it was cute to the studious unicorn to see the stallion before her, a member of the Royal Guard, having trouble with something simple. Most ponies would jump at the chance she gave Emerald and would have already done something, but Emerald hadn't, as he was still trying to think.

A good while passed as Emerald was still looking over Twilight and trying to devise his plan.

"Are you having troub..."

"Just give me a minute, will you!" Emerald told the unicorn. "This isn't the first time you've dropped a bombshell on me out of nowhere and expect me to come up with the right answer."

"S-Sorry," said Twilight for suddenly dropping this on the guard as she continued to lean against the table with her arms behind her while looking away.

Eventually, Emerald began to move as he approached the mare. Twilight was still looking to the side when the guard grabbed her chin with his right hand to make her look at him. He looked at the mare before leaning in and kissing her. It lasted for about seven seconds as he pulled back to look her in the eye; he dove back to capture her lips before removing and trailing along her chin and kissing her shoulder. The stallion's hands moved around Twilight to grab her hands as they were held to their side while Emerald kept kissing her left shoulder, sending shivers to the mare.

Twilight then wrapped her arms around Emerald's neck while he wrapped his arms around her waist. He pulled the mare in so her breasts pushed against his chest. The scent emitting off the mare soon invaded Emerald's nose as the pair removed their mouths from each other but kept their foreheads touching. They kept gazing into each other eyes as Twilight was already starting to feel something inside; Emerald's plan was already starting to work as it excited Twilight. The mare shifted herself to have Emerald's erection against her waist as if to taunt him into breaking the rule she had in place.

The stallion fought against it as he knew Twilight was doing it to add more pressure on him. He soon continued with his plan to make Twilight experience an orgasm as he dove back to capture her lips. He brought a hand up to cusp one of Twilight's breasts as the mare felt it, even through the fabric. She felt pleasure on two fronts; the obvious one was Emerald playing with her breast while the other came from his mouth and how he kissed her neck and collarbone.

From what Emerald could gather, it seemed that Twilight was enjoying what he was doing. The cues he got from the studious mare told him that he was working his way to making her have an orgasm as the sound of her breathing and heartbeat had gotten faster. He then executed the next part of his plan as he pulled down the right side of Twilight's bra to expose her breast. The cold air hit the mare, sending more shivers down her spine and reaching a new maximum when Emerald's mouth latched onto it. The soft flesh in his mouth and how he sucked on her nipple, Twilight leaned her head back for a bit as she relished this wonderful feeling. The mare soon looked at Emerald, working his magic as her hands on his shoulders tightened.

The guard removed himself from the breast and planted kisses down her body. He came to her stomach and noticed its smooth planes; he planted kisses along her cute belly button. It made Twilight squeak that she had to lean back and lay on the table. The lavender mare lifted her head to see Emerald still kissing her stomach and belly button as she felt her marehood getting wet. She then saw him go lower as he reached her waist. She was about to remind him of the rule but soon felt his hands behind her legs slowly going up as he felt them. Firm, supple thighs ran up into her shorts and away from his eyes and fingers. He massaged them as he examined the short.

"You said I couldn't touch your pussy, but you never said anything about your ass," whispered Emerald into Twilight's ear as his hand caressed her ass.

"You... you... clever," Twilight didn't finish commending Emerald for finding a loophole as he pressed his lips against her to silence her.

The stallion had his hands caressing her butt as he grabbed the straps of her panties and slowly pulled them down to expose her ass. Her underwear stopped under her marehood as Emerald's hands returned to fondle and rub her bubble butt. It took considerable willpower not to grab the edge of the short, pull it down, and devour what Twilight was hiding from him, but Emerald kept his composure and did not let his lust take over. Twilight moaned as she started to feel all of Emerald's effects as her marehood got wetter and wetter with each passing second.

Twilight's breathing became heavy and quick as her marehood was now drenched. All of what was happening to her body, Emerald kissing, sucking her right breath while he used his magic to massage and twirl her left breast while his hands just played with her ass; all three things working in sync, in rhythm as they affected the mare to where she couldn't hold it back in and let out loud moans. Soon she felt her limit reach as she got Emerald to look at her; the guard removed himself from sucking her breast as she grabbed the side of his face to pull him hard into a kiss as she came.

The mare moaned into his mouth as she finally achieved what she wanted. She just had an orgasm. After a few moments, they broke the kiss as they pressed their foreheads together, with Twilight panting for air. Her legs wobbled as they lost some strength from her ejaculating as her marehood juices dripped along her legs. Emerald looked at the mare he was holding up as he could tell from her face that he just made her experience big. Soon, he got her to look at him as they gazed into each other's eyes.

"Congratulations. You did it," said Twilight. "This experiment is a success."

Once she gained strength, Emerald removed his hands from Twilight and allowed her to take some steps forward. She grabbed her shirt to put it back over her and straightened out her shorts before heading to her desk.

"Evoking your partner's desire is more than just what you do to them; it is the fact that you do it. That kind of emotional connection can deeply intensify sex to a level that physical acts cannot achieve alone, " the studious mare wrote down her observation.

Emerald sat down in a chair and drank water to regain himself. He downed the whole thing in one trip as he awaited for Twilight to finish writing down what she wanted. The mare was focused on recording her observations from their experiment, as she wasn't paying attention to the guard trying to get her attention.

"Twilight? Twilight? Twilight!" said Emerald, trying to get the mare's focus as he sighed.

---

The guard attempted to ask the mare if he could use her bathroom to clean himself from all the sweat and musk he acquired during their heated session. However, she was distracted by her notes as he just helped himself use her bathroom. The stallion approached a door, opened it, and took in the mare's lavatory. Nothing fancy: white marble floor, walls, a small shower area with a sliding door, and a nearby sink. Emerald soon began to undress as he stepped into the shower area and turned the water on.

The stallion felt the water hit his fur as it gave him a sense of relief. He could wash away the musk and dirt on him as he felt reborn. The guard was so into the warmth of the water that drenched him that he was unaware of someone else entering the shower. Emerald scrubbed his neck as a pair of arms wrapped around him; the guard noticed the arms as he turned his head to see Twilight in the shower with him. He looked confused as the water wet the mare's mane, who seemed to smile at him.

"What are you doing?" asked the guard as the mare released her hold of the stallion, who turned around to face her.

"The next experiment. Showering together," said Twilight.

"Oh, come on!" shouted Emerald.

"Remember. Whatever I say," stated the mare.

The guard could only sigh before he gasped; Twilight had already made her move as she wrapped her hands around his member and began to stroke it. Within seconds, the cock Twilight was holding stiffen and became erect. Emerald couldn't hold back an audible moan at not only Twilight's handjob but the added effect of the water on his cock as it served as an amplifier for the mare's technique. The stallion bit his lip to avoid cumming too soon, but it was proving difficult, and Twilight knew that as a smirk appeared on her face. Most other ponies would kill to be in Emerald's situation of having a hot mare jerking them off in the shower as her smooth touch was indescribable.

Just then, Emerald grabbed one of Twilight's hips before moving down to her folds. The mare gasped at the stallion's sudden touch as she felt his fingers on her folds. By doing that, Twilight ceased her handjob and moaned, allowing Emerald to catch a break from her assault. She looked at Emerald with a look of pleasure and annoyance for what he did without her permission.

"Two can play at that game," said Emerald, trying to get back at the studious mare.

"Game on!" said Twilight, as she wouldn't lose this challenge.

She moved her hand from Emerald's cock to his balls as he gasped. The mare massaged his balls as Twilight smirked before losing it as Emerald stuck his fingers into her pussy; it was clear both didn't want to lose to the other. The pair then had their horns glow as their magic emitted; Twilight used her magic to stroke Emerald'c cock while rubbing his balls, and Emerald had his magic twisting Twilight's breasts while he fingered her cavern. It was an all-out war on who could submit to the other and make them cum first; neither side was willing to give an inch, but the intense pleasure each felt, they were slowly losing their hold.

The pair soon began to reach their limit as Emerald felt himself about to release. He removed one of his hands from Twilight's pussy to place it on her shoulder as he got the mare to look at him.

"Twilight... I'm... gonna..."

He didn't finish as Twilight cut him off by leaning forward to wrap her arms around his neck and pressing her lips against his. The mare deeply kissed the stallion as they closed their eyes; the warm embrace of the other's tongue sent the ponies into bliss as their bodies jolted. They just tuned out everything, including the sound of the water falling over them, as they focused on each other and their touch. The pair just let loose, and both reached their climax. Twilight had juices flowing from her pussy down her long legs while Emerald's cock was positioned upward, and it sprayed the mare's body, with some getting just under the mare's breast.

The two ponies relished in the warm feeling after ejaculation as it added another layer to the mood. The water was starting to wash Twilight's juices off her leg as she made an effort to dip some of her fingers into Emerald's semen that was on her body before it disappeared. The studious, kinky, perverted mare brought her fingers to her lips as she tasted the most delicious thing she was now addicted to.

"Mmm..." said Twilight as she sucked her fingers off seductively as the sight of it made Emerald's cock slowly start to reharden. Twilight noticed the guard's throbbing member as she looked at her guinea pig with a smirk. "You still got the energy to continue with the experiment?"

"I... think so," answered the stallion.

The water passing over Emerald's groin affected him; the intense throbbing at the base of his cock after such an intense orgasm already left him sore. The guard held his cock to position it to where the water didn't make him wince.

"Maybe we should wait until you're ready. Until then?" said Twilight, as she could tell that this new experience would require a bit more time, especially since they didn't have any elixirs nearby to recover Emerald's vitality like their past experiments. Plus, she, too, was a bit exhausted and wanted a moment to catch her breath. The mare noticed a bottle of body wash as she grabbed it and looked at the guard. "Mind helping me wash my body?"

Emerald nodded as he grabbed the bottle; he popped it over and poured the syrupy liquid into his hand as he rubbed them together. The stallion looked at the mare, who was slightly nervous about this part of the experimentation. He eventually landed his hands on her chest as he began to scrub it. Emerald began to scrub her breasts as he got a hold of them, which elicited a moan and gasp from Twilight; the soapy suds added a layer of stimulation that made Emerald's fondling even better.

All the sounds that Twilight was making helped Emerald's cock to recover as it began to get harder with each sound. The guard explored Twilight's chest and every aspect of her breasts, tracing his fingers around her nipples and squeezing them. The stallion even pushed a finger into her nipples. It really set off Twilight as when he pushed off with a pop, her breasts bonged, nearly causing the mare to lose her balance.

Emerald then grabbed some more body wash as he began to lather up Twilight's body. Her hips, her ass, her smooth legs, the guard was doing his duty of ensuring he washed the mare thoroughly and didn't leave a spot of her fur unclean. Each rub the guard did cause Twilight to let out a series of moans. As Emerald was washing her ass, he couldn't help himself as he squeezed it; Twilight moaned as Emerald then dove his other hand into her clit as he washed that area of her. It caused the studious mare to push her body against her bodyguard as her breasts pressed against his strong chest while she also felt his dick against her stomach. The close contact from the studious unicorn made Emerald's cock throb as the mare pulled the stallion in for a deep kiss.

The pair soon broke their kiss as Emerald raised his hands to cusp her cheeks. He leaned in for another quick kiss before attacking her neck with kisses as Twilight closed her eyes and placed a hand on Emerald's head to encourage him. The stallion pulled back as he touched her shoulders and turned the mare around. He put his arms around her as he cleaned and touched her breasts from behind as she threw her head back. Twilight backed into the guard's chest as he cleaned her body.

"My turn..." spoke Twilight as she managed to get that out between her panting.

Emerald was confused until Twilight touched his shoulders to turn the guard around. She then had him sit down as she was on her knees and pressed her breasts against his back. The feeling of having Twilight's breasts going up and down against his back made his cock eject some precum; Twilight was also having her hands explore Emerald's body just as he did to hers. She left a bubbly trail as she felt every inch of the guard's body; most importantly, his abs and muscles felt strong as diamonds but soft enough to fall asleep in them. The studious mare found her target as she moved down Emerald's thighs before grabbing the rock-hard shaft and gently caressing his balls.

"Are you ready?" asked Twilight as she could tell both regained their strength to continue their experiment.

"Yeah," said Emerald.

Twilight loosened her grip and pulled Emerald around to face her. The mare then began to lower herself as she sat in Emerald's lap, the guard placing his hands on her hips to hold her as her pussy was rubbing against his cock. Just the mere touch of them making contact, Emerald could feel how hot and wet Twilight's clit was. The mare felt how hard the guard's member was as she could only imagine how it would feel inside her. It was tempting, and both knew it. Before either could let their bodies take control, Twilight began to bounce up and down as she rubbed her clit against the shaft. The shape and texture were something new to Twilight as despite knowing how it felt with her mouth and hands on multiple times; she got a new perspective on it using her cavern.

The two were riding a new wave of emotion as the water gently splashed over them. Emerald took charge as he pulled Twilight in closer, connecting their lips. The pair were on a new level of sexual nirvana as the water flowed down their backs; Emerald moved his hands down to Twilight's butt as he began to massage the two luscious cheeks.

"Mmm... yes!" moaned Twilight through her mouth as she opened her eyes to look directly into Emerald's.

The two had traces of red on their face as they just got lost in each other's eyes. The friction between the two felt so good; electricity flowed through their bodies as jolts of excitement, and adrenaline, fueled their emotions and mental state. The mare fell into a state of lust as the only way to satisfy it was relief; with a few more strokes, the pair got their relief. After a couple more thrusts, Emerald and Twilight reached their peak. The stallion's member couldn't hold back, and the pleasure got too much to handle, and he fired off steams of his seed; Twilight also let loose as she orgasmed her most today. Bits of Emerald's cums stuck to Twilight's body as she could feel how hot and sticky it was. Their juices mixed due to their parts touching as Twilight extended a hand down to wipe some on her finger; the mare brought it to her mouth, and the new taste was even better.

The mare just kept sitting in Emerald's lap as he held her firmly. Nothing but silence remained as the only sound was the water dropping down on them. Small bits of fog had started to form, only added to the steaminess between the two ponies. The guard raised a hand from Twilight's hips to caress her cheek as Twilight's magic turned the knob and shut off the water. Another moment of silence followed that as the mare kept her eyes on the guard; her mane was all wet, as was Emerald's, though it wasn't as bad as hers due to his short mane.

"I think we should get out," said Twilight to the guard.

The mare planted one last gentle kiss on Emerald's lips before slowly getting out of his grip. The stallion stood up as he witnessed the mare's backside to him as she wrapped a towel around her body; the towel allowed the guard to see all of Twilight's curves, and he couldn't help but think that it made her more beautiful. Twilight gave one last look over Emerald as she tightened her towel; a look of concern came across her face as she exited the bathroom. Emerald heaved a sigh, part of him wondering what this independent study would bring and whether he was living up to Twilight's expectations as her subject.

Next Chapter: Chapter 5: Nirvana Estimated time remaining: 1 Hour, 39 Minutes