Futa Cadence x Gleaming Shield (Multiple Chapters)

or

Latex Spitfire 'tortured' (loosely using the term) by the Shadowbolts. (Multi-Chapters)
(Basically based on KRDs universe and images where she's mean to Spitfire😂🤣)

or

Evil Spitfire (Humiliation, Human in Equestria.)

????????

Here have some Best Pony.