Twilight's horn would always ache just a bit after performing big spells, or too many at once, but after the battle with Tirek, it hurt worse than usual. Rarity was stopping by with a few books that Twilight had let her borrow that included information about how to get the stitching on her outfits perfectly, even if it was nearly perfect already. She noticed that her alicorn friend was troubled by something, and once Twilight told her, Rarity spoke of how she would run into similar problems after creating an entire line of clothing in one night, or day, and showed Twilight a technique she discovered to help soothe her horn.

Twilight didn't see this coming, but she isn't complaining.

She's really not complaining


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Okay, there's not technically intercourse, but there's horn intercourse?