Twilight is helping Rainbow Dash get ready for a "stallion party" with some of the Wonderbolts. When Twilight leaves Dash with a copy of the Tome of Sin and Vice, Dash accidentally puts some of her new stallion moves on her friends.

Single-chapter story focused on Rainbow Dash, Pinkie Pie, and Apple Jack, with a brief appearance by Twilight.

Warning: Clop-fic, gender-bending, and mild mind-control.