Luna was a total pedo so when she got moon’d Celestia reacted badly to pedo stuff and instituted strict ages of consent and parental control. She was afraid on some level that Luna’s descent had to do with her inclinations towards foals, and was determined not to let something terrible like that ever happen again. She mellowed out in the centuries that followed but society didn’t follow suit, taking Celestia’s old teachings as the (literal) Word of God and slowly but surely getting more strict about them, pushing age of consent back, and abandoning traditional contraceptives for heat blocking things like Moon Tea, the ancient pharmaceutical art kept alive only in the distant Zebra lands. And Celestia might have mellowed out, but she wasn’t exactly objecting to it. It looks good on the surface after all, a bunch of smiling fillies all living innocent idyllic lives. The burdens of knowledge can never be lifted, so you want to hold out as long as you can so that they get the full experience of a life without it before they have to take part in it to satisfy their urges.
Height of it was the generation before Granny Smith, where they actually started having pedofoal burnings and punishing sexual fillies (not colts ofc) as adults. Celestia had to step in then, and as is her modus operandi instituted strict controls on protecting fillies and banning the death penalty, and emphasizing rehabilitation over punishment. Dismantled the jail system, brought about an era of unforseen peace and freedom, into which Granny was born. But doing nothing to undo the underlying reasons for that extreme behavior, leaving parents to protect their foals from the imagined dangers of immature and intergenerational sex, without preparing them for the sex in the first place. Granny herself got pregnant at a young age, and the resulting abortion practically forced on her just made her more incensed about the dangers involved. Her own child grew up to full maturity without having once touched a stallion, then got together with an Orange as was prearranged for breeding purposes and began an idyllic family relationship. Then died horribly in an accident.
As Granny’s getting older she’s starting to see the terrible toll her sort of attitude is taking on the next generation and is reconsidering her lifestyle really. The straight line don’t seem nearly as straight after you’ve seen three hundred years of its twisted and crooken nature. But what she taught her daughter, and what her daughter’s husband taught their kids is sticking strongly. In particular Big Macintosh is a downright prude, much to Applejack’s relief/dismay. Yes this was inspired by this.
And Luna’s been picking up on this ever since she got back, and teasing Celestia ever so subtly about it
...
Dinky herself. You wouldn’t think Dinky had a care in her head until you talked to her. She was so good at smiling in this innocently happy expression, but Apple Bloom was a bit taken aback by her serious nature. Dinky wasn’t a clone of Twilight Sparkle, Apple Bloom was... pretty sure, but maybe it’s a unicorn thing? No that would apply to Sweetie Belle too.
...
Pegasi alone lay eggs. Earth ponies and unicorns give live birth. Explanation being that except with pegasi, the egg stays inside the whole time. Amniotic sac = proto-pegasus-egg. Also pegasus eggs can be placed on clouds safely. Allows female pegasi to be more active/athletic and smaller w/out risking the infants.
...
Scootaloo didn’t know why she was so tiny, but she really hoped she would have a growth spurt or something.
...
“You knew?!”
“Come now, dear. You invite a colt over for studying, and then you actually are studying? Without quenching the fires, so to speak?”
“It is kinda obvious,” Dipsy said, with an embarrassed smile.
“But... but.. it’s okay?”
“Dinky, there comes a time in every mother’s life,” Dipsy said elaborately, “When she has to accept that her fillies are ready for that sort of thing and can start letting colts into their lives, and that time is estrus.” She stopped, then added, “It’s pretty easy to tell.”
“So, you mean if... you want, I can have colts over?”
“I don’t mind,” said Dipsy, moving slyly towards Turner. “As long as you don’t mind when I do this” and she swept him into her embrace, kissing him full on, tenderly.
Dinky’s face twisted and she was about to say ewwww but then it occurred to her that what she did had been a lot grosser and slimier than some dumb old kiss. She’d never been into gross stuff before, but she guessed if it was going to be that much fun for her, then she really didn’t have a problem with her parents doing it after all.
“You need to make some friends who are colts,” Turner advised her. “Friends who like you as much as you like them. If they are friends, then you can most certainly bring them over!” A thought occurred to him and he added somewhat suggestively, “You and Archer should bring that nice Apple colt over again for some more studying.”
Dinky blushed so hard she thought she was gonna die.
...
Fluttershy shows Apple Bloom her foal pictures, where she looks just as slender and freakish as Featherweight, indicating he’s going to have the body of a fashion model.
...
“I don’t see why you’re so upset about this. You could have ended this any time you wanted to. I knew I was going to be otherwise... indisposed the following week. That’s why all you had to do was say the word and I’d put everything back to normal.”
“I been telling you to put me back to normal all week, you goddamn liar!”
“But you didn’t say the word.”
“...”
“...:3”
“What. Word.”
“Exianthofolus. What, I never told you? So sorry, it must have slipped my mind.”
“Just turn me back into a filly already!”
...
And so Twilight Sparkle began to laugh, thus validating Pinkie Pie’s amazing laughter powers. Sure her... eyes were going in different directions, but it still counted. Pinkie Pie did not judge.
...
Scootaloo learns that she was abandoned by the way the other homeless kids tease her mercilessly about how pegasi foals who can’t fly are just abandoned on the ground to die.
—
Rainbow Dash got her father sent to prison because she was being a total slut and they found out and he got canned for being a pedo. She and Scoots visit at some point.
—
“I just want you to keep in mind little filly, that it wasn’t my powers that took away your talent.
—
In awe and amazement, she stared at the throbbing spurting secret hidden inside Scootaloo’s smooth orange abdomen. It didn’t even look like Apple Bloom was doing anything in there. But she did! And she did! And she did again! And she did and it finally showed, a thick white fluid dribbling from Scootaloo’s stretched entrance where Apple Bloom’s cock was embedded. And she did again! And one more good squirt and her dick was just throbbing now, pulsing in gentle aftershocks against Scootaloo’s drenched walls.
—
Archer comes from an affluent family but is horribly self conscious about it. Scootaloo hides her homelessness to avoid Archer feeling bad about it.
No no no, Archer and Scootaloo were both mistreated underfed orphans, and Archer got adopted into an affluent family, and Scootaloo ran away, to be with her friend and b/c orphanage sux.