Twilight huddles naked in the cover of some rocks by an unoccupied part of the lake, doing the best to cover herself with her hands and hunching over, but her cock is making it very hard with it sticking up like a flagpole.

“This is the worst...” Twilight whimpered, shivering as a slight breeze blows past.

She made the amateur mistake of teleporting without her clothes, so now she is left to hide naked among the rocks until she can muster the strength to teleport back home. But she’s now endanger of being discovered, and if somepony sees her like this... well it could be pretty bad.

Her cock also won’t settle down and her breasts are still tingling from Libi’s treatment of them, making sure Twilight won’t be getting soft anytime soon.

“If only I had my bikini…” Twilight says, wishfully and regretfully.

Suddenly something soft lands on her head, she reaches up and pulls off whatever fell. It’s her bikini! She looks up and sees Libi sitting up on the rock where Twilight has been hiding behind.

“What a sorry sight you are,” notes Libi, looking down at her. Libi is still naked.

“And who’s fault is that!?” Twilight snaps, checking to make sure her bikini is alright.

“No idea,” Libi replies, sliding down the rock next to Twilight.

Twilight looks beside her at the tempting demon’s naked body now beside, her cock going rock hard again.

“Do you have to be naked?” Twilight asks, tearing her eyes away.

“I’m at the beach aren’t I?” Libi says, smiling, “I can’t wear my usual attire.”

“But what about a swimsuit?” Twilight asks, sneaking a peak again.

“Don’t have any, also don’t you think that going naked is the more lust demon thing to do? To tempt their masters into more sex,” Libi says, press her breasts together with her arms, making them more prominent.

“Are you trying to tempt me?” Twilight asks, staring at her breasts. ‘Cause it’s working…’ she thinks to herself.

“Maybe,” Libi says, smirking, while turning around and leaning against the rock, sticking her butt up into the air, “What happens next is all up to you…”

Twilight stares at the leaned over figure and looking directly at her dripping pussy, she isn’t sure if it is water or… you know. Her cock throbs wanting to plow the demon, but ponies are nearby and could see her. Libi moves a hand down to pussy and parts her black lips, giving Twilight a clearer view.

“So what are you going to do Twilight?” Libi taunts, swaying her butt in a almost mesmerizing way, “Are you going to fuck your demon, or go back to your friends with that huge stiffy? Oh, I almost forgot, your friends are looking for you as well.”

‘This is not fair!’ Twilight thinks, her cock is so hard that it’s painful, she needs release! But if what Libi says is true, her friends are looking for her and might find her, so she should get dress and leave… but she wants her to have sex with Libi!!

Eventually instinct wins, she needs to fuck something otherwise she’ll go insane! She stands up and roughly grabs Libi’s hips, hastily positioning her dick behind Libi. But in her haste, she accidentally lines it up with the wrong hole.

“Wait Twilight!” Libi yells, shocked as Twilight’s cockhead starts pushing against her arsehole, “That’s my EEEEEK!!” Libi lets out a squeal as Twilight's head suddenly forces its way past her sphincter and into her tight arsehole.

“So tight…” groans Twilight, still not realizing that it’s Libi’s arsehole, “It feels amazing and hot, like it trying to burn off my dick!” It also seems to be trying to dislodge her, so Twilight pushes harder, forcing inch after inch into Libi.

“Nooooo…” Libi moans loudly, her legs trembling. She wasn’t ready for anal penetration. Normally this wouldn’t be a problem, but Twilight is fucking huge and then there is that something else she has, which forcing Libi to feel Twilight’s pleasure which enhances her own.

Pretty soon Twilight hits something, stopping her from getting deeper. It’s Libi’s belly.

‘This is odd,’ Twilight thinks, still thinking this is Libi’s pussy as she knocks her cock head against the resistance, causing it to yield slightly and making Libi let out a whimpering moan, ‘Libi’s pussy can usually take a lot more before I reach her womb?’ Twilight looks down and is shocked to see that her cock is actually stuffed in Libi’s now stretched arsehole. “Oh Celestia!! I’m in your butt!”

“Nice of you to notice!” Libi yells, having trouble standing now, “It feels like a tree trunk it stuffed up my arse!”

Twilight’s surprised to see the demon distress face, it’s not something she’s ever seen before. Can’t she deal with it in the butt? Twilight is pretty sure doing it in the butt is an actual sexual practice, she thinks it’s called anal.

“Hey,” Twilight asks, moving her head near Libi’s, while trying to force more of her dick in, making Libi let out a loud moan, “Is your butt your weak spot?”

“Don’t get full of yourself!” Libi says, having more trouble standing, “I just wasn't ready for it…”

“So you have to be ready for a type of sex otherwise you’re more sensitive? Interesting...” Twilight says, pushing in another inch, making Libi moan again.

“Ok, you’ve had your fun, please pull out! I’m not ready for anal with you yet!” Libi begs, starting to pant as her legs quiver.

“Hmmm, no!” Twilight says, grinning, shoving more of her cock in, earning squeal from Libi, “I kind of like having the edge for once!”

Twilight notices that Libi belly is stretching outwards to accommodate more of her dick, she guesses that lust demons butts don’t have that extra length that lust demon’s pussy do.

“No, don’t…” Libi whimpers, half of Twilight’s 20 inch cock buried into her arse, “I’ll go insane!”

“That’ll be a nice for a change,” Twilight notes, pushing another five inches into Libi, making Libi whimper, “MMMM, your butt feels amazing, like my cock is going to melt.”

“Please, no more,” Libi whimpers, looking down at her belly, which is nearly up to her face.

Ignoring Libi whimpers, Twilight pushes in the last five inches of her cock, earning a final whimper from Libi.

“At last!” Twilight sighs happily, since now both her and Libi’s hips are joined and her cock is fully in Libi. She looks over Libi’s shoulder and can see her cock shape defined in Libi’s bulging stomach, while inside her dick is being squeezed hard by Libi’s arse.

“Oh abyss, I feel like a thick broom is up my arse,” Libi moans, her legs shaking like she’s about to fall.

Smirking, Twilight grabs tightly onto Libi hips and quickly removes a few inches before slamming them back in again, earning a surprised gasp from Libi. Twilight starts to thrust, earning loud moans from both of them. Libi arse really does feel amazing and just as good as Libi’s pussy. With every thrust Libi’s walls clamp down squeezing Twilight’s dick in a oh so pleasant way, and rubbing tightly against her dick, making Twilight want to thrust harder to feel more of it.

Libi moans up a storm, with every inward and outward thrust earning a loud moan. Her legs are now unable to hold her up anymore so she relies on Twilight’s hand and cock stuffed belly to support her as she leans on the rock, moaning. She feels like she has orgasmed multiple times in the last few minutes.

“Twilight please slow down!” Libi moans, as another orgasm rocks her, “If I continue to cum like this, I’ll really go insane!!”

“No way, this feels great!!” Twilight yells happily, forgetting that they are in public place, while she begins to thrust as hardest she can, “I think I’m going to cum soon.”

“Oh noooo,” Libi moans, she herself, cumming again.

“Cumming!” Twilight declares, before she thrust everything in and blowing her load, spraying directly inside Libi, filling her guts and making her belly swell with semen until she looks pregnant.

“No more Twilight, no more,” Libi pants, holding a hand over her mouth as Twilight finishes cumming, “If you cum like that again I’ll throw it up!”

“But I don’t wanna stop,” Twilight pouts like filly, rapidly thrusting her hips again.

“Oh shit…” Libi says, before covering her mouth again to stop some of the cum coming out.

‘Celestia this feels amazing!’ Twilight thinks, as she listens to Libi muffled moans while she ravages her arsehole, ‘This almost makes me rethink the idea of removing my dick, oh well I bet it feels just as good receiving... right?’

‘Lust demons are truly made for sex,’ is Twilight’s current thought, Libi’s arsehole seems to have a life of its own, tightening at the right places at the right time, seemly without any directive from Libi, and just like whenever Twilight gets into having sex with Libi, she dreads the end. She’s definitely become a pervert. With that in mind, Twilight is about to cum again.

Twilight lets out a relieved sigh as she cums again, spraying another gigantic load into Libi’s already cum stuffed guts. Libi groans as her guts swell further, pushing Libi off the rock and totally hiding the shape of Twilight’s dick in her belly. But it seems Twilight has almost reached Libi stomach’s limits, and her cheeks bulge with cum, she tries to hold it back with her hands but it just sprays out of her nose, before she gives up and lets the escaping cum flood out of her mouth and into her swollen belly, covering it.

Soon Twilight’s orgasm finished, and satisfied she removes her cock and falls onto the ground panting, while Libi slips onto the ground, the stored cum spraying out her stretched arsehole, forming a puddle on the ground.

‘That was amazing!’ Twilight thinks, although having sex with Libi is always amazing, it was just to be in total control and having Libi at her mercy felt fantastic, she’s never felt so aroused in her life and wants to do it again, but her hips are now killing her, ‘Maybe I’m a dom?’

“I hope you enjoyed that…” Libi says, annoyance clear in her voice as she stands up on shaky legs.

Her belly seems a whole lot smaller now, almost normal beside a small bulge, and some cum still leaked out of her slightly gaping arsehole. Her her legs are totally covered in Twilight’s cum, and the same goes for her chest, belly and mouth. Twilight does her best to remember this, since she thinks it is going to play in her mind a lot.

“I did, it was amazing!” Twilight answers, as she tries to stand up.

“Good for you, now I got to clean myself up,” Libi says, sighing, “I stink of cum, I suggest you do the same.”

Libi disappears again leaving Twilight alone. Twilight sniff herself, yep she stinks of sex and cum. Quickly putting on her bathing suits, she slips into the water to try and wash off the smell, once she’s satisfied she head back to her friends, who are still looking for her.

Author's Note

Another chapter, another step closer to completion.
Next chapter more plot, and not the sexy kind.