Twilight Sparkle has taught Starlight more friendship lessons than she can remember, and she's extremely proud of her student. But in some ways, she's jealous. Fluttershy, being the only sober mare within earshot, is unfortunately about to discover just how jealous.

Maybe Equestria will still be standing when all is said and done.

Art by Pirill
Sex tag for discussion of sex lives (or lack thereof) and general innuendo.