Being moved from her cell in the dungeon, Rainbow Dash comes face to face with the Storm King who plans on making the captive mare his new plaything. But not through a forceful means such as magic, hypnotism, or brainwashing, but through Rainbow's own willingness to prove she's the best in anything and everything she participates in. Even if the bet is focused on intercourse, this story was a request by fellow fimfic user ShadowStorm7.

Fetish warning: contains hyper cock, stomach bulge, excessive cum, minor incest, body transformation, and some minor physical harm in the name of comedy.