Redheart, Canterlot High's former nurse, has taken up her new job as an FBI agent and a...well, she doesn't quite know. Sunset Shimmer, newly graduated, is her partner and occasionally likes to use an Equestrian potion to grow a dick. Together, aided by their faithful sexy secretary administrative assistant and Sunset's very-not-exclusive girlfriend, Sonata Dusk, they track Canterlot's magical denizens and make sure they're no threat to humanity. Ideally non-lethally.

They end up having sex with a whole lot of them.

Reading Senior Year Ponies Up probably not strictly necessary, but I do suggest at least reading the epilogue. If you haven't read the rest of the universe, know it branched off from canon after S4/Rainbow Rocks.

Contains: Magically enhanced Redheart. Dick-wielding Sunset Shimmer. Weird creatures, some borrowed (hence the crossover tag). Weird transformations. Weird sex involving both. Lots of cum everywhere but especially inside hot, ready bodies. The usual occasional impregnation fetishism and actual impregnation. Unrealistic lack of dire consequences for all of the above. As usual, chapter-specific warnings as warranted. All characters are at least 18, mature, and capable of making informed decisions to the standards of their creature type.