Mirror Cadance 1.5. (Patreon)

 So Mirror Cadance was unable to change further after 1.0. Her own lock was, well, a lock for her. She stayed 1.0 for a pretty long time, and even Granny's bimbo apples didn't change her. All the excess magic got stored away in the lock.

However, one day, Thorax brings one of Chrysalis' Changelings to Cadance to gain favors with her and help her build out some steam. Cadance loves to have an innocent gal squirm under her, in this case the changeling Free Love.

However the love filled magic from Chrysalis was getting into contact with Cadance. It was ''the key'' to unlock her bimbo artifact, and all that stored magic was now able to seep through to her and the one she's molding. She's pretty much turning the changedlings into her own wing- and tailless succubi and incubi.

The scene after this Cadance chains Free Love having the new horny changed bimbo watch as Cadance Rewards Thorax for helping her change further.