Aloe offers a certain service to two of her regular customers and unknowingly sets a very sexy series of events off that will change everything Fluttershy and Rarity think of each other.
Fluttershy isn't exactly sure what a Happy Ending was but she did have an idea.
If it is what she thinks it is, she decides this is the perfect opportunity to express herself and break her own timidness that stops her from having what she wants most.