Princess Twilight Sparkle finds herself in a peculiar situation this Hearts and Hooves Day. Four ponies each seek to be her special somepony. And it is up to her to choose. So she does it using the best method she knows: SCIENCE!
But as the tryouts commence, they begin to realize: "This castle ain't big enough for the five of us."

Warning: Contains shipping beyond all reason, and Trixie being inconvenient.