Fluttershy approached Twilight and asked if she knew any spells to increase muscle mass... but only a little! She just wanted to feel a little stronger and to have more self-confident in herself and to surprise her very special some-human girlfriend.

Twilight finds an ancient spell capable of granting super strength but only during sex with her human girlfriend. She gives it a whirl on Fluttershy, only to discover just how much super strength the spell grants... and Fluttershy wonders when (if ever) the spell will stop...

~~~