Author's Note

At the request of Undead Man, I have added a bonus chapter where Flurry goes to her big step-sister Molly and asks how she can get in on the action with Shining Armor! Enjoy :)

Bonus Chapter: Seduction Instruction

Years had passed with Molly as the newest member of the royal family of the Crystal Empire, Molly wasn't a princess because despite being Shining Armor and Cadance's daughter in a legal sense, the law also stipulated that only those of a royal bloodline or lineage could be regarded as royalty. Molly's parents had offered to get the law changed but Molly insisted that she was happy to just be herself and not be "Princess Molly" instead. Not much changed as time went on, Shining Armor and Cadance continued with their royal duties, Molly still liked to go shopping every now and then and of course, she was still having regular sex with her adopted father, Shining Armor. Shining Armor was glad that his wife Cadance had been so encouraging of this rather taboo relationship and also considered himself lucky that Cadance herself was still having regular sex with him, the amount of action he was getting was almost tiring!

The one thing that did change however, was Flurry. Aside from getting older, more mature and filling out rather nicely, she came to the realization that her mother was obviously having sex with her father, her step-sister Molly was having sex with her father...... so why wasn't she, herself, also having sex with her own father? It was around the age of fifteen that she came upon the conclusion that having sex with her dad wasn't just a matter of being included in a "family activity", she did actually think her father was rather dashing and that when she was legal, she'd definitely want her dad to the be the kind of stallion to give her her first good rutting... and maybe a few hard ruttings after that just for fun... for a few decades.

Flurry was nothing but patient with her desire and though she did often find herself listening to her dad having sex through the wall, watching through a crack in the door or even living out a little fantasy when masturbating, she never acted upon it until she hit the age of nineteen. However, she didn't wanna just walk up to her dad and say "Hey, let's fuck", she wanted advice first, so she went to the only one who had managed to seduce the stallion, Molly. Molly was in her bed room reading "Fifty Shades of Neigh" and when Flurry walked in she smiled and said "Hey! What's up little sis?"

Flurry Heart returned the smile and went "Oh not much, say, do you have a second? I wanna ask you something"

Molly put her book down and said "Sure go ahead, shoot"

Flurry, with not a hint of embarrassment, simply asked "Sis, how did you seduce dad?"

Molly smirked and went "Interested huh? I was wondering when you were gonna go for it. Well, to tell you the truth sis, I didn't actually mean to seduce him, it just happened. The thing that probably triggered it was my choice of clothing but the stuff I wear is for those who walk on two legs, though I'm assuming there is a pony equivalent, I can't be sure because I don't really go in any pony clothing shops, so you'll have to find out about that one. Other than that, he just kinda liked the way I look, you certainly take after mom so you shouldn't need to worry about that. Oh also, make sure that when dad figures out what you're up to that you have all the answers, dad is likely gonna come up with some bullshit reasons why he shouldn't fuck you and you need to be able to answer every question so that he has no excuse not to. If all else fails, then as a last resort you'll have to use some light emotional blackmail, make it seem like you're upset about it or something, in a believable way of course. That's as best advice I can give you, the thing between me and dad just sorta happened so I don't have a step-by-step guide, you just gotta feel your way through it I guess"

Flurry soaked in every word and nodded before going "OK, I think I can pull that off, thanks sis!"

Molly picked her book back up and said "Anytime" as Flurry galloped off to remove her royal regalia and go for something a little more provocative, she didn't wanna waste any more time on getting her dad into bed and having some sexy fun. Flurry decided to go for some jean shorts that were just the tiniest bit too small to accentuate her rump, it was a well known fact that for some unknown reason, alicorn princesses were genetically predisposed to develop larger than average backsides as soon as they hit adolescence and Flurry was no exception, most ponies considered themselves lucky if they were packing half as much fat in their hindquarters than the princesses did. Flurry had decided on jean shorts because although a skirt would have shown off and drawn attention to her butt, ponies walked about naked all the time, so she figured that wearing something that actually covered her most outstanding feature was that little bit naughtier and suggestive.

When she felt ready, Flurry picked up a quill in her magic and scribbled a message on a piece of parchment before zapping it away, it was seconds later that Shining Armor, while speaking to a guard about future perimeter checks, received the very same parchment. Shining Armor wasn't expecting any messages, nevertheless, he dismissed the guards and picked up the parchment in his magic before unfurling it, all it said was "Please come to my bed room father, Flurry"

Shining Armor shrugged, seeing no reason not to do as Flurry asked and headed to her bed room, though what he saw when he got there was slightly unexpected. Flurry was sat on her bed, facing away from him to make sure that the first thing he saw was her fat ass squeezed into the jean shorts she had picked out, Flurry looked over her shoulder and smirked, waving her hips from side to side hypnotically as she said "Hey dad, see something you like?"

Shining followed the movement with his eyes as if in a trance, becoming fully erect before shaking his head and going "Flurry... are you trying to seduce me? I mean, that seems like a silly question all things considered but still! Are you?"

Flurry went "Well, what if I am?"

Shining Armor chuckled and went "Well, I can't exactly say it's a surprise and I can't say that I wouldn't do it either, however the main issue here isn't the law, it's genetics, having sex with you would come with... well, complications"

Flurry nodded and said "That's true if you're strictly speaking in terms of having a foal, so what if I were to tell you that I've placed a magical seal on my cervix? You could pump fifty loads into me and there's no way I'd become pregnant at all"

Shining Armor thought about it for a moment, then grinned as he went "Get out of those shorts now, daddy's coming in"

Flurry magically tugged her jean shorts down and went "Well I certainly hope so! No better place for baby cream than inside my tight and moist little filly folds, though I'm no filly, I'm a full-grown and horny mare, hungry for daddy's cock..."

Shining trotted over and got onto the bed, hooking his forelegs over Flurry's shoulders as he mounted her, fully prepared to start having multiple sex sessions with his wife and both of his daughters. Shining shuffled around, aimlessly humping at the air until he located Flurry's twitching cunt and angled himself appropriately so that when he pushed forward, his cock would find purchase and slide in rather than going off course and failing to penetrate. Shining tightened his grip and heaved his hips forward, he knew Flurry was going to be tight because of their relative size difference, something that Flurry also seemed to be aware of considering she was pushing back to aid in his effort to gain access and enter her.

Flurry breathed heavily and encouraged her father to persevere by whispering in a husky tone of voice "That's it daddy, just keep going and I promise your patience will pay off, you're almost in, I can feel my pussy lips stretching to accommodate you... you can do it, fuck your daughter, let me milk and soothe your aching boner with my baby chamber"

Flurry's dirty talking only made him more eager to claim her and after a few more seconds of effort, a good inch of his cock finally sank into Flurry's moist depths. They both relaxed, panting and sweaty already as they took a moment to enjoy their first blissful union of flesh before Shining began to delve deeper, easing inch after inch of his turgid fuck pole into his daughter's quivering cunny until his medial ring pressed against her sex and prevented him from going any further in.

Flurry whimpered the entire time, the unbelievable feeling of being so completely filled made her forget all semblance of attempting to talk, something that was only exacerbated when her father started to actually thrust in and out. Shining wasn't gentle in the slightest, his first time with Molly had been soft because it was born out of a mutual feeling of love and while he loved Flurry and Flurry loved him in exactly the same way, this particular sex session had been born out of lust. The bed creaked as Shining kept pounding away at Flurry, his large swinging balls churning as they prepared a hot and thick load for him to blow into his daughter. Flurry let out a moan, her eyes crossing and her drooling tongue hanging from her open mouth as she creamed harder than ever before, the orgasm was so intense that small sparks flew from her horn.

The way Flurry's walls tensed and rippled around Shining's length brought him to his own climax, his head flared as he shouted "Oh fuck, baby I'm cumming!

Finally finding the strength to speak, Flurry practically roared one single word "INSIDE! INSIIIDE!!! INSIIIIIDE!!!!! INSIIIIIIIIDE!!!!!!"

Shining rammed himself home as a deluge of spunk blasted out of his tip, groaning as his balls completely emptied themselves inside her and, as she had said, not a single drop went past her cervix. There was a good few minutes of nothing but heavy breathing, when things were silent a voice suddenly went "Flurry? Are you alright? I thought I heard screaming, can I come in?"

Shining called back to his wife "Don't worry darling, I've just fucked her brains out, it's all good"

Cadance went "Ugh, about time! Took you long enough! Alright, enjoy your afterglow!"

The End