“Alright then...notebook, check.” Twilight thought out loud as she levitated a small notebook, sliding a quill through the binding wire at the top of it. “And....oh, that's the only thing I need.” she giggled lightly to herself as she glanced at the checklist, comprised of only one item.

Having already done some research on sexual habits of non-married ponies, tonight the lavender unicorn was preparing to take some notes on sexual habits of married ponies, more specially, Cup Cake and Carrot Cake. Of course, she had to do so in secrecy though, so just like when she had gotten worked up over her future, she dressed in a skin-tight latex suit, as to avoid being seen while making her observations.

After checking to make sure Spike was asleep, she silently left the library, sneakily making her way over towards Sugarcube Corner, making sure to avoid lights and open spaces in the process, despite the fact that barely anypony was outside at this hour. Arriving at the familiar bakery, she walked around to the back, arriving at the window she was looking for, knowing that it was the one to the master bedroom.

Being somewhat chilly that night, the window was closed; Twilight smiling and sighing in relief that she wouldn't have to be silent while observing. “Whew...this will be easier than the last one.” she thought with a soft giggle. Approaching the window slowly, she kept low and brought her head up to the windowsill, glancing into the bedroom to see the two married ponies already on the bed, cuddling together, already engaged in some affectionate nuzzling.

“Hm, so...nuzzling...” Twilight scribbled onto her notebook, keeping her eyes on the pair of ponies inside while the quill danced across the paper from her magic. “A few affectionate kisses, mostly cheek and lower neck...” she continued, watching as Carrot Cake slowly moved lower down his wife's body with his kissing and soft licks, until he reached the two plump udders between her legs.

“Ooh, wow...she's awfully big.” The unicorn thought with a light blush, watching as the orange stallion teasingly ran his tongue in circles around the pink nipples, causing them to perk up and harden lightly; the mare's cheeks blushing a bit from the soft pleasure, spreading her legs a bit wider to give her husband easier access. “So...udder play as well...” Twilight thought, watching that tongue expertly slurp over Cup Cake's nipples until they were fully perked up, before the stallion's lips wrapped around one, beginning to lightly suckle on it while his hoof stroked and massaged the other blue mound.

Gulping lightly, Twilight continued to watch and write, unable to help but become aroused from the sight, as most of the pairs she studied were both female, given the high female density in Ponyville. Biting her lower lip gently, she moved one hoof down between her own legs, lightly massaging over the two smaller mounds on her own crotch, the nipples already perked up from the cold air brushing along her skin-tight suit. “So...it seems udder and nipple play are quite popular among stallion and mare couples...” she thought, having noted that with the other stallion-mare pair she studied.

After a few more moments, she watched Carrot Cake slowly bring his head back up, licking his lips and grinning lustily toward the turquoise mare. Craning her head a bit, Twilight could see his stiffening member slightly, though she got a better view of it as the stallion moved up and laid on top of his wife, cuddling with her once more and pressing his lips against hers, while his hardening stallionhood pressed against the warm snatch below, rubbing along the moist folds as it continued to grow and stiffen even further.

“Mm, average size for a stallion...though I thought he'd be bigger, given his body size.” Twilight thought, blushing a bit deeper at her thoughts, while her hoof had moved down a bit further between her legs, lightly stroking over her own warm slit as her arousal continued to increase from watching the two ponies have their fun.

It wasn't long before Carrot Cake was fully hard, lightly moving his hips up and down to rub his lightly-throbbing member along Cup Cake's warm slit, teasing her with gentle pleasure as well as he continued to kiss her deeply for a little while longer. Pulling his head back, he slowly opened his eyes again, smiling lightly down at the blue mare, who lightly smiled back and nodded softly, bringing her hooves up and placing them on the stallion's shoulders.

“Ooh, here they go!” the voyeur unicorn thought with a mental grin, lightly licking her lips and continuing to stroke over her moistening slit through the latex, watching Carrot Cake position the tip of his shaft against his wife's entrance, giving a few more teasing rubs, before pushing his hips down and sinking the first few inches of his length inside; both of them closing their eyes and opening their mouths lightly to moan in pleasure.

“Mm, yeah...give it to her, Carrot Cake...” Twilight thought out loud, though only in a whisper, biting her lower lip gently as the notebook and quill dropped to the ground; her hoof pressing more firmly into the latex suit as it continued to rub firmly along her sex, pressing against her love button as well, sending shocks of pleasure through her loins.

The lusty unicorn watched as Carrot Cake steadily bucked his hips, sliding his member in and out of the mare's parted nether lips, slicking the shaft up nicely with her warm juices. The two kissed deeply once more while the stallion's thrusting gradually accelerated, the mix of his precum and his wife's juices making it easier for his member to slide in and out.

“Lots of kissing...another thing to be noted...” Twilight thought, though too absorbed in her clopping to pick up the notebook and write it down, panting lightly as her hoof continued to stroke firmly along her slit, greatly moistening up the latex around her crotch as her orgasm steadily built up.

As she kept her eyes glued to the couple, Carrot Cake suddenly pushed forward, sliding Cup Cake up against the headboard while simultaneously grabbing her legs, starting to make hard thrusts into her; their kiss breaking apart, leaving Carrot Cake panting and Cup Cake's mouth open a little wider from her blissful moaning. Her eyes rolled back a bit from the rough pounding, grasping onto the headboard to keep herself a bit more stable as her husband really put his back into it, slamming his crotch against hers with each powerful buck.

“Ooh, my, I didn't think such a skinny pony could be so strong!” Twilight thought, blushing deeply as she watched the rough pounding, though it only served to arouse her further, subconsciously rubbing herself even faster as she felt her orgasm approaching rapidly. She could see Carrot Cake's balls slapping against his wife's plump rear with each powerful thrust he gave, along with a trail of their love juices oozing down towards the mare's backdoor.

The unicorn wasn't the only one close to orgasm though; watching as the stallion gave a few more hard bucks before making one final thrust and leaning his head back along with Cup Cake, both of their mouths wide open and moaning in euphoria as they came. Carrot Cake's hips continued to thrust lightly through his orgasm, while the thick white seed escaped around his member, giving his wife a magnificent cream-pie.

The sight was too much for Twilight, who groaned in bliss and bit her lip firmly as she climaxed moments later, releasing a flood of her sexual juices all over her hoof and the suit, panting heavily and leaning back, falling over onto the ground. “Mmmnh, oh wow...who'd have thought Mr.Cake was so good to his wife in bed?” she thought with a slight giggle, taking a few moments to catch her breath before sitting back up again and glancing into the window.

The two lovers were now cuddled closely once more with their heads resting on the large center pillow; Carrot Cake still balls-deep though, enjoying the warmth of the mare's insides lightly squeezing his member. Twilight smiled a bit to the cute sight of the cuddling, picking up her notebook again and continuing to scribble notes across the pages with the quill. “Mm, so...somewhat more intimate than the non-married couples, with a bit more knowledge on each others' kinks.” she noted, before closing the notebook again and sliding the quill through the wire again.

As she turned around to leave though, she immediately found herself face-to-face with Pinkie, who was staring surprised-looking at her. “Wagh! Pinkie, what are you doing here?!” Twilight growled, having nearly jumped three feet back in surprise.

“You're just gonna leave? You're not gonna go in there and have some fun with them?” Pinkie asked, tilting her head to the side a bit. “C'mon Twilight, they're a ton of fun! I'm sure they'd love a third!” she added with a sensual smirk, getting a weirded-out look from Twilight.

“Pinkie, they looked like they were done, and about to go to sleep.” Twilight retorted, sighing a bit in annoyance. “And I need to go back home and do the same, if you don't mind.”

“Pfft. They were just getting warmed up. They're gonna be at it for most of the night!” Pinkie giggled, shaking her head a bit. “You sure you don't wanna, Twi?”

“No! Now if you'll excuse me, I need to be going.” Twilight huffed, groaning in annoyance as she trotted off toward her library, hoping that Pinkie wouldn't smell the small puddle of juices that she had left from her clopping.

Meanwhile, inside the Sugarcube Corner master bedroom, Carrot Cake had finally pulled out, sighing blissfully and rolling over onto his back, grinning a bit over at his wife. “You think we did good, honey bun?”

“Oh, sure. Knowing how much Twilight writes, I'm sure she wrote every little detail about us.” Cup Cake giggled a bit, rolling over and gently resting her head on her husband's chest. “That was certainly a good pounding from you though, darling...maybe we should do this more often, if it's going to drive you to buck me that hard.” she teased with a smirk.

Chuckling and shaking his head, Carrot Cake lightly stroked his hoof along Cup Cake's cheek. “Heheh...I'm gonna be sore in the morning, dear. I'm already feeling worn out as it is.” he replied, poking his tongue out playfully.

TEH EDN