Image imported from derpibooru 
Original Description:
 
For such a large stallion now turned mare via Rule 63 magic, Fast Hooves sure has shaped out rather nicely. The fusion of both Troubleshoes Clyde and Flash Sentry creating a rather proportioned and well rounded mare whom in this case is seen fitting a swimsuit of her size rather well. From the looks of it it seems like it also isn’t his first rodeo being gender swapped via magic. Might have learned a few poses or two from his lover Princess Morning Star (Twilight x Celestia)
 
Once more done by the awesome panda-man90
 
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