My (sadly failed for personal reasons) entry for the RariDash Four R's of Spring contest (link).
Rainbow Dash and Rarity have always been high-flying ponies, with big dreams and ambitions that they've finally managed to achieve through support from their friends - and from each other. Their relationship has bloomed from disinterest to friendship to romantic, and they've ridden the bumps along the way. But now it seems that with their jam-packed schedules and hectic careers they never get to spend any time together, and both secretly fear that their love is fading.
At first, Rainbow Dash's solution is simple. A week long vacation in a secluded lodge on the outskirts of a Caneighdian village, giving them time to relax and rekindle the fire that used to be so prominent in their relationship.
It turns out, this holiday will teach them more about themselves and each other than they could ever dream of.
A tale of love and determination, and quite a lot of crude humor and sex. As life goes.

Proofreading, editing and awesomeness provided by The Princess Rarity. You're a great friend, dear.
Cover art is by wizardglitter on deviantArt and is used with their permission.
Fitting and inspirational music for those of you who like to listen to music while reading: Forgive and Forget by You Me At Six.
A note on the universe:
While this is not an alternate universe the telephone has been invented by now and so the ponies do have mobile phones, or at least telephones in their houses.