Twilight Sparkle has a Magically Scientific Sex Change and has a Threesome with Big Macintosh and Rainbow Dash

by TheBigStallowski

First published

Uuugh here we go again. Twilight Sparkle invites Big Macintosh over to help with a scientific experiment. Unfortunately, due to Spike's sudden but inevitable demise at the hands of polio, the experiment goes wrong, and the two swap genders! Hilarity (and butt-buddiness) ensue!