~A simple tale told through the format of letters~

It's just a date, right? What could possibly go wrong? But when the scientifically-minded Twilight Sparkle deems it necessary to start writing letters to Pinkie Pie about it, bad approaches lead to misunderstood intentions, and it's up to Twilight to solve the problem herself.

The cutie mark crusaders are trying to get their cutie marks, but they have ran out of ideas. One day, the CMC saw Twilight Sparkle and Pinkie Pie walking together in ponyville, and all of a sudden they had an idea.
Disclaimer: IF YOU DON'T SHIP TWIPIE (Twilight Sparkle x Pinkie Pie) THEN I SUGGEST NOT READING THIS.

Pinkie Pie goes to Twilight's library in search of a solution to a problem that she has been having

On the day just after her coronation, Princess Twilight Sparkle runs into Pinkie Pie.

Twilight loves all her friends, but lately a certain pink pony has been occupying her mind a bit more than usual: thankfully, she knows to keep such feelings to herself.

...So why has that mare been giggling everytime she passes by?

Pinkie Pie preemptively apologizes to Twilight: she's going to ruin their friendship.

Twilight agrees.

Pinkie suits her better as a girlfriend anyway.

It's late at night, and something wakes Twilight from her much needed rest. After a quick investigation she discovers one of her prized possesions comepletly destroyed. She has an idea about who was responsible, but now the question is; how exactly is she going to punish them?

For the past month, Twilight and Pinkie have been holding nightly study sessions, where they have the chance to sit around, eat lemon cake, and ponder the mysteries of the universe. Never before has Twilight had such an attentive student—and never before has she felt this warmth in her chest whenever she looks at Pinkie.

One night while studying, Pinkie lets slip that she's not just studying for herself, but to impress another mare. When Twilight starts to press her on who that mare is, however... things take a turn for the intimate.

Originally written for the Writeoff Association's October contest, Illusion of Choice, in which it made finals. Thanks to MuffinName for the cover art. Thanks to Titanium Dragon, Trick Question, and PaulAsaran for providing criticism on the original version.

Pinkie stalked Twilight all afternoon. Now she's wondering why there's these sounds coming from the Alicorn's bathroom.
These very familiar sounds.
Very erotic sounds.
Almost sounds like she's masturbating.
Wait...
GASP

Can I just re-brand a story completely like this?

Tagged Sex for sexual humor.

Twilight is bored, sitting alone in her castle, and contemplating what to do with her day, when Pinkie shows up with a surprise.