A list of ideas

Uno) On a whim, Cloudchaser introduces Flitter to one of her sex toys after an interrupted masturbation session, resulting in her once tame sister spiraling into a kinkier, wilder sexual obsession.

Dos) Rainbow Dash and Rarity bodyswap, at Raritys challenge that Rainbow could not handle more than 2 weeks in her horseshoes, and vice-versa, both have trouble at first, but their minds begin to adapt to their new bodies, and find each others lives more endearing than their originals, and both agree to stretch their bet a little longer, as they both start settling to the idea of permanence with the swap.

Tres) Twilights Little Experiment: 2nd person anon is sent for living and study (and very fun interspecies sex) with Twilight after plopping down in Whitetail Woods for some irrelevent plot reason. Taking place only weeks after Trixies return, Twilight is obsessed with age spells, and has found a way for a pony who isn't augmented by magic or an alicorn to perform it, gradually decreasing her age in the span over a week, taking notes and enjoying sex as things become tighter and smaller until she's a young filly (retaining her intellect though)

Catorce) The Queen of Courtship: Not satisfied with just the age spell she's mastered, Twilight sets about using the same process to swap her gender as well, excited about the results and a chance to personally examine stallion anatomy without worrying about awkwardness. Rarity and Applejack catch wind of the experiment, and after a long conversation and bragging, the two ponies challenge each other to see who could woo the now masculine Twilight with their feminine charms, and _____ (depending on who wins) achieves their victory, continues to string Twilight along until the point of no return, and is enthusiastically rutted by the newly male unicorn.

Cinco) Scootaloo x Rainbow Dash adult humanized

Seis) 2nd person anon x Babs adult humanized. Big, Busty, and in charge of you in bed, a shortfic with lots of sex

Siete) Soarin' Spitfire punish Lightning Dust more thoroughly for her failures in the showers after hours in the Wonderbolts acadamy. Punishment, spanking, humiliation strong themes, and even though Lightning Dust refuses to break and fly away from the pair as they lick, suck and fuck every one of her holes with the promise of a second chance (there are no second chances)