In order for Trixie to be accepted to Celestia's School for Gifted Unicorns, she must first pass a rigorous exam administered by Celestia herself. Luckily Twilight is there to help.

A lonely—and somewhat horny—Trixie decides to indulge in one of her favorite pastimes, screwing a doll that looks like Twilight. Before she can finish though, she's interrupted by the last pony she expects.

Celestia convinces Twilight to wear a banana costume for her amusement... then realizes she likes it a bit more than she expected. Soon they're rolling around on the floor making sweet banana splits.